Abstract

An experiment was conducted at Instructional-cum-Research Farm, Assam Agricultural University, Jorhat during rabi seasons of 2016–17 and 2017–18 with a view to find out the effect of integrated weed management (IWM) and integrated nutrient management (INM) on growth and yield of yellow sarson. The experiment was laid out in factorial randomized block design with three replications. The treatments consisted of five INM practices viz., control (N0), RDF (60-30-30 kg/ha N, P2O5, K2O (N1), 25% RDF+75% of N through vermicompost (N2), 50% RDF+50% of N through vermicompost (N3) and 75% RDF+25% of N through vermicompost (N4), and three IWM practices viz., weedy check (W0), pendimethalin 0.75 kg/ha pre-em+MW 20 DAS (W1) and pendimethalin 1.0 kg/ha pre-em+MW 20 DAS (W2). The data revealed that the density, dry weight and nutrient uptake of weeds during both the years were found to be significantly lesser with N4 compared to rest of the treatments. Moreover, the growth parameters (barring N3 which was at par with N4) and yield attributing characters were significantly improved due to N4. The highest seed and stover yields of yellow sarson were recorded with N4. The oil content, oil yield, N, P and K content and uptake also increased with N4. In respect of IWM, W2 was found to result in significantly lesser density and dry weight of weeds with lower NPK content and uptake in weeds. The growth and yield attributing characters of yellow sarson were improved with W2 which also recorded the highest seed and stover yields. With regard to oil content, oil yield, N, P and K content and uptake, the values were significantly higher with W2. The INM interacted significantly with IWM in respect of seed and stover yields of yellow sarson. The combination of N4W2 was found to be superior. The comparative economics highlighted that N4W2 combination resulted in the highest gross returns, net returns and benefit: cost ratio.