Soil incorporation is most commonly used for which of the following types of applications?

Soil incorporation is a technique primarily utilized for applications involving soil-applied herbicides. This method enhances the efficacy of these herbicides by ensuring that the active ingredients are mixed into the soil profile, which facilitates better uptake by target plants while minimizing the potential for off-target effects.

When herbicides are incorporated into the soil, they can interact with the target plants through their root systems, improving absorption and therefore enhancing their effectiveness against undesirable vegetation. This method also helps in reducing vaporization or runoff, providing a more controlled and focused application.

In contrast, other types of applications like foliar sprays or liquid insecticides are designed to be applied directly onto plant surfaces, where they act on the leaves or stems rather than needing soil contact. Granular herbicides may sometimes be spread on the surface but do not necessarily require incorporation into the soil to be effective, as their formulation can allow for efficacy without deep soil interaction. Therefore, soil incorporation is most relevant and beneficial in the context of soil-applied herbicide applications.