Bio-efficacy evaluation of different herbicides against broad leaved and grassy weeds in common wheat (Triticum aestivum L.)

摘要

Field experiment was carried out during 2008-10 at Research Farm, Division of Agronomy, Indian Agricultural Research Institute, New Delhi, to evaluate the bio-efficacy of different herbicides against weed flora in wheat (Triticum aestivum L.). Data reveals that dicot or broad- leaved weeds constituted the major proportion at all growth stages of crop followed by grassy weeds. Among monocot weeds, Avena ludoviciana (6.20 and 6.95 %) and Phalaris minor (2.20 % and 2.42 %) and among dicot weeds, Chenopodium album (65.50 and 64.59 %), Melilotus indica (10.09 and 10.63 %), Coronopus didymus (8.07 and 5.61 %) and Rumex dentatus (3.36 and 5.15 %) were predominant. With regards to the weed control, all the herbicides caused the significant reduction in thedensities of both broad-leaved and grasses during both the year of study. Among the herbicidal treatments, readymix applications of mesosulfuron+iodosulfuron (24.0 + 4.8 g ha1) caused the highest reduction in the density of broad leaved and grassy weedsduring both the years at all stages of crop growth, which however was statistically at par with mesosulfuron+iodosulfuron (18.0+3.6 g ha1), sulfosulfuron+ metsulfuron (20.0 + 4.0 g ha1) and clodinafop+metsulfuron (60.0 + 4.0 g ha1). Thus, study suggestedthat ready mix application of mesosulfuron+iodosulfuron (24.0 + 4.8 g ha1) is recommended for successful control of monocot and dicots in wheat.