Use of Field Lysimeters to Determine 14C-Dicamba Persistence and Movement in Soil

W. C. Koskinen, B. A. Sorenson, D. D. Buhler, D. L. Wyse, E. A. Strand, W. E. Lueschen, M. D. Jorgenson, H. H. Cheng

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3 Scopus citations

Abstract

Persistence and movement of 14C-dicamba was determined in the top 90 cm of a clay loam soil in 30 × 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% was still in the top 20 cm depth, small amounts of 14C (<0.1% 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 89% of the applied 14C remaining at 1 MAA in the top 10 cm of soil, 6% was dicamba and 27% was 3,6-dichloro-2-hydroxybenzoic acid. At 6 MAA, 50% of applied 14C was still present in the soil profile, 99% of which was in the top 20 cm of soil. Of the 54 % of the applied 14C remaining in the top 10 cm of soil, 11% was 3,6-dichloro-2-hydroxybenzoic acid, and we could not confirm any dicamba.

Original languageEnglish (US)
Pages (from-to)115-121
Number of pages7
JournalACS Symposium Series
Volume699
DOIs
StatePublished - 1998

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