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United States Department of Agriculture

Agricultural Research Service

Title: Use of Field Lysimeters to Determine 14c Dicamba Persistence and Movement in Soil

Authors
item Koskinen, William
item Sorenson, B - UNIVERSITY OF MINNESOTA
item Buhler, Douglas
item Wyse, D - UNIVERSITY OF MINNESOTA

Submitted to: American Chemical Society Symposium Series
Publication Type: Book / Chapter
Publication Acceptance Date: November 15, 1997
Publication Date: N/A

Technical Abstract: Persistence and movement of 14C-dicamba was determined in the top 90 cm of a clay loam soil in 30 x 100 cm intact soil lysimeters in the field during a 16-mo period. All of the applied 14C was still in the profile 1 month after application (MAA). Although 97 percent was still in the top 20 cm depth, small amounts of 14C (less than 0.1 percent of applied) were found at the 80-90 cm depth. This was the only time during the study that 14C was found this deep. Of the extractable 14C in the top 20 cm of soil, 14 percent was dicamba and 78 percent was 3,6-dichlorosalicylic acid. At 6 MAA, 50 percent of applied 14C was still present in the soil profile, 99 percent of which was in the top 20 cm of soil. Of the extractable 14C in the top 20 cm of soil, 7 percent was dicamba and 41 percent was 3,6-dichlorsalicylic acid.

Last Modified: 12/17/2014
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