AI Article Synopsis
- The study investigated how C-glyphosate behaves in different soil types (Catlin, Flanagan, and Drummer) under both oxygen-rich and oxygen-poor conditions.
- Soil aeration generally did not affect how well C-glyphosate was absorbed, but desorption of the herbicide increased in low-oxygen conditions across all soil types.
- Phosphate addition reduced C-glyphosate absorption and enhanced its degradation only in anoxic (low oxygen) soils, highlighting the role of soil conditions on glyphosate's availability and movement.
Article Abstract
The adsorption, desorption, degradation, and mineralization of C-glyphosate [-(phosphonomethyl)glycine] were examined in Catlin (a fine-silty, mixed, superactive, mesic Oxyaquic Argiudoll), Flanagan (a fine, smectitic, mesic Aquic Argiudoll), and Drummer (a fine-silty, mixed, superactive, mesic Typic Endoaquoll) soils under oxic and anoxic soil conditions. With the exception of the Drummer soil, soil aeration did not significantly alter the adsorption pattern of C-glyphosate to soils. Herbicide desorption was generally enhanced with anaerobiosis in all the soil types. Anoxic soils demonstrated slower microbial degradation and mineralization kinetics of C-glyphosate than oxic soils in all the soil types studied. Phosphate additions significantly reduced the adsorption of C-glyphosate to soils irrespective of soil aeration and confirmed the well-established competitive adsorption theory. The addition of soil phosphate stimulated degradation only in anoxic soils. The results from this research highlight the importance of soil redox conditions as an important factor affecting the bioavailability and mobility of glyphosate in soils.
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| http://dx.doi.org/10.2134/jeq2014.08.0331 | DOI Listing |
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