FERTILIZER PRESCRIPTION EQUATIONS FOR TARGETED YIELD OF RICE (Oryza Sativa .L) AND THEIR VALIDATION UNDER AEROBIC CONDITION
Journal Title: International Journal of Agriculture Sciences - Year 2016, Vol 8, Issue 4
Abstract
Field experiments were conducted in soils (Typic Rhodostalfs) of Mandya (Zone 6), Karnataka by adopting the inductive cum targeted yield model, and fertilizer requirements were quantified for rice crop under puddled condition based on soil test crop response correlations. The data obtained from main experiment were used to compute nutrient required to produce a quintal of grain (NR), per cent contribution of nutrients from the soil (% CS), per cent contribution of nutrients from fertilizers (% CF) and per cent contribution of nutrients from organic matter (% C-OM). From these basic parameters fertilizer prescription equation was developed under an integrated plant nutrient system. The developed equation was verified under aerobic condition in the same zone. The results revealed that grain yield was significantly higher (65.73 q ha-1) in STCR integrated approach with 75 q ha-1 target. The same trend was observed with an agronomic nutrient efficiency of nitrogen, phosphorus and potassium. However, higher value cost ratio (VCR) was observed in STCR inorganic approach with 50 q ha-1 target was due to application of lower doses of NPK without FYM application, which reduced the cost of inputs and the cost of cultivation which in turn directly influenced the VCR. The study clearly indicated targeted yield equation developed under puddled condition can be well adopted for both wet land and aerobic conditions of Karnataka.
Authors and Affiliations
P. K. BASAVARAJA
Keywords
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