Glyphosate applied on soil is a favorable substrate for soil microorganisms (Neumann et al. 2006) due to its low C:N (3:1) ratio (Haney et al. 2000). Glyphosate also contains phosphorous, which may assist in its enhanced degradation, since phosphorus is an essential nutrient for microorganisms (Kertesz et al. 1994). The degradation kinetics of glyphosate in soil indicates that glyphosate does not support microbial growth; instead, the herbicide is co-metabolized by the indigenous soil microorganisms (Sprankle et al., 1975a and Forlani et al., 1999).