Effect of post-emergence herbicides in pigeonpea (Cajanus cajan L.) + Soybean (Glycine max L.) Intercropping system

A field experiment was conducted during Kharif 2024 at ZARS, Kalaburagi, to evaluate the efficacy of post-emergence herbicides in a pigeonpea + soybean intercropping system. The experiment was laid out in a randomized complete block design (RCBD) with ten treatments, replicated thrice. The results revealed that application of Pendimethalin 38.7% CS @ 678 g a.i. ha^-1 as a pre-emergence fb Imazethapyr 35% + Imazamox 35% WG @ 75 g a.i. ha^-1 at 20-25 DAS as a post-emergence recorded the significantly higher growth parameters of both pigeonpea and soybean, including plant height, leaf area index, dry matter production, and its accumulation in plant parts. Yield parameters viz., seed yield and haulm yield of pigeonpea and soybean also resulted in higher B:C. However, it was statistically on par with pendimethalin with treatment 38.7% CS @ 678 g a.i. ha^-1 (PE) fb Propaquizofop 2.5% + Imazethapyr 3.75% ME @ 125 g a.i. ha^-1 (20-25 DAS, POE), Pendimethalin 38.7% CS @ 678 g a.i. ha^-1 (PE) fb Quizalofop ethyl 7.5% + Imazethapyr 15% EC @ 32.81 + 65.62 g a.i. ha^-1 at 20-25 DAS (POE) and Hand weeding at 15 DAS fb IC at 30 DAS.