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ThesisItem Open Access NUTRIENT AND WEED MANAGEMENT IN RAINFED TORIA BY ORGANIC METHODS(AAU, Jorhat, 2020-07) Borah, Prostuti; Choudhary, J.K.An experiment entitled “Nutrient and weed management in rainfed toria by organic methods” was conducted at Instructional-cum-Research Farm, Assam Agricultural University, Jorhat during the rabi season of 2019-2020 to study the effect of nutrient management (NM) and weed management (WM) by organic methods on growth and yield of toria. The experiment was laid out in randomized block design (factorial) with three replications. The treatments consisted of three nutrient management treatments viz., control (N0), application of vermicompost 2.5 t/ha (N1) and application of vermicompost 5.0 t/ha (N2) and three weed management treatments viz., control (W0), hand weeding at 30 DAS (W1) and dryland weeder operation at 30 DAS (W2). The soil of the experimental site was sandy loam in texture, acidic in reaction (pH: 5.1), medium in organic carbon (0.58%), available N (270.86 kg/ha), P2O5 (21.87 kg/ha) and K2O (169.82 kg/ha). The weeds of the experimental fields were Cynodon dactylon, Eleusine indica, Paspalum conjugatum, Panicum repens, Axonopus compressus among grasses ; Cyperus rotundus the sedge and Commelina benghalensis, Ageratum houstonianum, Mimosa pudica, Acmella euliginesa, Gynura bicolor, Oxalis corniculata, Alternanthera philoxeroides and Chenopodium album among the broad leaved weeds. The density and dry weight of weeds in rainfed toria were found to be significantly lesser with application of 5.0 t/ha vermicompost compared with other treatments. As a result, the content and uptake of N, P and K by weeds were found to be significantly lesser with N2. The growth parameters like plant height, number of primary branches/plant, number of secondary branches/plant and yield attributing characters viz., number of siliquae/plant, number of seeds/siliqua were found to be significantly improved in N2. The highest seed yield (929.26 kg/ha), stover yield (1997.95 kg/ha) was recorded with this treatment. The oil content, oil yield, N, P and K content and uptake also increased with N2. In respect of weed management, dryland weeder operation at 30 DAS (W2) was found to significantly lower the density and dry weight. N, P and K content and uptake of weeds in rainfed toria. The growth and yield attributing characters of rainfed toria improved significantly with this treatment which recorded the highest seed (755.67 kg/ha) and stover (1750.18 kg/ha) yields. Oil content, oil yield, N, P and K content and uptake also increased with W2. NM interacted significantly with WM in respect of seed and stover yields of toria. The combination of N2W2 was found to be superior with 1038.28 kg/ha and 2217.17 kg/ha seed and stover yield. The treatment combination N2W2 resulted in higher gross return (Rs. 67,082.69 /ha), net return (Rs. 43,379.69 /ha) and the benefit: cost ratio (1.83).
