Weed management in kharif rice in new alluvial zone of West Bengal

Abstract

A field experiment was carried out during the Kharif season of two consecutive years 2015 and 2016 at Instructional Farm, Jaguli, Bidhan Chandra Krishi Viswavidyalaya, Nadia, West Bengal with the focal objective to assess the effect of different weed control measures on yield of transplanted kharif rice, IET 4786. Experiment having 3 replications was conducted in Randomized Block Design with nine treatments, namely, T 1 -Pendimethalin 30% EC + Pyrazosulfuron ethyl 10 % WP @ 675 + 15 g a.i, T 2 -Pendimethalin 30% EC + Pyrazosulfuron ethyl 10 % WP @ 900 + 200 g a.i, T 3 -Pendimethalin 30% EC + Pyrazosulfuron ethyl 10 % WP @ 1125 + 25 g a.i, T 4 -Pendimethalin 30% EC @ 1500 g a.i, T 5 -Pyrazosulfuron ethyl 10 % WP @ 15 g a.i, T 6 -Pyrazosulfuron ethyl 10 % WP @ 20 g a.i, T 7 -Metsulfuron methyl 10 % + Chlorimuron ethyl 10 % WP @ 4 g a.i, T 8 -Hand weeding and T 9 -Weedy check. Significant variations were observed on the mixed weed flora as well as onperformance of rice under the different herbicidal treatments.Pendimethalin 30% EC + Pyrazosulfuron ethyl 10% WP @ 1125+25 g a.i) was found to be the most effective recording the lowest weed population and weed dry weightwith the highest weed control efficiency (83.5% in 2015 and 79.8 % in 2016)