Bentazon degradation in soil: Influence of tillage and history of bentazon application

Document Type

Article

Publication Date

1-1-1996

Abstract

Laboratory studies determined the fate of bentazon (3-isopropyl-1H-2,1,3-benzothiadiazin-4(3.H)-one 2,2-dioxide) in soil as affected by tillage and history of application. Bentazon degradation in two soils from Mississippi and three soils from Illinois under conventional-tillage (CT) and no-tillage (NT) (3-18 years) with varying histories of bentazon application (0-9 applications) was studied. The half-life (DT50) for bentazon degradation ranged from 4.6 to 49.5 d; half-lives for NT of the two soils with the longest history of bentazon application were lower than those for CT. Half-lives for soils with no bentazon history were 3-11-fold higher than bentazon half-lives of those previously exposed to bentazon. Dissipation of bentazon was accompanied with increases in nonextractable material. Methylbentazon was the most consistently observed metabolite (1.7 - 5.8% applied 14C after 48 d). Bentazon mineralization ranged from 12% to 18% applied after 48 d and 2% to 3% applied after 22 d for bentazon history and nonhistory soils, respectively. Patterns of mineralization were affected by tillage in the two of the five soils with the longest bentazon history.

Publication Source (Journal or Book title)

Journal of Agricultural and Food Chemistry

First Page

1593

Last Page

1598

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