Soil Test Based Fertilizer Recommendation of Nitrogen, Phosphorus and Sulphur in Wheat (Triticum aestivum L.) in an Alluvial Soil

摘要

Soil test crop response correlation involving integrated plant nutrition system (STCR-IPNS) studies on nitrogen (N), phosphorus (P) and sulphur (S) in wheat on an Inceptisol, New Delhi, India were carried out following Ramamoorthy’s ‘inductive cum targeted yield model’. After establishment of marked fertility gradient with respect to soil available N, P and S, four levels of fertilizer N, P,S and three levels of farmyard manure (FYM) were randomized in three fertility strips each having twenty four plots. Soil and plant analysis data were further used to compute basic parameters required for development of nutrient prescription equation. The nutrient requirement for producing one quintal of wheat grain yield was worked out as 2.26 kg of N, 0.40 kg of P and 0.54 kg of S. Soil available pool contributed 26.15,50.06 and 52.55 % to total N, P and S uptake, respectively; contribution from applied fertilizer were 42.31,25.12 and 46.39% and contribution from applied FYM were 27.95,11.21 and 17.66% to total N, P and S uptake by wheat. Using basic data, fertilizer prescription equations and ready reckoner were developed for range of soil test values and desired yield targets for NPS alone and IPNS (NPS with FYM).