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Dr Bill Cotching Dr
Marcus Hardie
Water for Profit
Readily available water storage & irrigation interval
Duplex soils Gradational
soils
Ferrosols
Hydrosol
Duplex soils Gradational
soils
Ferrosols
Hydrosol28 – 42
mm
17 – 20
mm
16 – 26
mm
18 - 25
mm
42 mm
Sandy loams Clay loams
Big
water storage
28 – 42 mm Small
water storage
17 – 20 mm
Small
water storage
16 – 26 mm
9 farms
5 farms 5 farms
RAW in root zone
Soil structure ?
28 – 42
mm
16 – 26
mm
Duplex soils
Drainable porosity = large soil pores
Duplex soils
Drainable porosity = large soil pores
Good
Not good
RAW’s are different on different soils.
So what for irrigation interval
Soil type RAW
mm
Daily ET0
(November - March)
mm
Campania Fingal Cressy Smithton
Duplex sandy loam 28 - 42 4.4
Duplex sandy loam 17 - 20 4.2
Gradational 16 - 26 4.5
Ferrosol 18 - 25 3.7
Hydrosol 42 3.7
Soil type RAW
mm
Daily ET0
(November - March)
mm
Irrigation
interval
days
Campania Fingal Cressy Smithton
Duplex sandy loam 28 - 42 4.4 6 - 10
Duplex sandy loam 17 - 20 4.2 4 - 5
Gradational 16 - 26 4.5 4 - 6
Ferrosol 18 - 25 3.7 5 - 7
Hydrosol 42 3.7 11
Soil type RAW
mm
Daily ET0
(November - March)
mm
Irrigation
interval
days
Daily Et0
Max
mm
Campania Fingal Cressy Smithton
Duplex sandy loam 28 - 42 4.4 6 - 10 9.9
Duplex sandy loam 17 - 20 4.2 4 - 5 8.6
Gradational 16 - 26 4.5 4 - 6 8.8
Ferrosol 18 - 25 3.7 5 - 7 6.4
Hydrosol 42 3.7 11 6.4
ETc and crop coefficient
Crop Kc ini Kc mid Kc end
Pasture 0.4 0.85-1.05 0.85
Broccoli 0.7 1.05 0.95
Carrots 1.05 0.95
Potato 1.15 0.75
Beans 0.5 1.05 0.9
Lucerne 0.4 1.2 0.95
Source - http://www.fao.org/docrep/X0490E/x0490e0b.htm
Crop coefficients, Kc, for non stressed, well-managed crops for use with
the FAO 56 Penman-Monteith ETo.
Irrigation system capacity
• The system capacity is the maximum
possible rate at which the machine can
apply water to the irrigated field area
• Expressed in mm/day - NOT the depth
applied per pass (mm)
)(mareairrigatedField
(L/day)rateflowpumpDaily
CapacitySystem 2

The Green Drought
How wet does your soil have to be
to be ‘full’ ?
36 – 44 %
48 % 48 %
Duplex soils Gradational
soils
Ferrosols
Hydrosol
Topsoil water content at field capacity
(full after irrigation)
17 % 17 %
Topsoil water content at irrigation start up
17 % 17 %
25 %
Topsoil water content at irrigation start up
17 % 17 %
25 %
32 %
37 %
Topsoil water content at irrigation start up
Readily available water storage & irrigation interval
 RAW varies a lot, even on the same soil type
(17 – 42 mm in top 30 cm of sandy loams)
 RAW, crop ET & irrigation system capacity
all determine irrigation interval
 Soil water content at ‘full point’ is surprisingly wet
And also at ‘refill’ point on many soils
(17, 25, 32, 37 % on sandy loams)

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Summary of soil results | Water for Profit

  • 1. 1 Dr Bill Cotching Dr Marcus Hardie Water for Profit Readily available water storage & irrigation interval
  • 2.
  • 3.
  • 4.
  • 6. Duplex soils Gradational soils Ferrosols Hydrosol28 – 42 mm 17 – 20 mm 16 – 26 mm 18 - 25 mm 42 mm
  • 7. Sandy loams Clay loams Big water storage 28 – 42 mm Small water storage 17 – 20 mm Small water storage 16 – 26 mm 9 farms 5 farms 5 farms RAW in root zone
  • 8. Soil structure ? 28 – 42 mm 16 – 26 mm Duplex soils
  • 9. Drainable porosity = large soil pores Duplex soils
  • 10. Drainable porosity = large soil pores Good Not good
  • 11. RAW’s are different on different soils. So what for irrigation interval
  • 12. Soil type RAW mm Daily ET0 (November - March) mm Campania Fingal Cressy Smithton Duplex sandy loam 28 - 42 4.4 Duplex sandy loam 17 - 20 4.2 Gradational 16 - 26 4.5 Ferrosol 18 - 25 3.7 Hydrosol 42 3.7
  • 13. Soil type RAW mm Daily ET0 (November - March) mm Irrigation interval days Campania Fingal Cressy Smithton Duplex sandy loam 28 - 42 4.4 6 - 10 Duplex sandy loam 17 - 20 4.2 4 - 5 Gradational 16 - 26 4.5 4 - 6 Ferrosol 18 - 25 3.7 5 - 7 Hydrosol 42 3.7 11
  • 14. Soil type RAW mm Daily ET0 (November - March) mm Irrigation interval days Daily Et0 Max mm Campania Fingal Cressy Smithton Duplex sandy loam 28 - 42 4.4 6 - 10 9.9 Duplex sandy loam 17 - 20 4.2 4 - 5 8.6 Gradational 16 - 26 4.5 4 - 6 8.8 Ferrosol 18 - 25 3.7 5 - 7 6.4 Hydrosol 42 3.7 11 6.4
  • 15. ETc and crop coefficient Crop Kc ini Kc mid Kc end Pasture 0.4 0.85-1.05 0.85 Broccoli 0.7 1.05 0.95 Carrots 1.05 0.95 Potato 1.15 0.75 Beans 0.5 1.05 0.9 Lucerne 0.4 1.2 0.95 Source - http://www.fao.org/docrep/X0490E/x0490e0b.htm Crop coefficients, Kc, for non stressed, well-managed crops for use with the FAO 56 Penman-Monteith ETo.
  • 16. Irrigation system capacity • The system capacity is the maximum possible rate at which the machine can apply water to the irrigated field area • Expressed in mm/day - NOT the depth applied per pass (mm) )(mareairrigatedField (L/day)rateflowpumpDaily CapacitySystem 2 
  • 18. How wet does your soil have to be to be ‘full’ ?
  • 19. 36 – 44 % 48 % 48 % Duplex soils Gradational soils Ferrosols Hydrosol Topsoil water content at field capacity (full after irrigation)
  • 20. 17 % 17 % Topsoil water content at irrigation start up
  • 21. 17 % 17 % 25 % Topsoil water content at irrigation start up
  • 22. 17 % 17 % 25 % 32 % 37 % Topsoil water content at irrigation start up
  • 23. Readily available water storage & irrigation interval  RAW varies a lot, even on the same soil type (17 – 42 mm in top 30 cm of sandy loams)  RAW, crop ET & irrigation system capacity all determine irrigation interval  Soil water content at ‘full point’ is surprisingly wet And also at ‘refill’ point on many soils (17, 25, 32, 37 % on sandy loams)