QAL Laws & Regulation Practice Exam

Why is conservation tillage beneficial for preventing pesticide contamination?

1. It increases the use of chemical fertilizers.

2. It creates a loose soil structure.

3. It retains organic matter and reduces erosion.

4. It helps in pest management directly.

The correct answer is: It retains organic matter and reduces erosion.

Conservation tillage is beneficial for preventing pesticide contamination primarily because it retains organic matter and reduces erosion. When soil is disturbed less frequently, as in conservation tillage practices, it helps maintain a more stable environment, which supports the growth of beneficial microorganisms and retains moisture and nutrients. This retention of organic matter improves soil structure and health, reducing the likelihood of runoff. Moreover, by minimizing soil erosion, conservation tillage helps prevent the movement of pesticides and other pollutants into waterways. Soil erosion can wash away pesticides applied to the soil surface, thereby contributing to contamination of nearby water sources. By promoting a stable soil structure and better water retention, conservation tillage reduces these risks significantly. Hence, the method serves as an effective practice for minimizing pesticide runoff and subsequently protecting water quality.