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Importance of Soil Organic Matter Fractions in Soil-Landscape and Regional Assessments of Pesticide Sorption and Leaching in Soil

Dep. of Soil Science, Univ. of Manitoba, Winnipeg, MB R3T 2N2 Canada

View larger version (12K): [in a new window]   Fig. 1. The effect of the concentration of the initial herbicide solution on the extent of 2,4-D sorption in a Long Plain sandy loam soil as determined by a batch-equilibrium experiment that utilized a 1:2 soil–solution ratio. The soil was obtained (0–10cm) from an agricultural field in Manitoba, Canada. Soil organic carbon content is 0.6%, soil pH is 7.7, and soil clay content is 13%. Data points are mean values (triplicates). Data from Reimer (2004).

View larger version (17K): [in a new window]   Fig. 2. The effect of soil organic matter characteristics on the sorption of 2,4-D. Data reflects mean values and standard deviation (triplicates). Data from Halabicki-Picton (2003).

View larger version (22K): [in a new window]   Fig. 3. Soil pH and Koc values for 2,4-D in an Ap-horizon along a 360-m transect running west to east in an agricultural field near Miami, Manitoba. Details on this study can be found in Gaultier et al. (2006). Data points are mean values (duplicates). The sample numbers 1, 2, 12, 20, 34, and 62 were further analyzed (triplicates) for soil organic matter characteristics (Farenhorst et al., 2005). The soil organic carbon content of these samples is given in parentheses after their numbers.