Impact of Pre and Post-Emergence Herbicides on Growth and Yield Performance of Urdbean (Vigna mungo L.)

The experiment was conducted at the Agronomy Research Farm of N.D. University of Agriculture and Technology, Kumarganj, Ayodhya (U.P.) during the Kharif season of 2015-16, to evaluate the effects of pre-emergence and post-emergence herbicides on the growth and yield of Urdbean (Vigna mungo L.). Twelve weed management treatments were tested, including: Imazethapyr 70 g ha⁻¹ PRE, Imazethapyr 80 g ha⁻¹ PRE, Imazethapyr 70 g ha⁻¹ POE (3-4 leaf stage of weeds), Imazethapyr 80 g ha⁻¹ POE (3-4 leaf stage of weeds), Imazethapyr + imazamox (RM) 70 g ha⁻¹ PRE, Imazethapyr + imazamox (RM) 80 g ha⁻¹ PRE, Imazethapyr + imazamox (RM) 70 g ha⁻¹ POE (3-4 leaf stage of weeds), Imazethapyr + imazamox (RM) 80 g ha⁻¹ POE (3-4 leaf stage of weeds), Pendimethalin 1000 g ha⁻¹ PRE, Imazethapyr + Pendimethalin (RM) 1000 g ha⁻¹ PRE, Hoeing (20 & 40 DAS) and a Weedy check. The results showed that the pre-emergence application of imazethapyr + pendimethalin at 1000 g ha⁻¹ was the most effective treatment, improving the growth parameters and grain yield of urdbean. This was followed by imazethapyr + imazamox (RM) at 80 g ha⁻¹, imazethapyr + imazamox (RM) at 70 g ha⁻¹, and pendimethalin at 1000 g ha⁻¹. The post-emergence application of imazethapyr + imazamox (RM) at 80 g ha⁻¹ produced significantly higher grain yield compared to the other treatments.