Efficacy of herbicides on broad-leaved weed and yield of wheat (Triticum aestivum L.)

Abstract

A study was undertaken during Rabi 2016-17 at Instructional Farm of Rajasthan College of Agriculture, Udaipur to assess the Evaluation of Herbicides for Control of Broad-leaved Weeds in Wheat to identify the effective herbicides for controlling broad-leaved weed flora in wheat. The experiment consisted of eleven treatments viz. halauxifen methyl ester + florasulam + polyglycolat 12.76 g ha-1 (T1); metsulfuron + surfactant at 4 g ha-1 (T2); carfentrazoneat 20 g ha-1 (T3); 2, 4-D Na Saltat 500 g ha-1 (T4); 2, 4-D Esterat 500 g ha-1 (T5); metsulfuron + carfentrazone + surfactantat 4 g + 20 g ha-1 (T6); 2, 4-D Na + carfentrazoneat 400 g + 20 g ha-1 (T7); 2, 4-D E + carfentrazone at 400 g+ 20 g ha-1 (T8); halauxifen + florasulam + carfentrazone + surfactantat 10.21 g + 20 g ha-1 (T9); weedy check (T10); weedy free (T11). All the herbicides were applied as post-emergence at 32 days after sowing. Among the herbicidal treatments, application of Halauxifen+ Florasulam+ Carfentrazone + surfactant recorded significantly lesser total broad leaf weed dry matter (2.73 g 0.5 m-2), maximum broad leaf weed control efficiency (90.42 %) at 30 days. Application of Halauxifen+ Florasulam+ Polyglycol recorded minimum weed dry matter (4.67 and 6.33 g 0.5 m-2 during 60 days and at harvest after spraying of post-emergence herbicides, respectively), highest weed control efficiency (90.42 and 86.20% during 60 days and at harvest after spraying of post-emergence herbicides, respectively) and Minimum weed index (2.44 %). The highest grain yield (5151 kg ha-1), biological yield (12415 kg ha-1), straw yield recorded by application of halauxifen + florasulam +polyglycol followed by halauxifen + florasulam + carfentrazone + surfactant.