Impact of New Herbicides on Weed Population and Weed Control Efficiency in Scented and Hybrid Rice (Oryza sativa L.)

Field experiments were carried out to study the effect of herbicide and micronutrient spray on different verities of rice (Oryza sativa L.) at Students’ Instructional farm, Chandra Shekhar Azad University of Agriculture and Technology, Kanpur (U.P.), during Kharif season 2022 and 2023. The experiment was laid out in split-split plot design with three replications and 24 treatment combinations comprising of two varieties viz. Arize 6444 Gold (V1) and PB 1509 (V2) were kept in main plots and three herbicidal treatments viz. Control (W1), Bispyribac-sodium10% SC@ 20 g a.i. ha-1 at 25 DAT (W2), Triafamone 20% + Ethoxysulfuron 10 WG @ 225g ha-1 at 25 DAT (W3) were kept in Sub plots and four micronutrients application viz, Zinc Sulphate 0.5% + Ferrous Sulphate 1% foliar spray at 45 and 60 DAT (M1), Zinc Sulphate 0.5% + Ferrous Sulphate 1% + Manganese Sulphate 0.1% foliar spray at 45 and 60 DAT (M2), Zinc Sulphate 0.5% + Ferrous Sulphate 1% + Manganese Sulphate 0.1% + Borax 0.2% foliar spray at 45 and 60 DAT (M3), Zinc Sulphate 0.5% + Ferrous Sulphate 1% + Manganese Sulphate 0.1% + Borax 0.2% + Silicon 0.1% foliar spray at 45 and 60 DAT (M4) were kept in Sub-sub plots. Result revealed that Arize 6444 Gold variety had better weed suppression compare to PB 1509. On other side, herbicidal application with Triafamone 20% + Ethoxysulfuron 10 WG @ 225g ha-1 spray at 25 DAT, provided the most effective control against weed flora, weed fresh weight, dry weight and weed control efficiency, among all the growth stages. However, foliar spray of Zinc Sulphate 0.5% + Ferrous Sulphate 1% + Manganese Sulphate 0.1% + Borax 0.2% + Silicon 0.1% foliar spray at 45 and 60 DAT had a notable impact on reducing dry weed weight and significant influenced on weed control efficiency.