Effect of sulphur nutrition and weed management on productivity and quality of Soybean [Glycine max (L.) Merrill] under tarai condition
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Date
2020-11
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
A field experiment was conducted during kharif season of 2019 at N.E.B.C.R.C. of G.B. Pant University of Agriculture and Technology, Pantnagar (Uttarakhand). To study the effect of sulphur nutrition and weed management practices on yield, quality and economics of various treatment consequently applied. The soil on the experimental site was silty clay loam, neutral in pH 7.1 with high organic carbon (1.18%), medium in available nitrogen (232.7 kg ha-1), phosphorus (25.8 kg ha-1) and potassium (135.7 kg ha-1). Soybean variety “PS-1347” was sown on 4th July, 2019 and harvested on 16th November, 2019. The experiment was laid out in a factorial randomized block design with three replications and two factors viz. Sulphur application with two levels (0 & 40 kg S ha-1) and weed management practices with five levels (Pendimethalin at 1.0 kg ha-1 (PE), Imazethapyr at100g ha-1 (PoE), Pendimethalin at 1.0 kg ha-1 (PE) fb Imazethapyr at 100g ha-1 (PoE), twice hand weeding at 20 & 40 DAS and weedy check). Crop growth characters such as plant height and dry matter accumulation, number of trifoliate leaves, number of branches was recorded to be significantly affected by both the factors. The interaction effects were found significant in all the growth parameters except plant height. The major weeds infesting the experimental field were Cynodon dactylon, Echinochloa spp. among grasses, Alternanthera sessilis, Celosia argentea among broad-leaf weeds and Cyperus rotundus among sedges. Application of sulphur in the experimental field didn’t influence the weed density. However, weed dry matter accumulation was significantly affected by sulphur application. Pendimethalin at 1.0 kg ha 1 (PE) fb Imazethapyr at 100 g ha-1 (PoE) was the most effective treatment in reducing weed density and twice hand weeding at 20 and 40 DAS was found most effective in reducing weed dry matter accumulation as compared to other treatments. The interaction effects between sulphur nutrition and weed management practices were found non-significant with regard to weed dry matter and density. 40 kg S ha-1 among sulphur levels and twice hand weeding among weed management treatments resulted in highest N, P, K content and uptake in the seed as well as in stover. Protein and oil content and yield were also in the same line. Application of sulphur significantly influenced the yield and yield attributing characters, the highest seed yield (1719 kg ha-1), net return (`36,176) and B:C ratio (2.28) was obtained with sulphur 40 kg ha-1.While, the highest seed yield (1991kg ha-1), among weed management treatments was recorded in the twice hand weeded plots with net return (`44031) and B:C (2.46). Interaction effects on the seed yield, net return and B: C ratio were found significant. Twice hand weeding at 20 & 40 DAS with 40 kg S ha-1 was found best amongst treatments with regard to crop growth, efficiency of weed control, biochemical parameters and economic returns. However, Pendimethalin at 1.0 kg ha-1 (PE) fb Imazethapyr at 100 g ha-1 (PoE) can be resorted as herbicidal treatments in case of the unavailability of the man power.