13C Glyphosate Effects On Roundup Ready (RR) Corn and RR Soybean Rhizosphere Microorganisms.

Our research is intending to close the gap between glyphosate use and effects on soil microbial communities by using labeled glyphosate. Two glyphosate formulations (Powermax/Monsanto and Cornerstone/Agrisolutions) are spiked with ¹³C glyphosate. A greenhouse experiment was set up in January 2010 where corn and soybean are grown in rhizoboxes and glyphosate is applied multiple times a year. Soil samples are being collected in the rhizophere and analyzed by extracting phospholipid fatty acids (PLFAs) and performing Fusarium-specific PCR. Data analysis is in progress. ¹³C PLFA data and Fusarium diversity will be presented and discussed.