How pesticides move
Pesticides contaminate water sources as runoff. They can also volatise into air and then be transported distances, returning to the ground through precipitation. Leaching of pesticide occurs when the substance is moved through the soil in solution, usually with rainwater, and it percolates down to the water table. Heavy rainfall, particularly after a pesticide application, can drive the chemical deep into the soil, where breakdown tends to be slower. In water, pesticides do degrade
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