| Field investigation was carried out at Annamalai University, Experimental Farm, Annamalai Nagar to study the effect of post emergence herbicide 2,4-D Sodium salt on growth of rice during samba season (August- December, 2021) in a randomized block design with eight treatments and three replications. The treatments comprised of different weed management practices viz ., T1 - 2,4-D Sodium Salt (Formulation Dose 1000 g ha-1), T2 -
2,4-D Sodium Salt (Formulation Dose 1250 g ha-1), T3 - 2,4-D Sodium Salt (Formulation Dose 1500 g ha-1), T4 - 2,4-D Ethyl Ester 38% EC (Formulation Dose 2500 g ha-1), T5 - Metsulfuron methyl 10% + Chlorimuron ethyl 10% WP (Formulation Dose 20 g ha-1), T6 - Hand Weeding, T7 - Unweeded control and T8 - 2,4-D Sodium Salt (Formulation Dose 2500 g ha-1). Among the various herbicide treatments tested, post-emergence herbicide 2,4-D Sodium salt @ 1500 g ha-1 on 20 DAT (T3) favouring higher yield attributes viz., Number of panicles, Number of filled grains panicle, Test weight, Grain yield, Straw yield and Harvest index of rice and hand weeding twice on 20 and 40 DAT (T6) was next in order. The treatment T2 - 2,4-D Sodium Salt (Formulation Dose 1250 g ha-1), and T5 - Metsulfuron methyl 10% + Chlorimuron ethyl 10% WP (Formulation Dose 20 g ha-1), were on par with each other. Highest weed population, weed biomass, least yield attributes and grain yield of rice were recorded in control (T7). |
