Effect of different Doses and Time of Applications of Topramezone on Weed Dynamics, Growth and Yield of Chickpea (Cicer arietinum L.) in Bihar (India)

Aims: To study the different levels of doses and time applications of topramezone on weed, growth and yield of chickpea (Cicer arietinum L.) in Bihar. Place and Duration of Study: Agronomy research farm of Tirhut College of Agriculture, Dholi, Muzaffarpur (Bihar), during the rabi 2020-21. Methodology: The experiment was carried out in an RBD design with three replications and ten treatments: topramezone (20.6 and 25.7 g/ha) applied at 14, 21, and 28 DAS, and quizalofop-p-ethyl (100 g/ha) applied at 25 DAS as post-emergence (PoE), pre-emergence (PE) application of valor 1000 g/ha + one hand weeding (HW) at 30 DAS, weed-free control (WFC), and weedy check. Results: PE application of valor 1000 g/ha + one HW 30 DAS recorded maximum plant height, number of branches/plants, plant dry matter, seed and straw yield while registered lowest weed dry weight and WCE as compared to all other herbicide treatments. Among all PoE-treated treatments, spray of topramezone (25.7 g/ha) after 21 days of sowing recorded maximum of all these growth parameters at harvest and lowest weed dry matter and highest WCE as compared to other PoE applications.