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Authors : Kakali Konwar*, Abhijit Sarma, J.C. Das, R.K. Thakuria,
Kalyan Pathak, B.K. Medhi and Kushal Sarmah
*kakalikonwar001@gmail.com
Department of Agronomy, Assam Agricultural University,
Jorhat– 785013, Assam, India
Increasing the productivity of rapeseed through the
practice of system of rapeseed intensification

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INTRODUCTION
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 System of rapeseed intensification utilizes
early seedling vigour for early, quick and
healthy plant establishment.
 One plant per hill is maintained to avoid
root competition.
 Plants are widely spaced to encourage
greater root and canopy growth.

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OBJECTIVE
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To optimize the irrigation schedule under system
of rapeseed intensification
To evaluate the most suitable planting geometry
under system of rapeseed intensification

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Materials and Methods

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Location : Instructional-cum-Research
Farm, AAU, Jorhat
Latitude : 26°47 N
Longitude : 94°12 E
Altitude : 87.0 meters above mean sea
level
Variety : TS 38

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Treatment :
Irrigation scheduling :
I1 = At pre-flowering (20 DAS)
I2 = At pre-flowering (20 DAS), and at flowering
(40 DAS)
I3 = At pre-flowering (20 DAS), at flowering
(40 DAS), and at siliqua development(60 DAS)
I4 = Rainfed
Planting geometry :
S1 = 30 cm x 30 cm
S2 = 30 cm x 25 cm
S3 = 25 cm x25 cm
S4 = 30 cm x 5-7 cm
Design : Split plot with 3 replications

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Table 1. Initial physical properties of soil
Parameters
Depth of soil profile
Methods employed
0-20cm 20-40cm
Texture Sandy loam Sandy loam International pipette
Mmthod
Bulk density (g/cc) 1.41 1.49 Core sampler method
Particle density (g/cc) 2.53 2.59 Pycnometer method
Total porosity (%) 44.26 42.57 Keen-Rackzowski box or
Hillgard apparatus
MWHC (%) 42.18 40.52
Field capacity (%) 27.45 27.71
Pressure plate apparatus
Permanent wilting
point (%)
9.56 9.65
Hydraulic conductivity
(cm/hr)
0.48 0.35 Constant head method

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Soil property Value Method used
pH 5.2 1:2.5 soil water suspension, glass
electrode, pH meter method (Jackson,
1973)
Organic carbon (%) 0.72 Wet digestion method (Walkey and
Black, 1934)
Available N (kg/ha) 181.0 Kjeldahl method (Jackson, 1973)
Available P2O5 (kg/ha) 24.5 Bray- I method (Jackson, 1973)
Available K2O (kg/ha) 120.5 Flame photometer method (Jackson,
1973)
Table 2. Initial chemical properties of the soil (0-15 cm)

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0
10
20
30
40
45 46 47 48 49 50 51 52 1 2 3 4 5
Max. temp. (⁰C) Min. temp. (⁰C)
Standard Meteorological week
Temperature(⁰C)
0
20
40
60
80
100
120
45 46 47 48 49 50 51 52 1 2 3 4 5
RH (morning) RH (evening)
Standard Meteorological week
RelativeHumidity(%)
Fig.1. Meteorological data during the crop growth period
0
5
10
15
20
45 46 47 48 49 50 51 52 1 2 3 4 5
Rainfall (mm) Evap (mm) BSSH (hrs/day)
Standard Meteorological week
Rainfall,Evap,BSSH

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Results and Discussion

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0
5
10
15
20
20-40 DAS 40-60 DAS 60-80 DAS 80 DAS-
Harvest
I1 I2 I3 I4
CGR(g/m2/day)
0
5
10
15
20
20-40 DAS 40-60 DAS 60-80 DAS 80 DAS-
Harvest
S1: 30 cm × 30 cm S2: 30 cm × 25 cm
S3: 25 cm × 25 cm S3: 30 cm × 5-7 cm
CGR(g/m2/day)
Fig.2. Crop growth rate (CGR) as influenced by irrigation and planting geometry

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0
50
100
150
200
20-40 DAS 40-60 DAS 60-80 DAS 80 DAS-
Harvest
I1 I2 I3 I4
RGR(mg/g/day)
0
50
100
150
200
20-40 DAS 40-60 DAS 60-80 DAS 80 DAS-
Harvest
S1: 30 cm × 30 cm S2: 30 cm × 25 cm
S3: 25 cm × 25 cm S3: 30 cm × 5-7 cm
RGR(mg/g/day)
Fig.2. Relative growth rate (RGR) as influenced by irrigation and planting geometry

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PHOTOGRAPHIC EVIDENCE
Fig 1 : During field preparation Fig 2 : Crop before thinning
Fig 3 : Crop after thinning Fig 4 : Crop at pre-flowering stage(20 DAS)

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Fig 5 : Crop at flowering stage(40 DAS) Fig 6 : Crop at siliqua development stage(60 DAS)
Fig 7 : SRI rapeseed crop vs normal sown crop

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Table 3. Effect of different irrigation scheduling and planting
geometry on seed and stover yield of toria
Treatment
Seed yield
(kg ha-1)
Stover yield
(kg ha-1)
Irrigation scheduling (I)
I1 : Irrigation at pre-flowering 1421 2644
I2 : Irrigation at pre-flowering and flowering 1612 2966
I3 : Irrigation at pre-flowering, flowering and
siliqua development
1703 3067
I4: Rainfed 1104 2098
CD (P = 0.05) 152 279
Planting geometry (S)
S1: 30 cm × 30 cm 1413 2675
S2: 30 cm × 25 cm 1475 2801
S3: 25 cm × 25 cm 1598 2844
S4: 30 cm × 5-7 cm 1355 2435
CD (P = 0.05) 116 160
Interaction NS NS

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Table 4. Effect of different irrigation scheduling and planting
geometry on total water use and water use efficiency
Treatment
Total water
used
(mm)
Crop WUE
(kg ha-cm-1)
Field WUE
(kg ha-cm-1)
Irrigation scheduling (I)
I1 : Irrigation at pre-flowering 139.4 117.9 102.0
I2 : Irrigation at pre-flowering and
flowering
200.3 121.4 80.5
I3 : Irrigation at pre-flowering,
flowering and siliqua development
241.7 123.5 70.5
I4: Rainfed 95.0 116.2 116.2
Planting geometry (S)
S1: 30 cm × 30 cm 170.1 116.3 83.1
S2: 30 cm × 25 cm 172.6 121.4 85.5
S3: 25 cm × 25 cm 173.6 128.4 92.1
S4: 30 cm × 5-7 cm 160.1 114.1 84.7

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Table 5. Effect of different irrigation scheduling and planting
geometry on monetary return
Treatment
Total Cost
(Rs /ha)
Gross return
(Rs /ha)
Net return
( Rs/ha)
Benefit
cost ratio
Irrigation scheduling (I)
I1 26,851 50,019 23,168 1.86
I2 27,451 56,742 29,291 2.07
I3 27,864 59,945 32,081 2.15
I4 26,251 38,860 12,609 1.48
Planting geometry (S)
S1 25,568 49,738 24,170 1.95
S2 27,354 51,920 24,566 1.90
S3 29,209 56,249 27,040 1.93
S4 26,288 47,696 21,408 1.81

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CONCLUSION
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 Three irrigations at pre-flowering, flowering,
and siliqua development stages, with planting
geometry at 25 x 25 cm, is the most
advantageous to farmers for better yield, more
water use efficiency, and higher monetary return.
SRI practice increased 18% yield in rapeseed
over line sowing.
Net economic return of I3 = 2.66 x 14 (rainfed)

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Thank You