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Factors Influencing Microbial Degradation of 14C-Glyphosate to 14CO2 in Soil

Published online by Cambridge University Press:  12 June 2017

Loren J. Moshier  and
Donald Penner
Loren J. Moshier
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824
Donald Penner
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824
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Abstract

14C-glyphosate [N-(phosphonomethyl)glycine] degradation to 14CO2 was examined in a Spinks sandy loam, Collamer silt loam, and a Norfolk loamy sand. After 32 days, 40, 9.5, and 3% of the 14C-glyphosate was recovered as 14CO2 in the three soils, respectively. The degradation was primarily microbial. Phosphate additions stimulated 14C-glyphosate degradation to a limited extent in the Collamer silt loam but not in the Norfolk loamy sand. Additions of Fe+++ and Al+++ ions reduced degradation in the Spinks sandy loam. It is postulated that formation of colloidal Fe and Al precipitates in modified soils with concomitant adsorption of 14C-glyphosate is responsible for decreased availability of 14C-glyphosate to microorganisms. Mn++ additions were found to increase degradation. Spinks soil and carbon substrate amendments failed to substantially increase degradation rates in both soils with low degradation rates.

Keywords

Phosphateferric chloridepHglucose
Type
Research Article
Information
Weed Science , Volume 26 , Issue 6 , November 1978 , pp. 686 - 691
Copyright
Copyright © 1978 by the Weed Science Society of America 

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References

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