title: Sorption of herbicides in relation to soil variability and landscape position.
abstract: Using the soil-water sorption partitioning coefficient (Kd), this study quantified the spatial variation of 2,4-D sorption by soil in an undulating-to-hummocky terrain landscape near Minnedosa, MB, Canada. Herbicide sorption was most strongly related to soil organic matter content and slope position, with greatest sorption occurring in lower landscape positions with greater soil organic matter content. The relation between sorption and slope position was more pronounced under conventional tillage (CT) than under long-term zero-tillage (ZT). Using multivariate regression and three independent variables (soil organic matter content, soil clay content and soil pH), the prediction of herbicide sorption by soil was very good for CT (R2 = 0.89) and adequately for ZT (R2 = 0.53).
authors.affiliation: Department of Soil Science, University of Manitoba, Winnipeg, Canada. farenhor@ms.umanitoba.ca
authors.forename: A
authors.initials: A
authors.lastname: Farenhorst
authors.forename: D
authors.initials: D
authors.lastname: Muc
authors.forename: C
authors.initials: C
authors.lastname: Monreal
authors.forename: I
authors.initials: I
authors.lastname: Florinski
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000032:analysis / Q000737:chemistry*; D000327:Adsorption; D002170:Canada; D004784:Environmental Monitoring; D006540:Herbicides / Q000032:analysis / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D016014:Linear Models; D009930:Organic Chemicals / Q000032:analysis; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism*; D012995:Solubility
chemical_list: D006540:Herbicides; D009930:Organic Chemicals; D012987:Soil; D012989:Soil Pollutants; D015084:2,4-Dichlorophenoxyacetic Acid