Author(s): Pallavi Bharti, Akhila Nand Dubey, Shivam Singh, Richa Raghuvanshi and Jagannath Pathak

Abstract: The study was conducted on the AICRP-IFS experiment located at BAU, Sabour having twelve treatments with four replications in randomized block design having 25 to 50% of nitrogen substitution through different organics viz, FYM (Farmyard manure), GM (Green manure) and WS (wheat straw) under long term effect with rice-wheat cropping system affecting physic-chemical properties of soil was studied. After the analysis of soil samples a significant reduction in soil pH was observed from its initial value of 7.40 to 7.25, organic carbon build up from 0.46% to 0.87%, available N from 194.00 to 269.91 kg ha^-1, available P₂O₅ from 23.60 to 46.91 kg ha^-1 and available K₂O from 0.75 to 184.44 kg ha^-1 respectively due to long term 35 years of INM practices under rice-wheat in alluvial soil. Substitution of 50% and 25% N through organics either by FYM/GM/WS showed a significant increase in the DTPA- extractable Zn, Cu, Fe and Mn of post harvest soil after 35 years of the experiment.

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