High Performance Liquid Chromatographic Method for Estimation of Oxadiargyl Residues in Paddy Grains, Straw and Soil

摘要

A field experiment was conducted at CCSHAU Regional Research Station, Karnal during kharif 2005 to evaluate the effectivity of a pre-emergence herbicide, oxadiargyl (Top Star) applied @ 100 and 200 g a. i./ ha to keep the field weed-free for the wholeseason. The soil of the experimental field was clay loam in texture and slightly alkaline with pH 8.2. Residues were estimated in paddy grains, straw and soil at harvest by HPLC. The per cent recoveries at the fortification levels of 0.25, 0.50 and 1.0(mu g g~(-1) in soil, paddy grains and straw were found in the range of 85-90, 81-85 and 83-86, respectively, with the detection limit of 0.05mu g g~(-1). No detectable residues were found in grain, straw and soil samples at harvest.