Weed Management and Residues following Sequential Application of Herbicides in Onion (Allium cepa L.)

The weed control efficacy of fluchloralin, pendimethalin and oxyfluorfen in sequential application to onion crop is reported. Two sequential applications of each herbicide at 30 days interval were better than single application. When applied sequentially, pendimethalin gave the best weed control and was at par with three hand weedings. Residue analysis in green leafy and ripe onion bulbs by gas liquid chromatography revealed that the residues of herbicides were below the maximum residue limits (MRLs) at recommended as well as with 2 sequential applications.