1Indian Council of Agricultural Research Research Complex for Goa, Ela, Old Goa, India,
2Division of Soil Science and Agricultural Chemistry, Indian Agricultural Research Institute, New Delhi, India
3Division of Agronomy, Indian Agricultural Research Institute, New Delhi, India
4Division of Agricultural Physics, Indian Agricultural Research Institute, New Delhi, India
5Division of Designs of Experiment, Indian Agricultural Statistical Research Institute, New Delhi, India
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).
Basic parameters - nutrient requirement, contribution from soil, fertilizer and farmyard manure in wheat computed. Fertilizer prescription equation and ready reckonerfor N,P and S recommendations developed
Fertilizer prescription equations, Triticum aestivum L, soil test crop response, targeted yield approach
