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Effects of Varied Nitrogen Levels and Plant Populations on yield Response of NERICA 1 Variety

Effects of Varied Nitrogen Levels and Plant Populations on yield Response of NERICA 1 Variety Presented at NIB forum By Oyange A. Wilson - RiceMAPP on 14.6.2013. Introduction. Trend of cultivation expansion is towards upland ecosystem, where 80% of farmers earn their living

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Effects of Varied Nitrogen Levels and Plant Populations on yield Response of NERICA 1 Variety

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  1. Effects of Varied Nitrogen Levels and Plant Populations on yield Response of NERICA 1 Variety Presented at NIB forum By Oyange A. Wilson - RiceMAPP on 14.6.2013

  2. Introduction • Trend of cultivation expansion is towards upland ecosystem, where 80% of farmers earn their living • NERICAs have shown potential in both L/land & U/land ecosystems; yields & stress tolerance • For optimum yields, N application at appropriate spacing enhances morphological characteristics & optimizes yield • Many farmers still don’t consider planting density as an important factor in rice productivity • 80% hence plant at random & apply less fertilizers • Work focused on response to N levels & spacings.

  3. Statement of the problem • Rice production is low and production hardly meets 50% of the demand • There is a shift in consumption from maize to rice with demand growing at 12% per annum • 80% of rice grown in Lowland and 20% in upland ecosystem. • Land expansion static in irrigated areas

  4. Specific objectives • To determine the effect of different N application rates on grain yield of NERICA 1 • The effect of different planting densities on growth and grain yield of NERICA1 • Any interaction between density and N levels in relation to NERICA 1 grain yield and yield components

  5. MATERIALS AND METHOD • The experiment was done at MIAD center and KARI • Rainfall: bimodal, 930mm, and 510mm, 66% reliable • Temperature ave. 22oC, Min - 17 & max – 28 oC • Analysis done for soil, plant nutrients and weather data taken for the period. • NERICA 1 variety was used at 3 Fertilizer levels of 0, 60 and 120kg ha-1 & 3 spacingsof 30x15, 25x15 &20x15 cm • The trial was a 3x3 factorial in split plot design with 3 replications, total 27 plots, each 3x3m

  6. Treatments and treatment combinations Where ; F1- 0kg N ha-1, F2-60kg N ha-1, F3- 120kg N ha-1: S1- 30x15cm, S2- 25x15cm, S3- 20X15cm

  7. Data collection • Growth parameters; Plant height, Tillers, SPAD, Culm length, • Yield parameters: Panilcesm-2, spikeletspanicle-1, 1000 gwt, %filling, HI • P&D assessments • Time line: 21, 30, 45, 55,75 & 110 DAT • Analysis: LSD used to separate means separated at 5% sig

  8. Weather • R/f: 176mm < 20mm/wk

  9. Soils Nutrient • Adapted from MIAD laboratory • N, < 0.25% recommended, supply41%, 35kg/ha rqt equivalent • P = 71 % of requirement, equivalent to 45kg/ha (P2O5) requirement • K20= 35% requirement, equivalent to 25kg/ha K2O • PH= 6.65 Max P avail.

  10. Results • Plant height N on Plant ht spacing on Plant ht N levels on plant height Spacing on plant height

  11. 1. Tillers Tillers Vs Spacing Tillers Vs N Levels N effect on tillers Spacing on tillers

  12. 3. Panicle length Effect of Nitrogen on P/length Effect of spacing on P/length * There is an Interaction

  13. 4. Culm length Effect of N on culm lenth Effect of spacing on culm length N on culm length

  14. 5. Panicles m-2 N levels & Spacing on P m-2 N on p m-2 spacing on Pm-2 * There is an interaction

  15. 6. Spikelets panicle-1 • N & Spacing on Spikelets/panicle N on spikelets/panicle

  16. 7. % filled grains Effect of N & spacing on % filled grains N on % filled grains spacing on % filled grains *Interaction

  17. 7. Grain wt N levels on grain wt

  18. 9. Yield N & spacing on yield

  19. Conclusion • Nitrogen level of 60 kg N ha-1 at 20 x 15cm spacing gives optimum yields hence better for NERICA 1 farmers • Harvesting at more than 110 DAT can possibly increase the % filling & grain yield at high N levels • Tillers per m2, spikelet per panicle and 1000 grain weight increased to optimum levels at 60 kg ha-1. A possibility of higher optimum levels should be tested at between 100-120 kg N ha-1. • Delayed effect of Nitrogen on maturity partly contributed to the reduction in percentage of filled grains with increased N levels.

  20. Polyethene sheathing on plots to prevent lateral seepage of nutrients ; 1.12.2012 followed by transplanting on 5.12.2012

  21. NERICA crop at NERICA TRIAL SITE ON 6/2/2012: 60 DAT; Crop at Panicle initiation stage; less than 3% headed

  22. NERICA crop at 80DAT; heading; 23.2.2013

  23. NERICA crop at 80DAT; heading; 23.2.2013

  24. Schedule of activities

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