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50 Ways Farmers Can Protect Their Groundwater
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24. Determine the Soil-pesticide Interaction Rating

soil-pesticide interaction for leaching

If you know your soil's potential for leaching and your pesticide's potential leaching, you are ready to determine the soil-pesticide interaction rating.

You should know whether your soil has a high, intermediate, or low potential for leaching. You should also know whether your pesticide has a large, medium, small, or extra small potential for leaching. To see how these factors interact, refer to this chart.

High potential If you end up with a high soil-pesticide interaction rating, that means the pesticide has a high probability of leaching out of the rooting zone. To reduce the risk of groundwater contamination, consider using an alternative pesticide or another pest-management technique that does not involve a pesticide.
Moderate Potential If you end up with a moderate rating, the pesticide will leach below the rooting zone more often than not. To reduce the risk, consider lower application rates, other application techniques, or a different time of application. Also, consider using a different pesticide that has a lower potential for leaching or pest-management practices that don't involve a pesticide. Additional on-site evaluation is necessary to determine how sensitive groundwater is to contamination.
low or very low potential If you end up with a low soil-pesticide interaction rating, the pesticide has a low probability of leaching out of the rooting zone. And if you have a very low interaction rating, the pesticide has a very low probability of being lost through leaching. Minimize hazards by following the label.
wate nozzel Keep in mind that these ratings serve only as guidelines. They do not consider every factor that influences leaching. Therefore, use the ratings as a system to alert you to a potential problem, but not as an exact measurement of leaching potential.

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