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1830 - Increasing productivity of rapeseed through the practice of System of Rapeseed Intensification

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Authors: Kakali Konwar*, Abhijit Sarma, J.C. Das, R.K. Thakuria, Kalyan Pathak, B.K. Medhi and Kushal Sarmah
Title: Increasing the productivity of raperseed through the practice of System of Rapeseed Intensification
Date: December 2018
Venue: Assam Agricultural University, Jorhat, Assam, India
Presented at: The International Conference on Climate Change, Biodiversity and Sustainable Agriculture
Date: December 13-16, 2018

Published in: Environment
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1830 - Increasing productivity of rapeseed through the practice of System of Rapeseed Intensification

  1. 1. 1 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
  2. 2. INTRODUCTION 2  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.
  3. 3. OBJECTIVE 3 To optimize the irrigation schedule under system of rapeseed intensification To evaluate the most suitable planting geometry under system of rapeseed intensification
  4. 4. 4 Materials and Methods
  5. 5. 5 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
  6. 6. 6 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
  7. 7. 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
  8. 8. 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)
  9. 9. 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
  10. 10. 10 Results and Discussion
  11. 11. 11 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
  12. 12. 12 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
  13. 13. 13 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)
  14. 14. 14 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
  15. 15. 15 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
  16. 16. 16 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
  17. 17. 17 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
  18. 18. CONCLUSION 18  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)
  19. 19. 19 Thank You

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