Response of broadleaf and grass cover crop species to soil residues of glyphosate and aminomethylphosphonic acid (AMPA)

Abstract Glyphosate is the most widely used herbicide in United States; however, concern escalating about increasing residues of glyphosate and its metabolite aminomethylphosphonic acid (AMPA) soil. There a lack scientific literature examining response cover crops to soil or AMPA. The objectives this study were evaluate impact AMPA silty clay loam on emergence, growth, biomass crops, including cereal rye, crimson clover, field pea, hairy vetch, winter wheat, as well their germination 0.07% (0.7 g L –1 ) solution glyphosate. Greenhouse studies conducted at University Nebraska–Lincoln determine dose broadleaf grass soil-applied results indicated that treated with up 105 mg ae kg had no effect above-ground biomass, root any crop species tested. To seed species, seeds soaked Petri plates filled 0.7 was Seed clover pea comparable nontreated control; wheat reduced by 48%, 75%, 66%, respectively, compared control. suggested silt unlikely cause negative evaluated species.