My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in JEQ

  1. Vol. 38 No. 1, p. 164-170
     
    Received: Nov 14, 2007
    Published: Jan, 2009


    * Corresponding author(s): jmxu@zju.edu.cn
    scott.yates@ars.usda.gov
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/jeq2007.0607

Kinetic Distribution of 14C-Metsulfuron-methyl Residues in Paddy Soils under Different Moisture Conditions

  1. H. Z. Wanga,
  2. J. Ganb,
  3. J. B. Zhangc,
  4. J. M. Xu *d,
  5. S. R. Yatese,
  6. J. J. Wuf and
  7. Q. F. Yeg
  1. a Inst. of Soil and Water Resources and Environmental Science, Zhejiang Univ., Hangzhou 310029, China; Zhejiang Provincial Key Lab. of Subtropical Soil and Plant Nutrition, Hangzhou 310029, China; Dep. of Environmental Sciences, Univ. of California, Riverside, CA 92521; USDA-ARS, Salinity Lab., Riverside, CA 92507
    b Dep. of Environmental Sciences, Univ. of California, Riverside, CA 92521
    c Inst. of Soil Science, Chinese Academy of Sciences; State Key Lab. of Soil & Sustainable Agriculture, Nanjing 210008, China
    d Inst. of Soil and Water Resources and Environmental Science, Zhejiang Univ., Hangzhou 310029, China; Zhejiang Provincial Key Lab. of Subtropical Soil and Plant Nutrition, Hangzhou 310029, China
    e USDA-ARS, Salinity Lab., Riverside, CA 92507
    f Inst. of Soil and Water Resources and Environmental Science, Zhejiang Univ., Hangzhou 310029, China; Zhejiang Provincial Key Lab. of Subtropical Soil and Plant Nutrition, Hangzhou 310029, China
    g Inst. of Nuclear-Agricultural Science, Zhejiang Univ., Hangzhou 310029, China

Abstract

Rice paddy soils undergo several cycles of drying and wetting during a growing season. A laboratory study was conducted to determine the effect of soil moisture conditions on the distribution and kinetics of extractable and bound residues of 14C-metsulfuron-methyl in six Chinese paddy soils during 84 d of incubation at 15°C with moisture contents varying from 20 to 50% of the field water-holding capacity. The amount of extractable residues consistently increased and bound residues decreased with increasing soil moisture content. At the end of the incubation experiments, extractable residues and bound residues accounted for 34.5 to 84.4% and 11.6 to 53.3% of applied radioactivity in soils, respectively. Soil pH and soil microbial biomass carbon were the most predominant factors affecting the formation and relative distribution of herbicide residues between extractable and bound residue forms. In high-pH soils, bound residues decreased and extractable residues increased, suggesting an increased leaching risk for metsulfuron-methyl in alkaline soils. High precipitation rates, along with the common practice of liming in southeastern China, may lead to enhanced herbicide leaching as well as phytotoxicity to rotation plants and should be considered in overall pest management practices.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © 2009. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyAmerican Society of Agronomy, Crop Science Society of America, and Soil Science Society of America