Which of the following practices can help minimize leaching of pesticides?

Applying the minimum rate of pesticides on sandy soils is an effective practice for minimizing the leaching of pesticides. Sandy soils have larger particles and a lower capacity to retain moisture and nutrients compared to clay or loamy soils, which can lead to quicker movement of pesticides through the soil profile and potentially into groundwater. By applying only the necessary minimum amount of pesticide, it reduces the concentration in the soil that could leach away with water.

This practice helps ensure that the pesticides remain effective in the target area while decreasing the likelihood of them moving beyond the root zone and into water sources. It is crucial to use only what is needed, as excessive application can lead to runoff and leaching, harming the environment.

In contrast, applying in saturated soil conditions can lead to increased runoff and leaching as the soil cannot absorb any more water. Using pesticides with low adsorption to soil is also problematic because these pesticides are more likely to move with water through the soil. Lastly, irrigating within 24 hours of application can mobilize pesticides through the soil faster than desirable, increasing the chances of leaching rather than minimizing it.