Vol. 11, Special Issue 7 (2022)

Author(s):
Vivek Kumar Dubey, VK Choudhary, MP Sahu, Kalicharan Ahirwar, Akhilesh Patel and PS Rathiya

Abstract:
Rice is an important cereal that feeds billions of people globally. Weeds are a major biological constraint that poses 30-100% yield loss in rice. Therefore, a field experiment was conducted at ICAR-Directorate of Weed Research, Jabalpur to evaluate the bio-efficacy of imazethapyr (ALS inhibiting herbicide) against major weeds in herbicide-tolerant rice during Kharif season of 2021. The results revealed that the sequential application of imazethapyr at 200 g/ha as early post-emergence (at 14 DAS) followed by (fb) imazethapyr 200 g/ha as late post-emergence (at 28 DAS) provided broad-spectrum weed control with the lowest density and dry weight of all major weeds. Sequential application of imazethapyr at 100 and 125 g/ha at 14 and 28 DAS and hand weeding (20 and 40 DAS) also provided better weed control and was comparable to sequential application of imazethapyr at 200 g/ha. The highest grain and straw yield was recorded under sequential application of imazethapyr 100 g/ha, which was followed by sequential application of imazethapyr 125 g/ha. Weedy check witnessed the highest density and dry weight of weed and harvested with the lowest grain yield. Based on the findings, sequential application of imazethapyr 100 g/ha at 14 and 28 DAS was the best weed management practice which provided higher weed control, grain and straw yield over other weeds management practices.