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22. Determine Your Soil's Potential for Leaching

soil leaching rating

To get a handle on how organic matter, texture, and permeability work together to affect pesticide movement, check with your Natural Resources Conservation Service (NRCS) office.

The NRCS has analyzed the characteristics of each soil type to determine its potential for leaching. With this information, NRCS places all soil types into one of three categories: high, intermediate, or low potential for leaching.

soil If one soil clearly dominates a field, select it as the representative soil type. If several soils dominate a field, determine the leaching potential for each one. Then gear your pesticide selection to the one that is most susceptible to leaching.
topographical map of illinois If the field has both fine-textured and coarse-textured soils, you may want to select two representative soils. Then determine the leaching potential for both.
pesticides However, knowing the soil's leaching potential is only part of the picture. To understand what these categories tell you, you also need to find out the pesticide's potential for leaching (Chapter 23). Then you need to put both pieces of information together with the soil-pesticide interaction screening procedure (Chapter 24).

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