title: The effect of propanil co-application on 2,4-D sorption by soil.
abstract: The herbicide 2,4-D is often applied as a tank mixture in combination with other herbicide products. However, current information on 2,4-D sorption by soil is largely based on batch-equilibrium experiments without considering the competition of other herbicides for sorption sites by soil. This study quantified the effect of the herbicide propanil on the sorption of 2,4-D in soil. Results indicated that propanil competed with 2,4-D for sorption sites, particularly in soils with an organic carbon content greater than 3.6%. The decrease in 2,4-D sorption by soil, as a result of propanil competition, was most notably for herbicide concentrations that are typical of recommended field rates. We conclude that herbicide co-applications on agricultural fields have the potential to increase the mobility of herbicides in soil.
authors.affiliation: Department of Soil Science, University of Manitoba, Winnipeg, Canada. farenhor@ms.umanitoba.ca
authors.forename: Annemieke
authors.initials: A
authors.lastname: Farenhorst
authors.forename: Brent
authors.initials: B
authors.lastname: Prokopowich
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000737:chemistry*; D000327:Adsorption; D006540:Herbicides / Q000737:chemistry*; D006801:Humans; D011411:Propanil / Q000737:chemistry*; D012989:Soil Pollutants
chemical_list: D006540:Herbicides; D012989:Soil Pollutants; D015084:2,4-Dichlorophenoxyacetic Acid; D011411:Propanil