title: Dissipation of the herbicide dithiopyr in soil and residues in wheat (Triticum aestivum L) grain under Indian tropical conditions.
abstract: Dissipation of dithiopyr in soil was monitored after application to wheat crop as pre- or post-emergence applications at two rates, viz 100 and 200 g AI ha(-1). The level of dithiopyr in the soil was assessed by gas chromatography, and its disappearence was found to follow a first-order decay curve irrespective of rate or method of application. The half-life in soil ranged between 17.3 and 25.0 days and residues at harvest (150 days after application) ranged between 4.0 and 8.8% of amounts applied. Investigation of microbial degradation of dithiopyr was conducted in minimal salt and Czapek Dox media in which 80% of the compound degraded within 15 days. Residues were not detected in wheat grain at harvest.
authors.affiliation: Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi, India.
authors.forename: Nirmali
authors.initials: N
authors.lastname: Saikia
authors.forename: Gita
authors.initials: G
authors.lastname: Kulshrestha
mesh_terms: D006207:Half-Life; D006540:Herbicides / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D007194:India; D015394:Molecular Structure; D011725:Pyridines / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D012987:Soil / Q000032:analysis*; D014908:Triticum / Q000378:metabolism*; D014329:Tropical Climate
chemical_list: D006540:Herbicides; D011725:Pyridines; D012987:Soil; C071869:dithiopyr