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11
Welcomeâ€Ļ..........
“Effectiveness of pillow irrigation in water use efficiency
and crop yield”
Course Teacher
Dr. Nimichandrappa
Guided By
Dr. B. S. Polisegowdar
Presented By
Sweta
ID NO. PG14AEG6117
M. Tech (Soil and Water conservation engineering)
College of agricultural engineering,
University of agricultural sciences Raichur.
DirectoryDirectory
33
PREFACEPREFACE
Rapid increase in the population and demand on food have led us to
produce more food this off course, has led us to use water more
efficiently and economically.
Irrigation is a major important factor as compared to other factors
like tillage, seed and pest management.
Water is basic resource for sustainable agriculture.
Improved water management methods are all ways on demand.
44
Surface irrigation is the most commonly used method as over 95% of
irrigation is done by surface irrigation but in recent years there is
rapid increase in the pressurized irrigation and with mulch
application.
Researchers have developed many irrigation method as alter furrow
and surge flow to improve the irrigation efficiency.
Same way the water pillow irrigation is one of the latest and best
method of irrigation to increase the water use efficiency.
55
Water pillow irrigationWater pillow irrigation
66
īŽ Drip irrigation, the use of mulching provides many
advantages, (Tiwari et al., 2003; Antony and 2004;
Ramakrishna et al., 2006).
īŽ The water pillow (WP) is a new irrigation method that
combines drip irrigation and mulch, offers a number of unique
opportunities to save water .(Sinan, G., 2006).
water pillow
++ ==
Water pillow
HistoryHistory
īŽ Over 40 yrs back the flex tanks and fuel bladder are used to
store the liquids.
īŽ Ist
fileld study was conducted in 2003 & 2004 growing season
at the university of Harren, Agricultural Research station
sanliurfa, Turkey.
77
Crop suitabilityCrop suitability
īŽ Water pillow irrigation is applied ideally and economically at the
green houses and flat areas.
īŽ Crops suitable- Soyabean(edamame;Glycine max.),
Pepper(capsicum annuum L.), Eggplant, Cotton(malvaceae) and
Maize(zeamays).
componentscomponents
1. Laterals1. Laterals
2. A portable polyethylene plastic pipe with 0.30mm in thick.2. A portable polyethylene plastic pipe with 0.30mm in thick.
Diameter of the pipe should almost cover the row spacing.Diameter of the pipe should almost cover the row spacing.
Plastic pipe should be usable for 2 years.Plastic pipe should be usable for 2 years.
ConstructionsConstructions
īŽ Plastic pipe hole is pierced along the bottom with hole ~ 1mm.
īŽ The design and interspacing of the holes depends on the soil
infiltration capacity, soil type and crops.
īŽ After filling the water both the ends are blocked by tying rope.
Preparation of land before irrigationâ€Ļ.Preparation of land before irrigationâ€Ļ.
Before irrigation land should be levelled, soil surface must beBefore irrigation land should be levelled, soil surface must be
cleared of sharp material like crop residuals and stones, this maycleared of sharp material like crop residuals and stones, this may
helps to achieve uniform water distribution in the soil.helps to achieve uniform water distribution in the soil.
Plastic pipe is laid out in the row from sowing to harvest it acts asPlastic pipe is laid out in the row from sowing to harvest it acts as
mulch.mulch.
Black plastic is usually used to reduce the evaporation loss orBlack plastic is usually used to reduce the evaporation loss or
erosion from the soil surface and controls the weed.erosion from the soil surface and controls the weed.
1111
Workingâ€Ļ. Of water pillow irrigationâ€Ļ.Workingâ€Ļ. Of water pillow irrigationâ€Ļ.
For irrigation operation water is delivered to each plastic pipe
through laterals.
It need not need any external system of energy as compared to
pressurized irrigation system.
Water trickles from the plastic pipe with gravity and then infiltrates
in to the soil as it does in drip irrigation system.
īŽ Filling
Filing time is short.
Ex- a plastic pipe 0.40m in dia.
Is filled up fully in 14min.
With a 15ls-1
īŽ Trickling
Trickling time is long.
Ex- whole event is could be
completed in 24hrs. Generally
with speed of 0.001ls-1
2 Phases irrigation
Maize irrigation with the water pillow (WP) method.
A view of water escaping through holes in the pipe
onto the soil surface.
AdvantagesAdvantages
Soil particles cannot be transformed by water.
Water drains out from the holes with 0.001ls-1
at max. discharge.
Soil slope and type is not so important.
Soil erosion prevented at maximum degree, when the plastic pipe is
filled up with the water.
Surface runoff prevented and deep percolation is reduced
Weed growth can be controlled.
Handa, (1991) reported that black polyethylene film gave effective
weed control by cutting down solar radiation.
The amount applied irrigation water could be calculated and
controlled easily.
Contdâ€ĻContdâ€Ļ
Choi and Chung (1997), Park et al. (1996) have resulted that WP
irrigation plots have higher temperature than FI.
Evaporation losses can be prevented mainly by the use of mulch
Number of irrigation is reduced.
Irrigation operation is quite easy and does not require extensive
labour as compared to surface irrigation.
Liquid fertilizer and plant growth regulators can be applied as like
pressurized irrigation system.
There is no need of any external energy because water trickles from
the pipe by the force of gravity.
Disadvantages
Sloppy surfaces causes uneven water distribution
but this problem is solved by using a chain like plastic pipe with
shorter row lengths so that the end pressure in the tubing system can
be maintained.
Using mechanical devices could be difficult during the growing
season.
This negative situation can be solved by leaving one row empty and
other is full with wp, so that area between the rows from each side is
quite enough for cultural practices.
Pillow irrigation with leaving one row emptyâ€Ļ.Pillow irrigation with leaving one row emptyâ€Ļ.
Effectiveness of water pillow irrigation method on yield and water use
efficiency on hot pepper (Capsicum annuum L.)
By
Nuray, C., Sinan, G., Murat, D.,
Scientia Horticulturae 120 (2009)Scientia Horticulturae 120 (2009)
Volume 120 pg.no. 325–329325–329 Year 2009
Case study -I
1919
Introduction
In modern agriculture, irrigation should be practiced optimallyIn modern agriculture, irrigation should be practiced optimally
by modern irrigation methods for a sustainable agriculture,by modern irrigation methods for a sustainable agriculture,
especially where water resources are limited.especially where water resources are limited.
Ironically, Many researches stated that drip irrigationIronically, Many researches stated that drip irrigation
accompanying with black plastic mulches have many beneficialaccompanying with black plastic mulches have many beneficial
effects such as conserving the soil moisture, suppressing weedeffects such as conserving the soil moisture, suppressing weed
growth, moderating soil temperature, and increasing yields.growth, moderating soil temperature, and increasing yields.
Water pillow (WP) is a novel irrigation method, combines dripWater pillow (WP) is a novel irrigation method, combines drip
irrigation and mulching, and can be used to irrigate crops grownirrigation and mulching, and can be used to irrigate crops grown
in rows.in rows.
2020
Irrigation of pepper plant with pillow irrigation
Material and MethodologyMaterial and Methodology
īŽ Experiment was conducted - 2004 and 2005.
īŽ Area - Agricultural Faculty, in a semi-arid zone, Sanliurfa, Turkey.
īŽ Station - latitude of 370
08’Nand, a longitude of 380
46’E
īŽ Mean sea level - 464 m above.
īŽ The long-term average annual precipitation- 424 mm
īŽ Temperature- 28 0
C
īŽ Relative humidity - 40%,
īŽ Texture- clay loam textured, deep
īŽ Average field capacity- 32%
īŽ permanent wilting point,- 22.3%,
īŽ dry bulk density- 1.38 g cm3
īŽ pH - 7.3,
īŽ pH of water -7
īŽ EC - 0.31 dS m-1
īŽ Experimental design- completely randomized block (CRD)
īŽ Irrigation method- water pillow (WP), Furrow irrigation (FI).
īŽ In the WP method, there were three irrigation intervals, 7 days
(WP7), 9 days (WP9), and 11 days (WP11).
īŽ FI was made every 5-day interval practice; this was due to the
climatic conditions such as low humidity, high temperature and
wind speed, which led to more frequent irrigation schedule in this
semi-arid area.
2323
WP experimental sub-plotWP experimental sub-plot
Trickling of the water from micro holes in to the soil
īŽ ET = I Âą ΔSW
īŽ where IWUE is irrigation water use efficiency (kg ha-1
mm-1
),
īŽ WUE is water use efficiency (kg ha-1
mm-1
),
īŽ Y is fresh green yield (kg ha-1
)
īŽ I is total amount of applied irrigation water (mm),
īŽ and ET is total evapotranspiration (mm).
īŽ Δ SW is the soil water content changes
I
Y
IWUE =
ET
Y
WUE =
Result and discussionsResult and discussions
Year Treatment Irrigation
interval
Applied
irrigation(mm)
ET
(mm)
Yield(tha-1
)
2004 FI 5 1879 1947 35.2
WP7 7 1232 1262 41.6
WP9 9 942 1017 38.5
WP11 11 797 887 34.1
2005 FI 5 1539 1640 30.2
WP7 7 1089 1136 30.4
WP9 9 870 938 29.5
WP11 11 725 810 28.5
Yield
Soil temperatureSoil temperature
īŽ Soil temperature tended to increase by the black plastic pipe used in
this study due to its mulch effect.
īŽ The mean soil temperatures at 30 cm depth for the FI, WP7, WP9,
and WP11 treatments in 2004 were 28.8, 29.1, 29.2 and 29.20
C,
respectively.
īŽ The mean soil temperature difference between FI and WP treatments
was 1.9 in 2004.
īŽ Niu et al. (1998) showed that soil water and temperature of the soil
is increased due to the use of mulch.
īŽ Hu et al. (1995) recorded earlier seedling emergence, enhanced crop
growth and nodule development in groundnut.
2929
water use efficiency (WUE) and irrigation water use efficiency
(IWUE)
Year Treatment Irrigation
interval
Applied
irrigation(mm)
WUE
(kg ha-1
mm-1
)
IWUE
(kg ha-1
mm-1
)
2004 FI 5 1879 18.0 18.5
WP7 7 1232 33.0 33.7
WP9 9 942 37.8 40.8
WP11 11 797 38.4 42.8
2005 FI 5 1539 18.4 19.6
WP7 7 1089 26.7 27.9
WP9 9 870 31.4 33.9
WP11 11 725 35.2 39.3
Economic analysisEconomic analysis
No. Cost economics FI WP7 WP9 WP11
1 Water used (mm) 1718 1160 906 761
2 Yield (t ha-1
) 32.7 36 34 31.3
3 Profit (US$) 2471 2500 2070 1533
4 Net profit per mm of water used (US$) 1.44 2.15 2.28 2.01
5 Yield per mm of water used (t ha-1
mm-1
) 19 31 37.5 41.1
ConclusionConclusion
īŽ Study showed that WP irrigation method has more advantages in
yield and higher WUE than that of FI method.
īŽ WP11 treatment is a way to save water up to 125% in comparison
to FI method.
īŽ In addition, the mulch effect of WP method prevents growing
weeds; therefore, use of herbicides would also be lessened.
īŽ Among other management strategies in optimizing the
environmental conditions for plant growth, further studies on the
performance of WP method with different crops, soils and climatic
conditions would be carried out to evaluate the more beneficial sides
of this method such as the control of disease spread and salinity.
3232
Water pillow irrigation compared to furrow irrigation for
Soybean production in a semi-arid area
By
Boydak, E., Sinan, G., Okant, M., Dikilita, M.,Boydak, E., Sinan, G., Okant, M., Dikilita, M.,
Agricultural water managementAgricultural water management
Vol. 19 69 6 Pg. No.- 8 7 – 9 28 7 – 9 2 November (2009)
Case study -II
Introduction
Irrigation efficiency is becoming increasingly important in arid and
semi-arid regions with limited water resources.
Therefore, it is necessary to adopt specialized and efficient methods
of irrigation, such as drip irrigation, and water pillow irrigation in
order to achieve the twin objectives of higher productivity and
optimum use of water.
Material and MethodologyMaterial and Methodology
īŽ Experiment was conducted - 2003 and 2006.
īŽ Area- Agricultural Faculty, in a semi-arid zone, Sanliurfa, Turkey.
īŽ station - latitude of 370
08’Nand, a longitude of 380
46’E
īŽ Mean sea level - 464 m above.
īŽ The long-term average annual precipitation- 390 mm
īŽ Temperature- 28 0
C
īŽ Relative humidity - 40%,
īŽ Texture- clay loam textured
īŽ Average field capacity- 32%
īŽ permanent wilting point,- 22.3%,
īŽ dry bulk density- 1.4 g cm-3
īŽ pH - 7.3,
īŽ pH of water -7
īŽ EC - 0.31 dS m-1 3535
īŽ The experimental design was a completely randomized block
design with three replicates.
īŽ Each plot was 10m long and 2.8mwide (four rows per plot) and had
a total area of 28m2
at sowing
īŽ There was a 2m space between each plot in order to minimize water
movement among treatments.
īŽ There were four irrigation treatments: one FI treatment and three
WP irrigation treatments (WP1.0, WP0.75 and WP0.50).
īŽ In the FI and WP1.0 treatments, which were designated as full
irrigation, root zone soil water content was increased to field
capacity at each irrigation.
īŽ The remaining two irrigation treatments, WP0.75 and WP0.5, were
essentially deficit irrigation treatments, which received 75 and 50%
of the water applied in the WP1.0 treatment, respectively.
WP experimental sub-plotWP experimental sub-plot
A view of soybean irrigation with the WP method
ET =P+ I – D - R ± ΔS
īŽ P is the precipitation, I is the applied irrigation water, D
īŽ is the drainage, R is the runoff, and ΔS is the change in soil
water content in that interval.
īŽ where IWUE is irrigation water use efficiency (kg ha-1
mm-1
),
īŽ WUE is water use efficiency (kg ha-1
mm-1
)
3939
I
Y
IWUE =
ET
Y
WUE =
Result and discussionsResult and discussions
Year Treatment Applied
irrigation(mm)
ET(mm) Yield(tha-1
)
2003 FI 1173 1261 2030
WP1 853 921 2260
WP0.75 669 727 2050
WP0.50 485 513 1345
2006 FI 1150 1229 2050
WP1 848 904 2280
WP0.75 668 713 2070
WP0.50 487 522 1380
Yield
Irrigation water use efficiencyIrrigation water use efficiency
Year Treatment IWUE
(kg ha1mm1)
WUE
(kg ha1 mm1)
2003 FI 1.73 1.60
WP1 2.65 2.45
WP0.75 3.06 2.82
WP0.50 2.77 2.62
2006 FI 1.78 1.67
WP1 2.69 2.52
WP0.75 3.10 2.90
WP0.50 2.83 2.64
TemperatureTemperature
īŽ The mean soil temperature at a depth of 20 cm ranged from 33.1 to
30.50
C in the WP treatments, whereas it changed significantly from
31.9 to 29.70
C in the FI treatment .
īŽ The mean soil temperature difference between FI and WP treatments
was 1.40
C in 2003 and 2.00
C in 2006.
ConclusionConclusion
īŽ WP irrigation method had significant effects on the growth and yield
of soybean.
īŽ WP irrigation at a suitable level is preferred over the FI method, as
it saves water and maximizes yield with the same volume of water.
Considering the IWUE and WUE, WP0.75 treatment is
recommended.
īŽ The WP system is economical to use and operate compared to the FI
and drip irrigation method by restricting weed growth.
Overall conclusionOverall conclusion
īŽ The world now faces very serious global warming, and therefore, it
is very necessary to take the step towards efficient irrigation
methods.
īŽ In modern agriculture, irrigation should be practiced optimally by
modern irrigation methods like sustainable agriculture, specially
where water resources are limited. Ironically, in semi-arid climatic
regions.
īŽ Therefore it is very necessary to adopt special and efficient method
of irrigation such as water pillow irrigation.
īŽ WP irrigation is more advantages over the furrow and drip
irrigation where enhances seedling emergence, reduces soil
evaporation, increases water uptake, WUE and topsoil temperature.
4444
ReferencesReferences
īŽ Antony, E. and Singandhupe, R. B., 2004, Impact of drip and surface irrigation on growth,
yield and WUE of capsicum (Capsicum annum L.). Agric. Water Manage., 65: 121–
132.
īŽ Boydak, E., Sinan, G., Okant, M. and Dikilita, M., 2009, Water pillow irrigation compared to
furrow irrigation for soybean production in a semi-arid area. Agric. Water Manage., 96:
87-92.
īŽ Choi, B.H. and Chung, K.Y., 1997, Effect of polythene-mulching on flowering and yield of
groundnut in Korea. Int. Arachis Newslett., 17: 49–51.
īŽ Hanada, T., 1991, The effect of mulching and row covers on vegetable production. Extension
Bulletin, ASPAC., 33: 22-22.
īŽ Hu, W., Duan, S. and Sui, Q., 1995, High yield technology for groundnut. Int. Arachis
Newslett., 15: 1–22.
īŽ Mustafa, O. and Sinan, G., 2010, Evaluation of CERES-maize simulation model results with
measured data using water pillow irrigation under semi-arid climatic conditions.
African Journal of Agricultural Research., 5(8): 606-613.
īŽ Niu, J. Y., Gan, Y. T., Zhang, J. W. and Yang, Q. F., 1998, Postanthesis dry matter
accumulation and distribution in spring wheat mulched with plastic film. Crop Sci., 38:
1562–1568. 4545
īŽ Nuray, C., Sinan, G. and Murat, D., 2009, Effectiveness of water pillow irrigation method on
yield and water use efficiency on hot pepper (Capsicum annuum L.). Scientia
Horticulturae., 120: 325–329.
īŽ Sinan, G., 2006, Water pillow: a new irrigation method. J. Appl. Sci., 6 (2): 315–317.
īŽ Tiwari, K. N., Singh, A. and Mal, P. K., 2003, Effect of drip irrigation on yield of cabbage
(Brassica oleracea L. var. capitata) under mulch and non-mulch conditions. Agric.
Water Manage., 58: 19–28.
īŽ Ramakrishna, A., Tam, H. M., Wani, S. P. and Long, T. D., 2006, Effects of mulch on soil
temperature, moisture, weed infestation and yield of groundnut in northern Vietnam.
Field Crop Res., 95: 115–125.
4747
â€Ļ..Discussionsâ€Ļâ€Ļ
4848
â€Ļ..Thank youâ€Ļ..

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Pillow irrigation

  • 2. “Effectiveness of pillow irrigation in water use efficiency and crop yield” Course Teacher Dr. Nimichandrappa Guided By Dr. B. S. Polisegowdar Presented By Sweta ID NO. PG14AEG6117 M. Tech (Soil and Water conservation engineering) College of agricultural engineering, University of agricultural sciences Raichur.
  • 4. PREFACEPREFACE Rapid increase in the population and demand on food have led us to produce more food this off course, has led us to use water more efficiently and economically. Irrigation is a major important factor as compared to other factors like tillage, seed and pest management. Water is basic resource for sustainable agriculture. Improved water management methods are all ways on demand. 44
  • 5. Surface irrigation is the most commonly used method as over 95% of irrigation is done by surface irrigation but in recent years there is rapid increase in the pressurized irrigation and with mulch application. Researchers have developed many irrigation method as alter furrow and surge flow to improve the irrigation efficiency. Same way the water pillow irrigation is one of the latest and best method of irrigation to increase the water use efficiency. 55
  • 6. Water pillow irrigationWater pillow irrigation 66 īŽ Drip irrigation, the use of mulching provides many advantages, (Tiwari et al., 2003; Antony and 2004; Ramakrishna et al., 2006). īŽ The water pillow (WP) is a new irrigation method that combines drip irrigation and mulch, offers a number of unique opportunities to save water .(Sinan, G., 2006). water pillow ++ == Water pillow
  • 7. HistoryHistory īŽ Over 40 yrs back the flex tanks and fuel bladder are used to store the liquids. īŽ Ist fileld study was conducted in 2003 & 2004 growing season at the university of Harren, Agricultural Research station sanliurfa, Turkey. 77
  • 8. Crop suitabilityCrop suitability īŽ Water pillow irrigation is applied ideally and economically at the green houses and flat areas. īŽ Crops suitable- Soyabean(edamame;Glycine max.), Pepper(capsicum annuum L.), Eggplant, Cotton(malvaceae) and Maize(zeamays).
  • 9. componentscomponents 1. Laterals1. Laterals 2. A portable polyethylene plastic pipe with 0.30mm in thick.2. A portable polyethylene plastic pipe with 0.30mm in thick. Diameter of the pipe should almost cover the row spacing.Diameter of the pipe should almost cover the row spacing. Plastic pipe should be usable for 2 years.Plastic pipe should be usable for 2 years.
  • 10. ConstructionsConstructions īŽ Plastic pipe hole is pierced along the bottom with hole ~ 1mm. īŽ The design and interspacing of the holes depends on the soil infiltration capacity, soil type and crops. īŽ After filling the water both the ends are blocked by tying rope.
  • 11. Preparation of land before irrigationâ€Ļ.Preparation of land before irrigationâ€Ļ. Before irrigation land should be levelled, soil surface must beBefore irrigation land should be levelled, soil surface must be cleared of sharp material like crop residuals and stones, this maycleared of sharp material like crop residuals and stones, this may helps to achieve uniform water distribution in the soil.helps to achieve uniform water distribution in the soil. Plastic pipe is laid out in the row from sowing to harvest it acts asPlastic pipe is laid out in the row from sowing to harvest it acts as mulch.mulch. Black plastic is usually used to reduce the evaporation loss orBlack plastic is usually used to reduce the evaporation loss or erosion from the soil surface and controls the weed.erosion from the soil surface and controls the weed. 1111
  • 12. Workingâ€Ļ. Of water pillow irrigationâ€Ļ.Workingâ€Ļ. Of water pillow irrigationâ€Ļ. For irrigation operation water is delivered to each plastic pipe through laterals. It need not need any external system of energy as compared to pressurized irrigation system. Water trickles from the plastic pipe with gravity and then infiltrates in to the soil as it does in drip irrigation system. īŽ Filling Filing time is short. Ex- a plastic pipe 0.40m in dia. Is filled up fully in 14min. With a 15ls-1 īŽ Trickling Trickling time is long. Ex- whole event is could be completed in 24hrs. Generally with speed of 0.001ls-1 2 Phases irrigation
  • 13. Maize irrigation with the water pillow (WP) method.
  • 14. A view of water escaping through holes in the pipe onto the soil surface.
  • 15. AdvantagesAdvantages Soil particles cannot be transformed by water. Water drains out from the holes with 0.001ls-1 at max. discharge. Soil slope and type is not so important. Soil erosion prevented at maximum degree, when the plastic pipe is filled up with the water. Surface runoff prevented and deep percolation is reduced Weed growth can be controlled. Handa, (1991) reported that black polyethylene film gave effective weed control by cutting down solar radiation. The amount applied irrigation water could be calculated and controlled easily.
  • 16. Contdâ€ĻContdâ€Ļ Choi and Chung (1997), Park et al. (1996) have resulted that WP irrigation plots have higher temperature than FI. Evaporation losses can be prevented mainly by the use of mulch Number of irrigation is reduced. Irrigation operation is quite easy and does not require extensive labour as compared to surface irrigation. Liquid fertilizer and plant growth regulators can be applied as like pressurized irrigation system. There is no need of any external energy because water trickles from the pipe by the force of gravity.
  • 17. Disadvantages Sloppy surfaces causes uneven water distribution but this problem is solved by using a chain like plastic pipe with shorter row lengths so that the end pressure in the tubing system can be maintained. Using mechanical devices could be difficult during the growing season. This negative situation can be solved by leaving one row empty and other is full with wp, so that area between the rows from each side is quite enough for cultural practices.
  • 18. Pillow irrigation with leaving one row emptyâ€Ļ.Pillow irrigation with leaving one row emptyâ€Ļ.
  • 19. Effectiveness of water pillow irrigation method on yield and water use efficiency on hot pepper (Capsicum annuum L.) By Nuray, C., Sinan, G., Murat, D., Scientia Horticulturae 120 (2009)Scientia Horticulturae 120 (2009) Volume 120 pg.no. 325–329325–329 Year 2009 Case study -I 1919
  • 20. Introduction In modern agriculture, irrigation should be practiced optimallyIn modern agriculture, irrigation should be practiced optimally by modern irrigation methods for a sustainable agriculture,by modern irrigation methods for a sustainable agriculture, especially where water resources are limited.especially where water resources are limited. Ironically, Many researches stated that drip irrigationIronically, Many researches stated that drip irrigation accompanying with black plastic mulches have many beneficialaccompanying with black plastic mulches have many beneficial effects such as conserving the soil moisture, suppressing weedeffects such as conserving the soil moisture, suppressing weed growth, moderating soil temperature, and increasing yields.growth, moderating soil temperature, and increasing yields. Water pillow (WP) is a novel irrigation method, combines dripWater pillow (WP) is a novel irrigation method, combines drip irrigation and mulching, and can be used to irrigate crops grownirrigation and mulching, and can be used to irrigate crops grown in rows.in rows. 2020
  • 21. Irrigation of pepper plant with pillow irrigation
  • 22. Material and MethodologyMaterial and Methodology īŽ Experiment was conducted - 2004 and 2005. īŽ Area - Agricultural Faculty, in a semi-arid zone, Sanliurfa, Turkey. īŽ Station - latitude of 370 08’Nand, a longitude of 380 46’E īŽ Mean sea level - 464 m above. īŽ The long-term average annual precipitation- 424 mm īŽ Temperature- 28 0 C īŽ Relative humidity - 40%, īŽ Texture- clay loam textured, deep īŽ Average field capacity- 32% īŽ permanent wilting point,- 22.3%, īŽ dry bulk density- 1.38 g cm3 īŽ pH - 7.3, īŽ pH of water -7 īŽ EC - 0.31 dS m-1
  • 23. īŽ Experimental design- completely randomized block (CRD) īŽ Irrigation method- water pillow (WP), Furrow irrigation (FI). īŽ In the WP method, there were three irrigation intervals, 7 days (WP7), 9 days (WP9), and 11 days (WP11). īŽ FI was made every 5-day interval practice; this was due to the climatic conditions such as low humidity, high temperature and wind speed, which led to more frequent irrigation schedule in this semi-arid area. 2323
  • 24. WP experimental sub-plotWP experimental sub-plot
  • 25. Trickling of the water from micro holes in to the soil
  • 26. īŽ ET = I Âą ΔSW īŽ where IWUE is irrigation water use efficiency (kg ha-1 mm-1 ), īŽ WUE is water use efficiency (kg ha-1 mm-1 ), īŽ Y is fresh green yield (kg ha-1 ) īŽ I is total amount of applied irrigation water (mm), īŽ and ET is total evapotranspiration (mm). īŽ Δ SW is the soil water content changes I Y IWUE = ET Y WUE =
  • 27. Result and discussionsResult and discussions Year Treatment Irrigation interval Applied irrigation(mm) ET (mm) Yield(tha-1 ) 2004 FI 5 1879 1947 35.2 WP7 7 1232 1262 41.6 WP9 9 942 1017 38.5 WP11 11 797 887 34.1 2005 FI 5 1539 1640 30.2 WP7 7 1089 1136 30.4 WP9 9 870 938 29.5 WP11 11 725 810 28.5 Yield
  • 28. Soil temperatureSoil temperature īŽ Soil temperature tended to increase by the black plastic pipe used in this study due to its mulch effect. īŽ The mean soil temperatures at 30 cm depth for the FI, WP7, WP9, and WP11 treatments in 2004 were 28.8, 29.1, 29.2 and 29.20 C, respectively. īŽ The mean soil temperature difference between FI and WP treatments was 1.9 in 2004.
  • 29. īŽ Niu et al. (1998) showed that soil water and temperature of the soil is increased due to the use of mulch. īŽ Hu et al. (1995) recorded earlier seedling emergence, enhanced crop growth and nodule development in groundnut. 2929
  • 30. water use efficiency (WUE) and irrigation water use efficiency (IWUE) Year Treatment Irrigation interval Applied irrigation(mm) WUE (kg ha-1 mm-1 ) IWUE (kg ha-1 mm-1 ) 2004 FI 5 1879 18.0 18.5 WP7 7 1232 33.0 33.7 WP9 9 942 37.8 40.8 WP11 11 797 38.4 42.8 2005 FI 5 1539 18.4 19.6 WP7 7 1089 26.7 27.9 WP9 9 870 31.4 33.9 WP11 11 725 35.2 39.3
  • 31. Economic analysisEconomic analysis No. Cost economics FI WP7 WP9 WP11 1 Water used (mm) 1718 1160 906 761 2 Yield (t ha-1 ) 32.7 36 34 31.3 3 Profit (US$) 2471 2500 2070 1533 4 Net profit per mm of water used (US$) 1.44 2.15 2.28 2.01 5 Yield per mm of water used (t ha-1 mm-1 ) 19 31 37.5 41.1
  • 32. ConclusionConclusion īŽ Study showed that WP irrigation method has more advantages in yield and higher WUE than that of FI method. īŽ WP11 treatment is a way to save water up to 125% in comparison to FI method. īŽ In addition, the mulch effect of WP method prevents growing weeds; therefore, use of herbicides would also be lessened. īŽ Among other management strategies in optimizing the environmental conditions for plant growth, further studies on the performance of WP method with different crops, soils and climatic conditions would be carried out to evaluate the more beneficial sides of this method such as the control of disease spread and salinity. 3232
  • 33. Water pillow irrigation compared to furrow irrigation for Soybean production in a semi-arid area By Boydak, E., Sinan, G., Okant, M., Dikilita, M.,Boydak, E., Sinan, G., Okant, M., Dikilita, M., Agricultural water managementAgricultural water management Vol. 19 69 6 Pg. No.- 8 7 – 9 28 7 – 9 2 November (2009) Case study -II
  • 34. Introduction Irrigation efficiency is becoming increasingly important in arid and semi-arid regions with limited water resources. Therefore, it is necessary to adopt specialized and efficient methods of irrigation, such as drip irrigation, and water pillow irrigation in order to achieve the twin objectives of higher productivity and optimum use of water.
  • 35. Material and MethodologyMaterial and Methodology īŽ Experiment was conducted - 2003 and 2006. īŽ Area- Agricultural Faculty, in a semi-arid zone, Sanliurfa, Turkey. īŽ station - latitude of 370 08’Nand, a longitude of 380 46’E īŽ Mean sea level - 464 m above. īŽ The long-term average annual precipitation- 390 mm īŽ Temperature- 28 0 C īŽ Relative humidity - 40%, īŽ Texture- clay loam textured īŽ Average field capacity- 32% īŽ permanent wilting point,- 22.3%, īŽ dry bulk density- 1.4 g cm-3 īŽ pH - 7.3, īŽ pH of water -7 īŽ EC - 0.31 dS m-1 3535
  • 36. īŽ The experimental design was a completely randomized block design with three replicates. īŽ Each plot was 10m long and 2.8mwide (four rows per plot) and had a total area of 28m2 at sowing īŽ There was a 2m space between each plot in order to minimize water movement among treatments. īŽ There were four irrigation treatments: one FI treatment and three WP irrigation treatments (WP1.0, WP0.75 and WP0.50). īŽ In the FI and WP1.0 treatments, which were designated as full irrigation, root zone soil water content was increased to field capacity at each irrigation. īŽ The remaining two irrigation treatments, WP0.75 and WP0.5, were essentially deficit irrigation treatments, which received 75 and 50% of the water applied in the WP1.0 treatment, respectively.
  • 37. WP experimental sub-plotWP experimental sub-plot
  • 38. A view of soybean irrigation with the WP method
  • 39. ET =P+ I – D - R Âą ΔS īŽ P is the precipitation, I is the applied irrigation water, D īŽ is the drainage, R is the runoff, and ΔS is the change in soil water content in that interval. īŽ where IWUE is irrigation water use efficiency (kg ha-1 mm-1 ), īŽ WUE is water use efficiency (kg ha-1 mm-1 ) 3939 I Y IWUE = ET Y WUE =
  • 40. Result and discussionsResult and discussions Year Treatment Applied irrigation(mm) ET(mm) Yield(tha-1 ) 2003 FI 1173 1261 2030 WP1 853 921 2260 WP0.75 669 727 2050 WP0.50 485 513 1345 2006 FI 1150 1229 2050 WP1 848 904 2280 WP0.75 668 713 2070 WP0.50 487 522 1380 Yield
  • 41. Irrigation water use efficiencyIrrigation water use efficiency Year Treatment IWUE (kg ha1mm1) WUE (kg ha1 mm1) 2003 FI 1.73 1.60 WP1 2.65 2.45 WP0.75 3.06 2.82 WP0.50 2.77 2.62 2006 FI 1.78 1.67 WP1 2.69 2.52 WP0.75 3.10 2.90 WP0.50 2.83 2.64
  • 42. TemperatureTemperature īŽ The mean soil temperature at a depth of 20 cm ranged from 33.1 to 30.50 C in the WP treatments, whereas it changed significantly from 31.9 to 29.70 C in the FI treatment . īŽ The mean soil temperature difference between FI and WP treatments was 1.40 C in 2003 and 2.00 C in 2006.
  • 43. ConclusionConclusion īŽ WP irrigation method had significant effects on the growth and yield of soybean. īŽ WP irrigation at a suitable level is preferred over the FI method, as it saves water and maximizes yield with the same volume of water. Considering the IWUE and WUE, WP0.75 treatment is recommended. īŽ The WP system is economical to use and operate compared to the FI and drip irrigation method by restricting weed growth.
  • 44. Overall conclusionOverall conclusion īŽ The world now faces very serious global warming, and therefore, it is very necessary to take the step towards efficient irrigation methods. īŽ In modern agriculture, irrigation should be practiced optimally by modern irrigation methods like sustainable agriculture, specially where water resources are limited. Ironically, in semi-arid climatic regions. īŽ Therefore it is very necessary to adopt special and efficient method of irrigation such as water pillow irrigation. īŽ WP irrigation is more advantages over the furrow and drip irrigation where enhances seedling emergence, reduces soil evaporation, increases water uptake, WUE and topsoil temperature. 4444
  • 45. ReferencesReferences īŽ Antony, E. and Singandhupe, R. B., 2004, Impact of drip and surface irrigation on growth, yield and WUE of capsicum (Capsicum annum L.). Agric. Water Manage., 65: 121– 132. īŽ Boydak, E., Sinan, G., Okant, M. and Dikilita, M., 2009, Water pillow irrigation compared to furrow irrigation for soybean production in a semi-arid area. Agric. Water Manage., 96: 87-92. īŽ Choi, B.H. and Chung, K.Y., 1997, Effect of polythene-mulching on flowering and yield of groundnut in Korea. Int. Arachis Newslett., 17: 49–51. īŽ Hanada, T., 1991, The effect of mulching and row covers on vegetable production. Extension Bulletin, ASPAC., 33: 22-22. īŽ Hu, W., Duan, S. and Sui, Q., 1995, High yield technology for groundnut. Int. Arachis Newslett., 15: 1–22. īŽ Mustafa, O. and Sinan, G., 2010, Evaluation of CERES-maize simulation model results with measured data using water pillow irrigation under semi-arid climatic conditions. African Journal of Agricultural Research., 5(8): 606-613. īŽ Niu, J. Y., Gan, Y. T., Zhang, J. W. and Yang, Q. F., 1998, Postanthesis dry matter accumulation and distribution in spring wheat mulched with plastic film. Crop Sci., 38: 1562–1568. 4545
  • 46. īŽ Nuray, C., Sinan, G. and Murat, D., 2009, Effectiveness of water pillow irrigation method on yield and water use efficiency on hot pepper (Capsicum annuum L.). Scientia Horticulturae., 120: 325–329. īŽ Sinan, G., 2006, Water pillow: a new irrigation method. J. Appl. Sci., 6 (2): 315–317. īŽ Tiwari, K. N., Singh, A. and Mal, P. K., 2003, Effect of drip irrigation on yield of cabbage (Brassica oleracea L. var. capitata) under mulch and non-mulch conditions. Agric. Water Manage., 58: 19–28. īŽ Ramakrishna, A., Tam, H. M., Wani, S. P. and Long, T. D., 2006, Effects of mulch on soil temperature, moisture, weed infestation and yield of groundnut in northern Vietnam. Field Crop Res., 95: 115–125.

Editor's Notes

  1. Maize, pepper
  2. Pepper,1st
  3. 1st and
  4. 1ST
  5. No contact between water and soil surface.
  6. The average yield of pepper obtained from the results of two years, irrigation frequencies and amounts were presented in Table 1. Pepper fruit yield ranged from 34.1 (WP11) to 41.6 (WP7) kg ha1 in 2004. The maximum yield was obtained from WP7 treatment, followed by WP9, FI and WP11 in 2004. Although there was a high amount of irrigation water quaint between the FI and WP treatments, there was no statistical significant difference found between the irrigation amount and the yield interactions in both years (P < 0.05). No stress signs on the pepper plant throughout the growing season were observed for all treatments in two years. Higher water productivity in case of different WP irrigation treatments was obviously due to higher yields accompanied by saving of irrigation water and mulch effect of plastic pipes as compared to the FI method. In the 2005 growing season, the maximum and minimum yields obtained from the same treatments showed similarity as in those of the first year (Table 1). Yield values showed significant differences between the years. This may be due to the flower losses caused by unexpected and sudden temperature rises in 2005. However, when the years were considered individually, it was seen that WP irrigation system provided considerable water saving in comparison to FI irrigation system. This is particularly important to prove the effectiveness of WP irrigation system in terms of saving water. The total biomass of pepper based on two-year results was given in Table 1. Also, although applied water amounts and interval were different by treatments, there was no significant difference between irrigation amount and total biomass interaction as between irrigation amount and total biomass interaction in both years (P < 0.05). These results were in agreement with those of others indicating that the incorporation of drip irrigation with black plastic mulch culture increased the yield of crops and water use efficiency. Sammis and Wu (1986) for tomato, Tiwari et al. (2003) for cabbage found similar findings. The work of Herrera et al. (2002) was also in agreement with our findings. They stated that the mulching materials reduced water lost through evaporation and increased root dry weight in pepper.
  7. Soil temperature tended to increase by the black plastic pipe used in this study due to its mulch effect. The mean soil temperatures at 30 cm depth for the FI, WP7, WP9, and WP11 treatments in 2004 were 28.8, 29.1, 29.2 and 29.2 8C, respectively (Fig. 3, only FI andWP7 data were presented and WP9 and WP11 data were similar toWP7). The soil temperature was slightly lower in the FI treatment than that of WP in both years. The mean soil temperature difference between FI and WP treatments was 1.9 in 2004. There were no significant differences among the WP treatments (WP7, WP9 and WP11) in soil temperature in both years. In general, irrigation water temperature in plastic pipes increased from 23.1 to 30.1 8C in daytime. The higher soil temperatures of WP plots were consistent with the results of Choi and Chung (1997), Park et al. (1996) and Hanada (1991). The results clearly showed that plastic pipes also had a mulch effect in the increment of soil temperature. Again many researchers indicated that mulch raises the soil temperature and affects on promote crop development, earlier harvest, and increase yields. Niu et al. (1998) showed that improved soil water and temperature with polythene mulches better seedling emergence in spring wheat, while Hu et al. (1995) recorded earlier seedling emergence, enhanced crop growth and nodule development in groundnut.
  8. Water use efficiencies and soil water content The total water use under different quantities of water applied through WP and furrow irrigation treatments, WUE, IWUE and Irc values were also presented in Table 1. WUE values varied from 18 to 38.4 kg ha1 mm1 in 2004 and from 18.4 to 35.2 kg ha1 mm1 in 2005. The maximum WUE value (38.4 kg ha1 mm1) was obtained in WP11 treatment, followed by WP9, WP7 and FI treatments in 2004. In 2005 growing season, the maximum WUE value (35.2 kg ha1 mm1) was obtained in WP11 treatment, followed by WP9, WP7 and the FI treatments. The maximum IWUE value was obtained in WP11 treatment followed by WP9, WP7 and FI treatments in both experimental years. These quite remarkable high values of WUE and IWUE for different quantities of water applied through the WP irrigation method were reversely proportional to the quantity of water applied through the WP method. Treatments with lower amount of water had generally higher WUE and IWUE values than FI. WUE and IWUE values of FI were considerably lower than those of all WP treatments. These might be the results of mulch effect provided by WP method. Mulches greatly retarded the loss of moisture from the soil. As a result, higher and uniform soil moisture regime is maintained reducing the irrigation frequency. Reduction in evaporation loss through mulch was responsible for higher WUE of the pepper crop. These results were in agreement with the other studies which indicated that the incorporation of drip irrigation with black plastic mulch culture increased the yield of crops and WUE in the works of Sammis and Wu (1986) for tomato, Antony and Singandhupe (2004) for pepper, Ramakrishna et al. (2006) for groundnut, and Yuan et al. (2006) for cucumber. On the other hand, irrigation water compensation values (Irc) varied from 90 to 94% in both experimental years. Irrigation water consumption, Irc, was, in general, higher in the treatments irrigated with high amount of water than those irrigated with low amount of water. Irc values of the FI treatment were higher than those of the WP treatments (Table 1). This might be due to the fact that plants did not suffer from water deficit with short irrigation intervals. For example, Radin et al. (1989) reported that frequent irrigations prevented the large fluctuation in plant water stress. In a similar way, our results suggested that WP might be applied in water-limited areas to save water and prevent fluctuations caused by infrequent irrigations without resulting in any significant yield reduction. The total seasonal ET under different WP and FI treatment values were also presented in Table 1. The measured seasonal ET values for hot pepper were ranged from 1947 to 887 mm in 2004 and from 1640 to 810 mm in 2005. The highest and the lowest seasonal ET values were obtained from FI and WP11 plots in both years, respectively. In all WPtreatments, the ET values were clearly less than that of the FI treatment in both years. The fact is that mulching effect of plastic pipe prevents soil water evaporation, and therefore helps retain soil moisture. Thus, in general, higher water content was always observed in the 0–90 cm soil layer of the WP plots compared to that of the FI plot. The study showed that the soil water content in the root zone of the FI treatment plot was reduced from field capacity to wilting point, whereas the water content in the WP7 and WP9 treatment plots remained well above the wilting range with 7- and 9-day irrigation intervals. Before irrigation, soil water content was always higher in the WP7 (24.5–26.1%) and WP9 treatment plots (24.0–25.5%) than that of the FI treatment plots (23.5–24.2%). Also, the water content of the WP11 treatment plot (22.3–23.8%) was close to that of the FI treatment plot (23.5– 24.2%). In this study, higher water productivity accompanied by higher yields for the WP treatments probably resulted from saving irrigation water through the mulching effect and reduced weed density as compared to the FI method. These results agree withthose reported by Li et al. (2004).
  9. economic analysis of production pepper from per hectare. The profit was found to be highest (US$ 2500) for the treatment (WP7) followed by the treatment FI (US$ 2471). The net profit per mm of water used was obtained to be highest (US$ 2.28) in case of WP9 treatment followed by 2.15 for WP7 treatment and followed by 2.01 for WP11 treatment. The lowest one was found by the FI treatment (US$ 1.44). While the highest yield per unit quantity of water used was 41.1 kg ha1 mm1 for the treatment WP11, the lowest was 19 kg ha1 mm1 for the treatment FI. Seasonal cost of cultivation such as plant protection by herbicides, hoeing, labour and irrigation application in WP method is less than FI method. In addition, the effective use of water and soil resources is increasingly becoming more important. In terms of applied water amounts throughout the season, there is a quite difference between FI and WP treatments (Table 1). For example, a two-year difference between the WP11 and FI treatments is 957 mm. This value is more than applied water amounts to the WP9 and WP11 throughout the season. However, as increasing opportunity cost of the limited water resources including its economic cost is of concern, it could be said that the WP method is more suitable about sustainable agriculture.
  10. According to the results of this research, although applied irrigation water and irrigation intervals were distinct between the FI and WP treatments in 2004 and 2005 growing season, there were no significant differences between irrigation amount–yield and irrigation amount–biomass interactions in both years (P < 0.05). In general, this study showed that WP irrigation method has more advantages in yield and higher WUE than that of FI method. Considering the drought and limited available water conditions in many parts of the world, the WP11 irrigation regime could be recommended in case of pepper irrigation under semiarid climatic belt. In our findings, WP11 treatment is a way to save water up to 125% with only 5% reduction in yield in comparison to FI method. In addition, the mulch effect of WP method prevents growing weeds; therefore, use of herbicides would also be lessened. This could contribute to shift from high-input to organic agriculture. Among other management strategies in optimizing the environmental conditions for plant growth, further studies on the performance of WP method with different crops, soils and climatic conditions would be carried out to evaluate the more beneficial sides of this method such as the control of disease spread and salinity.
  11. The world faces very serious global warming, which will produce a general warming and significantly increase the evaporative demand and the irrigation requirement for crops. For this reason, irrigation efficiency is becoming increasingly important in arid and semi-arid regions with limited water resources. Therefore, it is necessary to adopt specialized and efficient methods of irrigation, such as drip irrigation, in order to achieve the twin objectives of higher productivity and optimum use of water. As well as drip irrigation, the use of mulching provides many advantages, such as increasing yield and quality, decreasing water lost from the soil surface, increasing soil temperature and the reduction of weed growth (Tiwari et al., 2003; Antony and Singandhupe, 2004; Ramakrishna et al., 2006). The water pillow (WP) is a new irrigation method that combines drip irrigation and mulch, and offers a number of unique opportunities to save water as well as alleviating some problems, such as low irrigation efficiency, erosion and weed control (Gerc¸ek, 2006). WP irrigation can be used to irrigate crops grown in rows, such as soybean (Glycine max) and corn (Zea mays). The main components of WP are portable black polyethylene pipes, and laterals (Fig. 1). The pipe is elastic, and should be usable for at least 2 years. The diameter of the pipe should almost cover the row spacing; in this way, the water content in the root zone in the intervals between irrigation and the maximum mulching effect throughout the growing season can be sustained. The pipe is pierced along the bottom with holes of 1 mmdiameter. The design and inter-spacing of the holes depends on the soil infiltration capacity, and needs to be determined for each soil type. Before installing the pipe, the soil surface must be cleared of sharp materials such as crop residuals and stones, and land levelling may help to achieve more uniform water distribution in the soil. The pipe is laid on the soil surface and both the ends are closed by tying with a rope. The pipes remain on the soil surface from sowing until harvest. For irrigation, one end of the pipe is opened and water is introduced through the lateral pipe, and then the main pipe is closed. In the WP method, there are two consecutive irrigation phases, filling and trickling. Filling is done only once and the phase can be quite short, depending on the rate of discharge. However, if the amount of irrigation water needed is greater than the maximum volume of the pipe, water has to be added to the pipe for the continuing irrigation. For example; a pipe 40 cm in diameter and 100m in length is filled within 14 min with a 15 l s1 discharge. The trickling phase is quite lengthy and takes up 24 h. Unlike pressurized irrigation methods, such as drip and sprinkler, the WP method does not need an external energy source, such as an electric or petrol/diesel powered pump, to discharge during the trickling phase, because the water in the pipe seeps out onto the soil surface under the action of gravity The method is new, and detailed studies will be required to refine the system. The objective of this work, which was done under field conditions in Turkey, was to examine the influence of various levels of irrigation by the WP method on the yield, yield components, and water use efficiency (WUE) of soybean plants under semi-arid conditions. The performance and efficiency of the method were compared with the furrow irrigation (FI) method.
  12. The field experiment was done in 2003 and 2006 at theResearch Farm of the Agricultural Faculty of Harran University, Sanliurfa, Turkey. The farm is located at an altitude of 464 m above mean sea level, and is intersected by 378080 N latitude and 388460 E longitude. The region has a semi-arid climate, with an average annual rainfall of about 390 mm. The soil at the experimental site is clay loam with 60% clay, 32% silt and 8% sand. Average field capacity, 32%; permanent wilting point, 22.3%; dry bulk density, 1.4 g cm3; pH7.4 at 0–90 cm soil depth. Water suitable for irrigation (pH 7; EC 0.3 dSm1) was obtained from a deep well in the experimental area. Recommended fertilizer application was based on soil analysis. All treatment plots received the same amount of total fertilizer. A compound fertilizer of 20–20–0 in granular form was applied to the soil at a rate of 60 kg pure N and 60 kg P2O5 ha1 before sowing 20 June 2003 and 19 June 2006. The rest of The N(total of 40 kg ha1) was applied in the form of urea at the start of flowering. Soybean (Glycine max L. cultivar Merill A-3935) was planted on 20 June 2003 and 19 June 2006. Before planting, the land was levelled precisely to aid uniform irrigation water distribution. The seeds were sown 5 cm apart at a depth of 3–4 cm in rows 70 cm wide. This practice is agronomically recommended and it has been used widely in this area for many years (Boydak et al., 2004). Immediately after planting, all plots were irrigated by sprinkler irrigation, once or twice a week and totally fourtimes in the years 2003 and 2006 as pre-treatment irrigation, to provide uniform emergence. The total amount of pre-treatment irrigation water was 151 and 168 mm in the first and second years, respectively. Experimental treatments were started on 12 July 2003 and 11 July 2006. Irrigation was done every 10 days, which is consistent with local practice. Irrigation was continued until 19–20 days before harvest. The plastic pipe used was 0.3mm thick and 38 cm in diameter (covers 85% of the 70 cm row spacing) with 1 mm diameter holes along the bottom. The space between holes was 75 cm and the discharge rate for each hole averaged 2.13 l h1. The experimental design was a completely randomized block design with three replicates. Each plot was 10m long and 2.8mwide (four rows per plot) and had a total area of 28m2 at sowing (Fig. 3). There was a 2m space between each plot in order to minimize water movement among treatments. There were four irrigation treatments: one FI treatment and three WP irrigation treatments (WP1.0, WP0.75 and WP0.50). In the FI and WP1.0 treatments, which were designated as full irrigation, root zone soil water content was increased to field capacity at each irrigation. The remaining two irrigation treatments, WP0.75 and WP0.5, were essentially deficit irriga- tion treatments, which received 75 and 50% of the water applied in the WP1.0 treatment, respectively. FI was used as a control and compared with the WP irrigation methods. In the WP treatments, water was applied by a plastic pipe from onlyone side of each bed (Fig. 1). In the FI plots, water was applied to every furrow in which the plots were closed-up to prevent runoff. Soil water content was determined by a gravimetric sampling method 1 day before irrigation at depths of 0–30, 30– 60 and 60–90 cm to determine the amount of irrigation water to be applied. To do this, the empty pipe was moved gently to one side and replaced carefully after the sampling. The amount of irrigation water applied to each plot was measured by a flow meter. Determination of soil water content and evapotranspiration (ET) calculations were done from sowing until harvest. ET was calculated for each treatment via a water balance equation ET Âŧ P Þ I D R DS where P is the precipitation, I is the applied irrigation water, D is the drainage, R is the runoff, and DS is the change in soil water content in that interval. All terms are expressed in millimeters of water in the crop root zone. Since there was no runoff during irrigation and the water table was at a depth of 4 m, capillary flow to the root zone and runoff were assumed to be negligible in the calculation of ET. On the basis of a number of soil water content measurements, drainage below 90 cm was considered to be negligible. No significantrainfall was recorded during the study. Thus, the above equationwas simplified as: ET Âŧ I DS Irrigation water use efficiency (IWUE, kgmm1 ha1) andwater use efficiency (WUE, kgmm1 ha1) were calculated(Howell et al., 1990) as: IWUE Âŧ Y I WUE Âŧ Y ET where Y is the soybean yield (kg ha1) from irrigation treatments.For yield data, plants were harvested manually from the middle two rows of four rows per plot. Twenty plants per plot were sampled randomly at harvest to determine yield components such as plant height, pod and branch number, 1000 seed weight and harvest index. Harvest index is defined as the ratio of grain weight to the total plant weight at harvest, and is calculated
  13. The total seed yield, branch number, pod number, plant height, harvest index and 1000 seed weight values of soybean under different irrigation treatments for the experimental years are given in Table 1. According to the analysis, there were statistically significant differences in average seed yield and yield components among treatments and between years. The highest average seed yield was observed for the WP1.0 treatment as 2260 and 2280 kg ha1, while the lowest yield was found for theWP0.5 treatment as 1345 and 1380 kg ha1 in 2003 and 2006, respectively. In both years, the seed yield for WP1.0 was 10% higher than that of FI and WP0.75, and 40% higher than that of WP0.50. Again, the maximum average branch number (3.2 per plant), pod number (69.2 per plant), plant height (69.2 cm), harvest index (37%) and 1000 seed weight (137 g) were obtained from the WP1.0 treatment, and this was statistically significantly different from the other treatments. The lowest values for all yield components were obtained from the WP0.50 treatment. All results were similar for 2003 and 2006. The study showed that thewater content in the root zone of the FI treatment plot was reduced from field capacity (32%) to wilting point (22.3%), whereas the water content in the WP1.0 and WP0.75 treatment plots remained well above the wilting range with a 10-day irrigation interval. Before irrigation, soil water content was always higher in the WP1.0 (25.5–27.1%) and WP0.75 treatment plots (23.7–24.5%) thanthat of the FI treatment plots (22.5–23.3%). Also, the water content of the WP0.50 treatment plot (21.4–22.4%)was close to that of the FI treatment plot (22.6–23.4%). These results agree with those reported by Li et al. (2004). In this study, higher water productivity accompanied by higher yields for the WP1.0 and WP0.75 treatments probably resulted from saving irrigation water through the mulchingeffectandreducedweeddensityascomparedto the FI method. Similar findings were reported by Bu¨ ku¨n et al. (2005), who stated that the black plastic pipe reduced evaporative losses fromthe soil surface and acted asmulch. Park et al. (1996) reported that the seed yield of soybean was increased by 15% with black mulch. Tiwari et al. (1998) indicated that drip irrigation plus black plasticmulch increased the yield of okra by 72% compared to FI without mulch and 100% of irrigation requirement was met throughout.
  14. The total seed yield, branch number, pod number, plant height, harvest index and 1000 seed weight values of soybean under different irrigation treatments for the experimental years are given in Table 1. According to the analysis, there were statistically significant differences in average seed yield and yield components among treatments and between years. The highest average seed yield was observed for the WP1.0 treatment as 2260 and 2280 kg ha1, while the lowest yield was found for theWP0.5 treatment as 1345 and 1380 kg ha1 in 2003 and 2006, respectively. In both years, the seed yield for WP1.0 was 10% higher than that of FI and WP0.75, and 40% higher than that of WP0.50. Again, the maximum average branch number (3.2 per plant), pod number (69.2 per plant), plant height (69.2 cm), harvest index (37%) and 1000 seed weight (137 g) were obtained from the WP1.0 treatment, and this was statistically significantly different from the other treatments. The lowest values for all yield components were obtained from the WP0.50 treatment. All results were similar for 2003 and 2006. The study showed that thewater content in the root zone of the FI treatment plot was reduced from field capacity (32%) to wilting point (22.3%), whereas the water content in the WP1.0 and WP0.75 treatment plots remained well above the wilting range with a 10-day irrigation interval. Before irrigation, soil water content was always higher in the WP1.0 (25.5–27.1%) and WP0.75 treatment plots (23.7–24.5%) thanthat of the FI treatment plots (22.5–23.3%). Also, the water content of the WP0.50 treatment plot (21.4–22.4%)was close to that of the FI treatment plot (22.6–23.4%). These results agree with those reported by Li et al. (2004). In this study, higher water productivity accompanied by higher yields for the WP1.0 and WP0.75 treatments probably resulted from saving irrigation water through the mulchingeffectandreducedweeddensityascomparedto the FI method. Similar findings were reported by Bu¨ ku¨n et al. (2005), who stated that the black plastic pipe reduced evaporative losses fromthe soil surface and acted asmulch. Park et al. (1996) reported that the seed yield of soybean was increased by 15% with black mulch. Tiwari et al. (1998) indicated that drip irrigation plus black plasticmulch increased the yield of okra by 72% compared to FI without mulch and 100% of irrigation requirement was met throughout.
  15. The mean difference in soil temperature at a depth of 20 cm between the WP and FI treatments in 2003 and 2006 was similar, and the 2003 data are shown in Fig. 6. Although, there was a significant difference between WP and FI treatments (P < 0.01), there was no significant difference in soil temperature for the WP treatments during both seasons. When the WP treatments were compared to the FI treatment, the soil temperature at a depth of 20 cm was found to be significantly and consistently higher (P < 0.01) during both seasons. The mean soil temperature at a depth of 20 cm ranged from 33.1 to 30.5 8C in the WP treatments, whereas it changed significantly from 31.9 to 29.7 8C in the FI treatment (P < 0.01). The mean difference in soil temperature at a depth of 20 cm between the WP and FI treatments in 2003 and 2006 was similar, and the 2003 data are shown in Fig. 6. Although, there was a significant difference between WP and FI treatments (P < 0.01), there was no significant difference in soil temperature for the WP treatments during both seasons. When the WP treatments were compared to the FI treatment, the soil temperature at a depth of 20 cm was found to be significantly and consistently higher (P < 0.01) during both seasons. The mean soil temperature at a depth of 20 cm ranged from 33.1 to 30.5 8C in the WP treatments, whereas it changed significantly from 31.9 to 29.7 8C in the FI treatment (P < 0.01). The mean soil temperature difference between FI and WP treatments was 1.4 8C in 2003 and 2.0 8C in 2006. Generally, higher soil temperatures for the WP treatments observed in this study were in agreement with the results reported by Choi and Chung (1997), who observed an increase in soil temperaturesof 0.9–2.8 8C under black plastic mulch at a soil depth of 5 cm. The increase of soil temperature observed in the mulched plots compared with the unmulched plots also agreed with the findings reported by Park et al. (1996), who observed an increase of 0.8 8C under black film. Niu et al. (1998) reported that improved soil water and temperature with plastic mulches enhanced seedling emergence in spring wheat. From these reports and the highlighted benefits of mulch, it would be reasonable to expect that WP treatments are preferred to FI treatment. Similar to mulching, the plastic pipe applied in the present investigation gave several benefits, such as reducing soil evaporation and increasing water uptake, WUEand topsoil temperature.
  16. Rapid increases in population and demand for food have led to increased food production and more efficient use of agricultural land. Therefore, improved agricultural methods are always in demand. In this study, we showed that the WP irrigation method had significant effects on the growth and yield of soybean.WPirrigation at a suitable level is preferred to the FI method, as it saves water and maximizes yield with the same volume of water. Considering the IWUE and WUE,WP0.75 treatment is recommended in the case of water shortage. On the basis of the results of this research, it can be concluded that the WP method combines the advantages of both drip irrigation and mulching, restricts weed growth, decreases herbicide use and is suitable for organic farming. The WP system is economical to use and operate compared to the FI method. The effects of the WP method should also be considered among other management strategies in optimizing environmental conditions for plant growth. Further studies on the performance of the WP method for different crops, soils and climates remain to be evaluated.