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), Journal Name: J. Agric. Food Chem.; (United States) Vol. 36:2; ISSN JAFCA
• Country of Publication: United States
• Language: English

Related Subjects

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