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Published online 27 October 2006
Published in Soil Sci Soc Am J 70:1991-1997 (2006)
DOI: 10.2136/sssaj2006.0091
© 2006 Soil Science Society of America
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Sorption of a Hydrophilic Pesticide

Effects of Soil Water Content

T. E. Ochsnera,*, B. M. Stephensb, W. C. Koskinena and R. S. Kookanac

a USDA-ARS, Soil and Water Management Research Unit, St. Paul, MN 55108
b Dep. of Soil, Water, and Climate, Univ. of Minnesota, St. Paul, MN 55108
c CSIRO Land and Water, PMB 2, Glen Osmond, SA 5064, Australia


Figure 1
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  		Fig. 1. Water content and pesticide distributions (sum of pesticide sorbed and in solution) after infiltration for loamy sand, silt loam, and silty clay loam at initial water contents of 0.05, 0.19, and 0.06 kg kg–1, respectively. The solid line denotes the location of the plane of separation.

 

Figure 2
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  		Fig. 2. Total pesticide concentration vs. solution volume for loamy sand, silt loam, and silty clay loam at initial water contents of 0.05, 0.19, and 0.06 kg kg–1, respectively. Only data from positions ahead of the plane of separation are included. Kd = sorption coefficient.

 

Figure 3
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  		Fig. 3. Water content and pesticide distributions (sum of pesticide sorbed and in solution) after vertical outflow for loamy sand at an initial water content of 0.24 kg kg–1. Data to the left of the solid line were used to estimate the sorption coefficient.

 

Figure 4
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  		Fig. 4. Total pesticide concentration vs. solution volume for loamy sand at an initial water content of 0.24 kg kg–1. Only data from positions to the left of the solid in Fig. 3 are included. Kd = sorption coefficient.

 




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