Integrated Nutrient Management by Using Target Yield Equations for Rice-Jute System in Eastern India
2008
Ghosh, A.
Field studies on target yield equation (TYE)-based integrated nutrient management in rice (Oryza sativa) and jute (Corchorus capsularis) were conducted to investigate its value in achieving target yields, improving nutrient utilization and soil nutrient status. The study was conducted for 3 years consecutively during 2001 to 2003 under on-farm rainfed conditions growing rice variety Padmini in sequence with jute variety JRO 524 during wet season (April to December). Requirement of nitrogen (N) phosphorus (P), and potassium (K) for achieving target yield of 4 t ha-1 for rice and 3 t ha-1 for jute was estimated following a soil test crop response (STCR)-based TYE. Four sets of treatments included farmyard manure (FYM) as organic source and synthetic fertilizers as chemical source applied to both rice and jute, compared with an untreated crop (no NPK) usually followed in farmers' practice. Results showed marginal deviation from specified target yield, achieving 96% of the target yield in rice and 95% in jute. Integrated nutrient management resulted in significantly higher yield of both rice (3.84 t ha-1) and jute (2.85 t ha-1), treated with 100% INM combined with 75% fertilizer NPK + 25% organic N. As a result, the system productivity aggregating rice and rice equivalent yield of jute was also highest (8.97 t ha-1) with 100% INM. A benefit:cost ratio was also derived, showing a maximum of 1.04 in rice with 100% INM, compared with 0.96 with the application of fertilizer alone. Nutrient uptake and nutrient productivity were also higher in crops with 100% INM. In addition, sustained availability of soil N, P, and K (and thereby, improvement in soil nutrient balance), was pronounced more with 100% INM. Therefore, the 3-year on-farm study showed that TYE-based INM not only helped achieve near-target yields but also promoted nutrient utilization and sustainable soil NPK status.
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