Effect of pre-emergence herbicides on weed dynamics and productivity of soybean [Glycine max (L.) Merill]

Experiment on “Effect of pre-emergence herbicides on weed dynamics and productivity of soybean [Glycine max (L.) Merrill]” was conducted during kharif, 2023 at Instructional cum research farm, Indira Gandhi Krishi Vishwavidyalaya, Raipur, Chhattisgarh. Soil of experimental field was clayey (vertisols), neutral (pH 7.40), contained 0.45% soil organic carbon, and had low nitrogen (216 kg ha-1), low phosphorus (13.02) and high potassium (373 kg ha-1). Experiment was laid out in Randomized block design with 3 replication and 8 treatments.The yield attributes viz, number of pod plant-1, pod length, seed index, seed yield, stover yield and harvest index were found maximum under hand weeding twice (20 and 40 DAS) followed by PoE of imezathapyr (10%SL) @ 75 a.i. g ha-1. Minimum values of above characters were recorded in weedy check. Experimental field was dominated with Bracharia eruciformis, Cynodon dactylon, Echinochloa colona and Merremia emarginata. In hand weeding twice (20 and 40 DAS) minimum total weed density and weed dry weight was recorded, it was followed byPoE of imezathapyr (10%SL) @ 75 a.i. g ha-1. Highest Weed control efficiency was found in hand weeding twice (20 and 40 DAS) followed by PoE of imezathapyr (10%SL) @ 75 a.i. g ha-1and lowest in weedy check.