Which of the following can indicate bad site conditions for pesticides regarding leaching?

High rates of rainfall can significantly indicate bad site conditions for pesticides regarding leaching. When heavy rain occurs, it can lead to increased water movement through the soil profile. This can result in the vertical movement of pesticides beyond the target area, potentially reaching groundwater and contaminating drinking water sources. The greater volume of water not only carries pesticides more efficiently but also can saturate the soil, reducing its capacity to absorb and retain chemicals, thereby enhancing the risk of leaching.

In contrast, low rainfall would typically lead to less leaching since there’s less water available to move through the soil. Deep soil might provide more volume for pesticide absorption and retention, while flat terrain can impact drainage patterns but doesn’t directly indicate leaching issues.