ADSORPTION OF GLYPHOSATE AND AMPA IN AGRICULTURAL SOILS ABSORPTION DE GLYPHOSATE ET L'AMPA DANS LES SOLS AGRICOLES ASSORBIMENTO DI GLIFOSATE ED AMPA

Immediately after application glyphosate is mostly adsorbed in the upper 2 cm of soils, and is then transported and adsorbed after few days in deeper soil horizons with concomitant increasing content of its metabolite aminomethylphosphonic acid (AMPA). This work confirmed previous studies, where Fe-oxides seem to play a major role in the adsorption of glyphosate and AMPA in soils: the Chernozem featured lower contents of Fed and Feo, with consequently lower adsorption of glyphosate and AMPA as compared with the higher weathered Cambisol and Stagnosol.