Overuse of fertilizers can cause chemical burn which damages the soil ecology. In combination with tilling it will gradually destroy the soil quality. Pestici

Overuse of fertilizers can cause chemical burn which damages the soil ecology. In combination with tilling it will gradually destroy the soil quality. Pesticides destroy insect diversity, including predatory insects that keep pests in check. This is particularly problematic because pest populations tend to recover more quickly than predator populations, so if you stop spraying the problem comes back worse. Pesticides can also harm bird and amphibian populations, which play a role in pest control.