Effect of Different Post Emergence Herbicides on Productivity and Weed Dynamics of Rice (Oryza sativa L.) under Transplanted Condition

Abstract

An experiment was conducted during the Kharif 2022 at Indira Gandhi Krishi Vishwavidyalaya, Raipur, Chhattisgarh to assess the effect of herbicides on growth and yield of transplanted rice. The experiment was laid out in randomized block design with three replication and nine distinct treatments. Among all the treatments, highest values of yield attributing characters viz., effective tillers m-2, number of grains panicle-1, number of filled grains panicle-1, panicle length, panicle weight and grain yield (57.44 q ha-1) were found under hand weeding at 20 and 40 DAT closely followed by penoxsulam 1.02% + cyhalofop butyl 5.1% OD (RM) @ 135 g a.i. ha-1 among the chemical weed control. Lowest values of above characters were obtained under unweeded control. The experimental field was dominated with Echinochloa colona, Alternanthera sessilis, Cyperus iria, Cyperus difformis, Cynodon dactylon and Eclipta prostrata throughout the crop growth period. Minimum total weed density (0.88 - 3.53 m-2) and total weed dry weight (0.94 - 4.66 g m-2) were registered under hand weeding at 20 and 40 DAT followed by application of penoxsulam 1.02% + cyhalofop butyl 5.1% OD (RM) @ 135 g a.i. ha-1 at different time intervals. Weed control efficiency was found highest in hand weeding at 20 and 40 DAT and lowest in unweeded control.