Grain yield and soil nutrient status of rice - rice cropping system as influenced by nutrient management under long term fertiliser experimentation

Long Term Fertilizer Experiments were conducted since Kharif 2000 at Regional Agricultural Research Station, Jagtial, Acharya N.G. Ranga Agricultural University in rice – rice cropping system. Results indicated that application of 150% NPK recorded significantly higher grain yield and post harvest available nutrients (N, P and K) followed by combined application of 100% NPK and FYM @ 10 t ha−1. Soil properties like pH and electrical conductivity did not significantly vary due to different nutrient management. While soil organic carbon content increased over initial value in all the treatments with consistent higher values in organic manure (FYM) applied plots either alone or in combination with inorganic fertilizers. Among the available soil nutrients, phosphorous build up was observed in the plots consisting of P application and it was highest in the plots applied with 150% NPK (116% build up from the initial) on the other hand depletion was observed in plots with no P application.