Effect of Sequential Application of Herbicides on Weed Management, Productivity and Nutrient Uptake of Direct Seeded Rice

The investigation was carried out at BiharAgricultural University, Sabour, Bhagalpur (Bihar) during kharif, 2018 to find the impact of chemical weed management on complex weed flora and productivity of direct seeded rice. The dominant weeds in field were Cyperus rotundus, Echinochloa spp, Eleusine indica and Caesulia axillaries. The lowest weed population, dry weight, highest percent weed control efficiency and productivity of rice were recorded by the hand weeding treatment.Among all the herbicidal treatments, the lowest weeds count, weeds dry weight and highest percent weed control efficiency, high productivity and nutrient uptake of rice were recorded under treatment pyrazosulfuron @ 25 g a.i. ha⁻¹ PE fb pyrazosulfuron @ 20 g a.i. ha⁻¹ + bispyribac-Na @ 20 g a.i. ha⁻¹ at POE which can be recommended to the farmers.