Fertilizer requirement of wheat (Triticum aestivum) for pre-set yield targets in an Inceptisol of mid-western plain zone of Uttar Pradesh.

An experiment on soil test crop response (STCR) correlation studies was conducted in Inceptisols of Varanasi, Uttar Pradesh during rabi 2010-11. Using the basic data, fertilizer adjustment equations have been developed for prescribing optimum fertilizer doses to attain different yield targets. The nutrient requirement of N, P2O5 and K2O was found to be 1.95, 0.42 and 2.47 kg/q, respectively, for producing one quintal of wheat. The per cent nutrient contributions from soil were 8.63, 8.03 and 12.48, and from fertilizers were 61.44, 58.74 and 188.17% for N, P2O5 and K2O, respectively. The targeted yield equations and the fertilizer ready reckoner developed for wheat will be useful for large scale recommendation by the soil testing laboratory of eastern Uttar Pradesh.