Persistence and transformation of the herbicide (/sup 14/C)glufosinate-ammonium in prairie soils under laboratory conditions

Journal Article · · J. Agric. Food Chem.; (United States)

OSTI ID:6995164

Smith, A E

The degradation of the herbicide (/sup 14/C)glufosinate-ammonium (the ammonium salt of DL-homoalanin-4-ylmethylphosphinic acid), at a rate of 2 ppm, was studied in three prairie soils at 85% of their field capacity moisture at both 20 and 10/sup 0/C. In all soils the herbicide was biologically transformed to degradation product(s) that underwent further slow degradation with release of (/sup 14/C)carbon dioxide. At 20/sup 0/C, the soil half-life values for the (/sup 14/C)herbicide were 3-7 days and, at 10/sup 0/C, 8-11 days. Over a 90-day incubation period at 20/sup 0/C, between 28 and 55% of the applied radioactivity was released from treated soils as (/sup 14/C)carbon dioxide; solvent-extractable degradation product(s) accounted for 19-37% of the applied radioactivity; between 2.4 and 9.5% of the initial /sup 14/C was incorporated into soil microbial biomass and 7-13% into the fulvic, humic, and humin soil fractions.

• Research Organization: Agriculture Canada, Regina, Saskatchewan
• OSTI ID: 6995164
• Journal Information: J. Agric. Food Chem.; (United States), Vol. 36:2
• Country of Publication: United States
• Language: English

Related Subjects

60 APPLIED LIFE SCIENCES
HERBICIDES
BIODEGRADATION
CARBON 14 COMPOUNDS
CARBON DIOXIDE
METABOLISM
SOILS
TRACER TECHNIQUES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PESTICIDES
553002* - Agriculture & Food Technology- Horticulture- (1987-)