Influence of organic carbon on reductive dechlorination of thiobencarb in California rice field soils |
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| Authors: | Schmelzer Kara R Johnson Catherine S Viant Mark R Williams John F Tjeerdema Ronald S |
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| Institution: | Department of Environmental Toxicology, College of Agricultural and Environmental Sciences, University of California, Davis, CA 95616, USA. |
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| Abstract: | The herbicide thiobencarb is suspected of causing delayed phytotoxicity syndrome (DPS) in rice plants. While the ultimate agent appears to be its dechlorinated product (deschlorothiobencarb), the influence of organic carbon on the formation of deschlorothiobencarb in California rice field soils has not been investigated. Thus, two different soils were compared for their ability to reductively dechlorinate thiobencarb with carbon augmentation: one from the eastern Sacramento Valley, which has historically displayed DPS, and one from the western Sacramento Valley, which has not. Rice straw was homogenized into samples of each soil to produce 0, 0.33 or 2% organic carbon augmentation. During 90-days of anoxic incubation, substantial deschlorothiobencarb production was measured in both soil types. However, only the thiobencarb degradation rate in the eastern valley soil was positively correlated with carbon content. Thus, other characteristics of DPS-resistant soils may limit deschlorothiobencarb formation. |
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| Keywords: | rice thiobencarb delayed phytotoxicity syndrome dechlorination deschlorothiobencarb organic carbon |
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