STUDY ON THE INTEGRATED WEED MANAGEMENT IN JUTE

Abstract

The experiment was conducted at the Agronomy research field, Sher-e-Bangla Agricultural University, Dhaka during April 2019 to August 2019 to find out suitable environment friendly and remunerative integrated weed management for jute (Corchorus capsularis L.) var. BJRI Deshi pat-8 (BJC-2197). The growth pattern of infesting major weeds concerning jute grown for fibre in jute fields was also observed. In the experiment, the treatments consisted of twelve weed managements, viz., weedy check, one hand weeding, two hand weeding, rice straw mulch, jute intercropped with mungbean (Vigna mungo L) var. BARI Mung-6, pre-emergence herbicide (Pendimethalin @ 600 g ha at 2 DAS), post-emergence herbicide (Quizalofop-ethyl @ 50 g ha at 20 DAS), pre + post-emergence herbicide, pre-emergence herbicide + one hand weeding, mungbean + pre-emergence herbicide, mungbean + post-emergence herbicide, and mungbean + pre + post-emergence herbicide. The experiment was laid out in a randomized complete block design (RCBD) with three replications. The predominant weeds observed were annual grasses and sedges including nutsedge. Broadleaved weeds occurred in a smaller number and were not a serious problem. Among the weed species maximum relative weed density was observed for Cynodon dactylon (42%) at 30 DAS which was followed by Echinochloa colona (32%) and Eleusine indica (20%). Results revealed that integrated weed management in jute had a significant influence on the growth and yield components of jute. The highest fibre yield (4.09 t ha ii

-1 ) was obtained from the application of pre-emergence herbicide and one hand weeding and the lowest fibre yield (2.80 t ha -1 ) was observed from the application of postemergence

herbicide associate with mungbean. All parameters were also significantly influenced by weed management and intercropping with jute at all growth stages of the mungbean. The highest grain yield (1.35 t ha ) was recorded in the combination of post-emergence herbicide and the lowest grain yield (1.05 t ha -1 ) was achieved by the weed management with jute. Gross return from the different treatment combinations ranged between 92,795 to 2,95,600 Tk. ha -1 . The combination of mungbean with post-emergence herbicide gave the highest return (2,95,600 Tk. ha -1 ) while the lowest net return (92,795 Tk. ha -1 ) was obtained from the treatment weedy check. The highest (3.04) benefit-cost ratio (BCR) was found from the integrated weed management of jute intercropped with mungbean and the application of postemergence

herbicide. Therefore, this experiment showed that higher profitability in jute cultivation can be achieved by the adoption of integrated weed management practices like intercropping with mungbean along with recommended herbicide application.