A field experiment on rice-mustard cropping system was carried out at Odisha University of Agriculture and Technology, Bhubaneswar, India during 2020 to assess the residual effects of different nutrient and weed management practices applied to previous kharif rice on weed dynamics and productivity of succeeding zero tilled rabi mustard. The treatments comprising three nutrient and six weed management practices were applied to rice under strip plot design with three replications and their residual effects on mustard were studied. The results revealed that the residual effect of integrated nutrient management of in situ green manuring (GM) of dhaincha along with soil test based dose (STD) suppressed the weed population effectively and increased mustard yield significantly. The residual effect of STD+GM reduced the weed density by 36.4 and 24.6 percent at 30 DAS, 37.1 and 26.4 percent at 60 DAS as compared to STD and STD+ FYM respectively. The weed biomass under STD+GM treatment (carry over effect) was 44.7 and 29.8 percent less at 30 DAS and 38.6 and 25.8 percent less at 60 DAS than STD and STD+ FYM respectively. Similarly among weed management practices, the residual effect of the treatment comprising pre emergence application of bensulfuron methyl+pretilachlor followed by (fb) HW on 35 DAT registered minimum weed density which was significantly 76.6 and 74.7 percent lower than weedy check at 30 and 60 DAS respectively and minimum weed biomass which was significantly 77.6 and 77.9 percent lower than weedy check at 30 and 60 DAS respectively. The integrated application of STD along with GM as nutrient management practice and pre emergence application of bensulfuron methyl+ pretilachlor fb HW on 35 DAT as weed management practice produced the maximum leaf area index, crop growth rate and seed yield while sole application of STD as nutrient management practice and weedy check recorded the minimum values. The integration of STD+GM (residual) enhanced the seed yield and stover yield of mustard by 11.9 and 5.5 percent as compared to sole STD (residual) respectively. Pre emergence application of bensulfuron-methyl+ pretilachlor fb HW on 35 DAT had positive carry over effect and registered the maximum seed yield of 1522 kg ha-1 which was 19.5 percent higher than the carry over effect of weedy check and was statistically at par with two hand weeding treatment

Soil test based dose, Green manure, FYM, Bensulfuron-methyl, Pretilachlor, Pyrazosulfuron ethyl, Mustard

From the experiment it can be concluded that the integrated application of green manure crop Sesbania or FYM along with soil test based chemical fertilizer and weed management of pre emergence application of bensulfuron methyl+ pretilachlor or bensulfuron methyl+ pretilachlor fb HW at 35 DAT or pyraozsulfuron ethyl fb HW at 35 DAT or manual weeding twice can be recommended to the rice crop in rice-mustard cropping system to get higher productivity of mustard

Nayak J.K., Satapathy M.R., Mohapatra B.K., Rath B.S. and Mishra A. (2023). Residual Effect of Integrated Nutrient and Weed Management on Weed Dynamics and Productivity of Mustard (Brassica juncea L.) under Rice-mustard Cropping System in Eastern India. Biological Forum – An International Journal, 15(8): 586-590