Effect of levels of phosphorus and solubilization of rock phosphate by spent wash on physico-chemical properties of soil by wheat (Triticum aestivum L.) In an inceptisol

Abstract

The experiment were conducted field experiment at Agriculture Research Farm, Institute of Agricultural Science during 2014-15 and 2015-16. The experiments comprising five levels of phosphorus (control, 100% Recommended dose of N & K +50% P through SSP, 100% Recommended dose of N & K +75% P through SSP, 100% Recommended dose of N & K +50% P through rock phosphate and 100% Recommended dose of N & K +75% P through rock phosphate) in main plots and four levels of solubilization of rock phosphate treatments (control, RP:SW@1:10, RP:SW@1:40 and RP:SW@1:80) in sub-plots thereby making twenty treatment combinations were tested in split plot design with three replications. The variety HUW-468 (wheat) was sown in rows spaced at 22.5 cm, using the seed of 100 kg ha-1. Results revealed indicate that solubilization of rock phosphate remained at par with RP:SW@1:80 but recorded significantly higher EC (dSm-1), OC (%) and available N, P, K and S in soil as compared to remaining levels of rock phosphate and control and Results further indicate that solubilization of rock phosphate remained at par with RP:SW@1:80 but recorded significantly lower pH as compared to remaining levels of rock phosphate and control. Results revealed that application of 100% N&K + 75% P through SSP recorded significantly The application of 100% N&K + 75% P through SSP also recorded highest available N, P, K and S in soil found significantly superior to their lower levels.