Pedosphere 21(3): 380--388, 2011
ISSN 1002-0160/CN 32-1315/P
©2011 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Adsorption and desorption of methiopyrsulfuron in soils
WU Chun-Xian1,2, WANG Jin-Jun1, ZHANG Su-Zhi3 and ZHANG Zhong-Ming2
1 College of Plant Protection, Southwest University, Chongqing 400716 (China)
2 Institute for the Control of Agrochemicals of Sichuan Province, Chengdu 610041 (China)
3 Maize Research Institute, Sichuan Agricultural University, Ya'an 625014 (China)
      Methiopyrsulfuron is a new, low-rate, sulfonylurea herbicide for weed control in wheat; however, there is a lack of published information on its behavior in soils. In this study, methiopyrsulfuron adsorption and desorption were measured in seven soil samples from Heilongjiang, Shandong, Jiangxi, Sichuan, Anhui, and Chongqing provinces of China using a batch equilibrium method. The Freundlich equation was used to described its adsorption and desorption. Adsorption isotherms were nonlinear with the values of Kf-ads, the Freundlich empirical constant indicative of the adsorption capacity, ranging from 0.75 to 2.46, suggesting that little of this herbicide was adsorbed by any of the seven soils. Soil pH and organic matter content (OM) were the main factors influencing adsorption; adsorption was negatively correlated with pH and positively correlated with OM. Methiopyrsulfuron desorption was hysteretic on the soils with high OM content and low pH.
Key Words:  Freundlich equation, herbicide, hysteresis, organic matter, pH
Citation: Wu, C. X., Wang, J. J., Zhang, S. Z. and Zhang, Z. M. 2011. Adsorption and desorption of methiopyrsulfuron in soils. Pedosphere. 21(3): 380-388.
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