Direct and residual effect of integrated nutrient and weed management in transplanted rice Oryza sativa L zero till mustard Brassica juncea L Czern and Coss

Abstract

A field experiment entitled Direct and residual effect of integrated nutrient and weed newlinemanagement in transplanted rice [Oryza sativa (L.)]- zero till mustard [Brassica juncea (L.) Czern and newlineCoss] was conducted during kharif and rabi, 2019-20 and 2020-21 at Agronomy Main Research Farm, newlineOUAT, Bhubaneswar. The soil of the experimental site was sandy loam in texture with pH 5.84, medium newlinein organic C (5.02 g/kg), low in available N (218.6 kg/ha), medium in available P (19.7 kg/ha) and K newline(182.6 kg/ha). The treatments comprised of three nutrient management practices, viz. N1: Soil Test Based newlineDose (STD:100-40-40 kg N-P2O5-K2O/ha), N2: STD+FYM at5t/ha and N3: STD+ in situ green newlinemanuring of dhaincha as horizontal factor and six weed management practices, viz. W1: pre-emergence newline(PE) application of bensulfuron-methyl (0.6%)+pretilachlor (6%) GR at0.66 kg/ha (tank mix), W2: W1+ newlinehand weeding (HW) at 35 DAT, W3: pyrazosulfuron-ethyl (10% WP) at 0.02 kg/ha (PE), W4: W3+ HW newlineat 35 DAT, W5: HW at 25 and 40 DAT and W6: weedy check as vertical factor were allotted to kharif newlinerice and replicated thrice in a strip plot design. The direct and residual effect of the treatments were newlinestudied on rice and mustard crop respectively. Pooled analysis revealed that incorporation of green newlinemanure along with STD (N3) recorded significantly 29.9 and 22.2 % lower weed density and newline37.6 and 35.4 % lower biomass than STD at 30 and 60 DAT of rice respectively whereas newlineamongst weed management treatments, W2 registered significantly 83.4 and 90.8% lower weed newlinedensity and 91.6 and 95.4% lower biomass than weedy check respectively. In mustard, newlinesignificantly 18.4 and 22.4% lower weed density and biomass were obtained with N3 treatment newlineas compared to N1 whereas the percentage of reduction in weed density and biomass under W2 newlineover weedy check (W6) were 48.3 and 49.1% respectively. The nutrient management practice newlinewith N3 was found to be significantly superior in terms of growth attributes and produced significantly newline17.7 and 11.1% higher rice grain yield (5562 kg/ha)