Decay characteristics and erosion-related transport of glyphosate in Chinese loess soil under field conditions

Abstract

The decay characteristics and erosion-related transport of glyphosate and aminomethylphosphonic acid (AMPA) were monitored for 35. d at different slope gradients and rates of application in plots with loess soil on the Loess Plateau, China. The initial glyphosate decayed rapidly (half-life of 3.5. d) in the upper 2. cm of soil following a first-order rate of decay. AMPA content in the 0-2. cm soil layer correspondingly peaked 3. d after glyphosate application and then gradually decreased. The residues of glyphosate and AMPA decreased significantly with soil depth (p