Which agricultural practice can reduce pesticide leaching into the soil?

Conservation tillage is an agricultural practice that can significantly reduce pesticide leaching into the soil. This method involves reducing the amount of tillage operations performed on the soil, which helps to maintain the soil structure. By leaving crop residues on the surface, conservation tillage enhances soil organic matter and increases its ability to hold water and nutrients.

With improved structure and organic matter, the soil can absorb and retain more water. This promotes better infiltration and reduces the likelihood that excess water will carry pesticides downward through the soil profile, minimizing leaching. Conversely, practices such as over-irrigation can lead to increased water movement through the soil, thus heightening the risk of leaching. Surface runoff manipulation might address water management but doesn't specifically target pesticide interactions with the soil. Lastly, high-pressure spraying can increase the risk of drift and potentially lead to more pesticide being washed away or leaching due to the force of application.

In summary, conservation tillage effectively promotes healthier soil ecology and better water management, which together contribute to reduced pesticide leaching, making it a reliable practice in sustainable agriculture.