National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Understanding the nutrient management strategies shape soil phosphorus (P) speciation and crop responses is essential for sustaining productivity in Vertisol-dominated rice–wheat systems. Objectives were to quantify changes in soil P fractions, relate P fractions to P uptake and available P, and assess yield responses under varying P regimens. A factorial design with five treatments and four replications tested inorganic NPK doses, STCR-based yield targets (14, 18, and 22 q ha–1), and FYM. Soil samples were analyzed for major inorganic P fractions using sequential fractionation, while plant tissue and grain yields were measured to compute nutrient uptake. Results show that STCR-based doses targeting 22 qha–1 produced the highest grain yield and corresponded with elevated total P uptake and selective P fractions. Ca–P and Red–P dominated the inorganic P pool, with Fe–P, Al–P, and Saloid–P contributing variably across treatments. FYM generally enhanced nutrient use efficiency and amplified certain P pools, though FYM–fertilizer interactions were context-dependent. Total P and its fractions increased with cumulative P inputs, augmenting P availability and uptake in both rice and wheat. The highest Ca–P and Red–P stocks accompanied higher yields, illustrating a link between P partitioning and productivity.
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