title: Effect of fly ash on persistence, mobility and bio-efficacy of metribuzin and metsulfuron-methyl in crop fields.
abstract: Field evaluation of two fly ashes (40t/ha) on persistence, mobility and bioactivity of metribuzin and metsulfuron-methyl was studied in soybean and wheat crops, respectively. Metribuzin was applied as pre-emergence at 0.5kg/ha, while metsulfuron-methyl was applied post-emergence at 8g/ha. Results suggested that metribuzin in surface (0-15cm) soil of fly ash unamended plots reached below detectable limit in 60 days, while herbicide persisted till 112 days in surface soil of fly ash amended plots. No metribuzin leached down to subsurface (15-30cm) soil in fly ash amended plots, while traces of metribuzin (0.6-1.2μg/kg) were recovered in subsurface soil of fly ash unamended plot. Metsulfuron-methyl in surface soil persisted till 15 days in control and 20 days in fly ash amended plots and no metsulfuron-methyl leached down to subsurface soil. Fly ash amendment had no adverse effect on the bioactivity of herbicides and yield of soybean and wheat. The study suggested that fly ash amendment to soil can be exploited to retain applied herbicides in surface soil.
authors: Division of Agricultural Chemicals; Indian Agricultural Research Institute, New Delhi 110012, India. Electronic address: drneerasingh@yahoo.com.
authors: Neera
authors: N
authors: Singh
authors: Shashi
authors: S
authors: Bala Singh
authors: Raunaq
authors: T K
authors: TK
authors: Das
mesh_terms: D001190:Arylsulfonates / Q000032:analysis / Q000737:chemistry* / Q000633:toxicity*; D060729:Coal Ash / Q000737:chemistry / Q000494:pharmacology*; D006540:Herbicides / Q000032:analysis / Q000737:chemistry / Q000633:toxicity; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry / Q000633:toxicity; D013025:Glycine max / Q000187:drug effects; D013997:Time Factors; D014227:Triazines / Q000032:analysis / Q000737:chemistry* / Q000633:toxicity*; D014908:Triticum / Q000187:drug effects
chemical_list: D001190:Arylsulfonates; D060729:Coal Ash; D006540:Herbicides; D012987:Soil; D012989:Soil Pollutants; D014227:Triazines; C050296:metsulfuron methyl; C009235:metribuzin
keywords: Bioactivity; Fly ash; Metribuzin; Metsulfuron-methyl; Mobility; Persistence