title: Field persistence studies with herbicides in prairie soils.
mesh_terms: D002170:Canada; D002849:Chromatography, Gas; D006540:Herbicides / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis; D012987:Soil / Q000032:analysis*; D013997:Time Factors
chemical_list: D006540:Herbicides; D010573:Pesticide Residues; D012987:Soil