from controls (Figure 2). However, only the 53 rate was significantly different from the other glyphosate treatments at this time. The third day after application, all glyphosate rates were significantly different from each other, and all additions were significantly different from the control. By 14 d after glyphosate addition, however, the rate of C mineralization had essentially returned to background levels for all glyphosate treatments, and rate differences were no longer observed (Figure 2). The C flush 2 d after application suggested that glyphosate was either readily and directly utilized by soil microbes or made other resources available(Forlani et al. 1999).