Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 11/14/2002
Publication Date: 11/14/2002
Citation: Kim, J.H., Gan, J., Farmer, W.J., Papiernik, S.K., Dungan, R.S., Yates, S.R. 2002. Organic matter effects on phase partition of 1,3-dichloropropene in soil. Abstracts. Indianapolis, IN. Nov. 10-14, 2002.
Technical Abstract: The fumigant 1,3 -dichloropropene (1,3-D) is considered a major replacement or methyl bromide (MeBr), which is scheduled to be phased out by 2005 in the United States. This study was conducted to better understand phase partitioning of 1,3-D and the role of organic matter in its adsorption to soil. Partitioning of 1,3-D between air and water (KH) and soil and water (Kf) was determined by quantifying the concentration in both phases upon equilibrium. At 20C, the KH of (Z) - and (E) -1,3-D was 0.052 and 0.033, respectively. In three California soils, the Kf (mg/L) of the 1,3-D isomers ranged from 0.39 to 0.60, and the Koc ranged from 35 to 60. The relatively high KH and low Kf imply that 1,3 -D is highly mobile in most soils after subsurface application. Adsorption of 1,3 -D, in native soils and soils amended with composted manure, increased with increasing soil organic matter content. This suggests that organic wastes can be applied to soil to increase 1,3 -D adsorption, thus reducing its potential for offsite movement.