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Title: FACTORS INFLUENCING THE FORMATION OF SOIL-BOUND HERBICIDE RESIDUES

Author
item CLARK, KENLYN - UNIV OF ILLINOIS
item SIMS, GERALD
item HASSETT, JOHN - UNIV OF ILLINOIS

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 10/29/1995
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The objective of this study was to determine to what extent factors in soil, such as intraparticle diffusion and moisture content, influence the formation of soil-bound herbicide residues. One segment of the experiment employed a Flanagan silty clay loam soil (fine, montmorillonitic, mesic, aquic argiudoll) with soil-bound 14C-clomazone residue and compared extractable levels of clomazone in a sample screened through a 2 mm mesh to that of a sample pulverized in a disc mill. The data indicated that physical entrapment played a minor role in the availability of clomazone under non-sterile conditions. Extraction of the same soil with citrate-dithionite showed that levels of bound residue incorporated into the organic matter were proportional to the soil-bound residue content of the soil at different moisture levels, suggesting incorporation of clomazone into soil organic matter. The temperature dependence and correlation of bound residue and mineralization data suggested a major role for microbial activity in soil-bound residue information.