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J Agric Food Chem. 2007 Oct 3;55(20):8193-9. Epub 2007 Sep 12.

Effect of drip application of ammonium thiosulfate on fumigant degradation in soil columns.

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1
Department of Plant Sciences, University of California, Davis, 1636 East Alisal Street, Salinas, California 93905, USA. rqin@fresno.ars.usda.gov

Abstract

Low permeability tarps can effectively minimize fumigant emissions while improving fumigation efficacy by retaining fumigants under the tarp. However, when planting holes are cut through the tarps, high-concentration fumigants may be released and result in environmental and worker safety hazards. In a 11-day column study, we explored the effect of drip irrigation application of ammonium thiosulfate (ATS) on 1,3-dichloropropene (1,3-D) and chloropicrin (CP) degradation in soil. Decrease of 1,3-D and CP concentrations in soil-gas phase followed a three-parameter logistic equation for all treatments. It was slowest in the control with a half-life ( t 1/2) of 86.0 h for 1,3-D and of 16.3 h for CP and most rapid when ATS was applied at 4:1 ATS/fumigant molar ratio with a half-life of 9.5 h for 1,3-D and of 5.5 h for CP. Our results indicate that applying ATS via the drip-irrigation systems to soil can accelerate fumigant degradation in soil and thus reduce emissions. This technical solution may be applicable in raised-bed strawberry production where drip-application of fumigants under tarps has become common.

PMID:
17848085
DOI:
10.1021/jf071946w
[Indexed for MEDLINE]
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