Which action helps prevent pesticide runoff from tilled fields during irrigation or rainfall?

• A. Avoid applying before heavy precipitation
• B. Install vegetative strips
• C. Use buffer zones
• D. Apply at recommended rates and times to match soil absorption

Answer: (D)

Preventing runoff comes down to how much pesticide actually gets into the soil and when it’s applied. If you apply more pesticide than the soil can absorb or hold at that moment, the excess remains on the surface or near-surface and can be washed away by irrigation or rainfall. By applying at the labeled rates and at times that match the soil’s absorption capacity, you keep the input within what the soil can take up, bind to, and infiltrate. This minimizes the amount available to be carried off with water, directly reducing runoff risk. Soil texture, organic matter, and moisture level affect absorption, so following the recommended rates and timing accounts for these variables and is the most reliable way to prevent runoff. While waiting for rainier days, using vegetative strips, or establishing buffer zones can also help, they are supplementary; the most direct prevention is aligning application with soil absorption.