Evaluation of Rice (Oryza sativa L.) under integrated nitrogen management practices and succeeding maize (Zea mays L.) under residual nutrient and weed management practices

Abstract

A field experiment was conducted at Central Research Station of the College of Agriculture, OUAT, Bhubaneswar, during two consecutive kharif and rabi seasons of 2017-18 and 2018-19 to study the influence of integrated nitrogen management practices on rice and its residual effects on growth, yield attributes and yield of maize with different weed management practices. The field experiment was laid out in a RBD design for rice with four treatments and 15 replications and split-plot design for maize with three replications. The four Integrated nitrogen management (INM) treatments for rice were D1=100% STBN (Soil test based nitrogen) D2=50%STBN+50%FYM, D3=50%STBN+50%VC and D4=50%STBN+50%PM. Maize is taken as the succeeding crop grown with RDF (120-60-60Kg/ha, N-P-K respectively). There were altogether 20 treatment combinations for maize with Main Plot (Nutrient management, i.e. residual nutrients of rice crop) and Sub-Plot (Weed management): W1= Topramezone@25g a.i./ha, W2=Tembotrione@105g a.i./ha,W3=Topramezone@25g a.i. + Atrazine@ 250g a.i./ha as tank mix, W4=Tembotrione@105g a.i./ha + Atrazine@ 250g a.i./ha and W5=Weedy check. Rice yield was found to be maximum under 50% STBN+ 50% VC followed by 50% STBN+ 50% PM. The residual effects of these nutrients practices have found to be influence the growth and yield of succeeding maize crops. Among the nutrient management practices, 50% STBF+ 50% VC gives the highest kernel yield (6.36t/ha) and among the weed management practices combined application of Topramezone@25g a.i. +Atrazine@ 250g a.i./ha as tank mix resulted the maximum kernel yield (7.18t/ha) over both the years. Highest kernel yield of maize, 7.59t/ha was recorded in the treatment combination, comprising 50%STBN+50%VC with Topramezone@25g a.i. +Atrazine@ 250g a.i./ha as tank mix application in maize at 15 DAS.