Journal of FARM SCIENCES, Vol 36, No 04 (2023)

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Integrated weed management in soybean [Glycine max (L.) Merrill]

Gajendra K R, Nooli S S, Nadagouda B T, Vidyavathi G Y

Abstract


Abstract: A field experiment was conducted to study the effect of integrated weed management on growth and yield of soybean at Agricultural Research Station, Hukkeri, Belagavi, during kharif, 2022. The experiment was laid out in RCBD with three replications. The experiment consisted of 10 treatments comprising of 8 pre-emergence herbicides (Sulfentrazone + Clomazone, Sulfentrazone + Metolachlor, Metolachlor, Metribuzin, Pendimethalin + Imazethapyr, Flumioxazin, Pendimethalin, Diclosulam) and they were tested along with one intercultivation operation. Among the herbicidal treatments, application of Sulfentrazone 28% + Clomazone 30% WP (350 + 375 g a.i ha-1) RM @ 1250 g ha-1 as PE followed by one inter cultivation at 35 DAS recorded significantly lower weed density (2.27 m-2), dry weight of weeds (2.42 g m- 2 ) and higher weed control efficiency (88%) for total weeds at 15 days after herbicide application (DAHA) with lower weed index (5.30%). It also recorded higher plant height (53.89 cm), number of branches (7.75 plant-1), total dry matter production (16.80 g plant-1), seed yield (2413 kg ha-1), gross returns (`115824 ha-1), net returns (`70887 ha-1) and benefit cost ratio (2.58). The lower seed yield, net returns and benefit cost ratio was recorded with Metribuzin 70% WP (0.35 kg a.i. ha-1) @ 500 g ha-1 as PE followed by one inter cultivation at 35 DAS due to phytotoxicity of Metribuzin on soybean. Seed quality was not influenced by herbicidal treatments

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