Integrated effect of organic manures and inorganic fertilizers on productivity, NPK uptake and profitability of transplanted rice

An experiment was conducted at the Instructional Farm, Navsari Agricultural University, Navsari (Gujarat) during kharif seasons of 2012 and 2013 on transplanted rice under rice-greengram cropping sequence in randomized block design with five treatments replicated four times. The treatment imparted to rice crop was integrated nutrient management viz., T₁-General RDF (RDF: 100-30-00 kg N-P-K/ha+FYM @ 10 t/ha), T₂-75% RDN through chemical fertilizer+25% RDN through biocompost, T₃-75% RDN through chemical fertilizer+25% RDN through vermicompost, T₄-75% RDN through chemical fertilizer+25% RDN through FYM and T₅-Control. On the basis of pooled mean, the results indicated that application of general RDF (RDF+FYM @ 10 t/ha) recorded significantly highest grain and straw yields of rice as well as total NPK uptake by rice (grain and straw) than other treatments followed by 75% RDN through chemical fertilizer+25% RDN through vermicompost. However, maximum net returns and benefit ratio were noted with the application of 75% RDN through chemical fertilizer+25% RDN through biocompost followed by general RDF (RDF+FYM @ 10 t/ha).