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What is the primary concern regarding pesticides in sandy soils?

  1. They can wash away easily

  2. They adhere too much to the soil

  3. They become ineffective

  4. They are absorbed quickly

The correct answer is: They can wash away easily

The primary concern regarding pesticides in sandy soils is that they can wash away easily. Sandy soils have larger particle sizes and higher drainage capabilities, which means that when it rains or irrigation occurs, water can carry away pesticides, reducing their effectiveness and potentially leading to environmental contamination. This leaching can occur before the pesticide has had a chance to work on the target pests. The rapid drainage associated with sandy soils also means that there is less opportunity for the pesticide to bind to the soil particles, increasing the risk of runoff into nearby water bodies. Understanding this property is critical for applicators in order to implement best management practices and reduce non-target exposure.