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Effect of Soil pH on Degradation, Movement, and Plant Uptake of Chlorsulfuron

David R. Fredrickson and Patrick J. Shea
Weed Science
Vol. 34, No. 2 (Mar., 1986), pp. 328-332
Stable URL: http://www.jstor.org/stable/4044221
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effect of Soil pH on Degradation, Movement, and Plant Uptake of Chlorsulfuron
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Abstract

The influence of soil pH on the uptake, degradation, and movement of chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide} in soil was examined. Phytotoxicity decreased as pH increased in a silty clay loam with an adjusted pH range of 5.9 to 7.5. Fresh weights of sorghum [Sorghum bicolor (L.) Moench. 'Funks G-499 GBR'] shoots grown in soil at pH 7.5 and containing 0.8 or 1.6 ppbw chlorsulfuron were not different from the controls while large differences occurred at pH 5.9. Uptake of ¹⁴C-chlorsulfuron by wheat (Triticum aestivum L. 'Centurk') in a silty clay loam with a pH of 5.9 was 67 to 100% greater than at pH 7.5. Soil pH strongly influenced the degradation rate of chlorsulfuron in a laboratory incubation study. Chlorsulfuron half-life in a silty clay loam was 1.9 weeks at pH 5.6 and 10 weeks at pH 7.5. Soil thin-layer chromatography indicated a high leaching potential for chlorsulfuron, and mobility increased as soil pH was increased.

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