Abstract
The increasing use of cover crops (CC) may lead to an increase in glyphosate application for their destruction. Sorption and degradation of 14C-glyphosate on and within 4 decaying CC-amended soils were compared to its fate in a bare soil. 14C-Glyphosate and its metabolites distribution between mineralized, water-soluble, NH4OH-soluble and non-extractable fractions was determined at 5 dates during a 20°C/84-d period. The presence of CC extends 14C-glyphosate degradation half-life from 7 to 28days depending on the CC. 14C-Glyphosate dissipation occurred mainly through mineralization in soils and through mineralization and bound residue formation in decaying CC. Differences in sorption and degradation levels were attributed to differences in composition and availability to microorganisms. CC- and soil-specific dissipation patterns were established with the help of explicit relationships between extractability and microbial activity.
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