Effect of Integrated nutrient management on transplanted rice (Oryza sativa) and its residual effect on succeeding wheat (Triticum aestivum) crop in rainfed lowlands

A field experiment was conducted during 1995-97 at Ghaghraghat Uttar Pradesh to study the effect of integrated nutrient management on rice (Oryza sativa L.) and residual effect on succeeding wheat (Triticum aestivum L. emend. Fiori & Paol.). Application of 50% of recommened dose of nitrogen (RDN) through inorganic fertilizer (IF) + dhaincha (Sesbania aculeata L.) @ 2.5 tonnes/na to note gave significantly higher mean grain yield of rice (31.8 q/ha) and wheat (28.4 q/ha) over rest of the treatments except 50% RDN.IF+PM @ 5 tonnes/na in rice. The yield of succeeding wheat increased by 43.1 to 48.9% because of integrated use over the control. Rice fertilized with 75% RDN through inorganic fertilizer (IF) + blue green algae (BGA @ 16 kg/ha) resulted in significantly higher grain yield over 75% RDN-IF+BGA @ 12 kg/ha during both the years. Application of ZnSO4 with full RDF resulted significantly higher yield of rice and succeeding wheat as compared to full RDF alone through inorganic fertilizers. There was a build-up of available N, P, K and organic carbon in soil in all integrated nutrient management practices except full RDF alone and RDF + ZnSO4. The bulk density and pH reduced under in all nutrient management practices.