|Clay, Sharon - SOUTH DAKOTA STATE UNIV|
Submitted to: Weed Science Society of America Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: February 9, 2001
Publication Date: N/A
Technical Abstract: Sorption-desorption is one of the most important processes affecting the transport of herbicides through soil since it controls the amount of chemical available for transport. Sorption is usually characterized by determining surface soil sorption coefficients that are then used in solute transport models. Significant drawbacks to using surface soil sorption coefficients to predict transport are the spatial variability of 1) surfac soil properties over large fields and 2) soil properties in the soil profile. The objective is to give an overview of how herbicide sorption and desorption is influenced by changes in soil properties with depth. This will be illustrated using several herbicides, i.e. atrazine, alachlor, sulfometuron methyl, and tebuthiuron. Results indicate that correlations between sorption-desorption and soil properties of surface soils cannot be used to characterize these properties in subsurface soils.