Soil test based integrated fertilizer prescription for targeted green pod yield of cowpea

Soil test crop response correlation studies were carried out following Ramamoorthy's ‘inductive-cum-targeted yield’ model on an Inceptisol for the development of integrated fertilizer prescription for targeted yield of green cowpea pod. The computed basic parameters viz., nutrient requirement (NR) and per cent contributions of nutrients from soil (CS), fertilizer (CF), and farm yard manure (CFYM) were used for the formulation of N, P and K fertilizer prescription equations. The per cent contribution of N, P and K from soil, fertilizer and farm yard manure (FYM) were 69.2, 145.2 and 17.3 for nitrogen; 63.6, 24.4 and 9.7 for phosphorus and 56.1, 79.5 and 22.1 for potassium, respectively. These parameters were used to prepare the ready reckoners of fertilizer prescription for the range of soil test values of N, P and K for desired yield target (± 5 to ± 10% of potential yield of the variety) of green cowpea pod.