Productivity, nutrient uptake and nutrient use efficiency of summer rice (Oryza sativa) as influenced by integrated nutrient management practices

Abstract

Rice is the staple food crop of India and for sustainable production of rice integrated nutrient management is advised. In this regard, a field experiment was conducted during summer season of 2019–20 at Bagusala Farm (23o39’N latitude and 87o42’E longitude) of M.S. Swaminathan School of Agriculture, Gajapati, Odisha under sandy clay loam soil conditions. The experiment was laid out in Randomized Block Design with three replication and eight treatments. The treatments were 100% RDN (recommended dose of nitrogen), 75% RDN+25% N through vermicompost, 75% RDN+25% N through FYM (farmyard manure), 50% RDN+50% N through vermicompost, 50% RDN+50% N through FYM, 50% RDN+25%N through vermicompost+25% N through FYM, 25% RDN+ 25% N through vermicompost + 50% N through FYM, control (no fertilizer).The rice variety RNR 15048 was used. The treatments with 75% RDN along with 25% vermicompost recorded better results in terms of yield attributes, namely, number of panicle/m2 (213.3), panicle length (24.5 cm), number of spikelets/panicle (140.7), number of filled grain/panicle (123.3) and grain and straw yields (5.18 t/ha and 7.31 t/ha respectively).The uptake of nitrogen (N), phosphorous (P) and potassium (K)by rice was more (85.6, 28.1 and 128.7 kg/ha respectively) with 75% RDN+25% N through vermicompost and the treatment also showed maximum value of N (255.0 kg/ha), P (16.7 kg/ha) and K (144.0 kg/ha) in postharvest soil. From the present study it may be recommended that integrated nutrient management in summer rice in south Odisha involving application of 75% RDN with 25% N through vermicompost can be opted for improving productivity and sustainability.