Pesticide adsorption is greatest in coarse, sandy soil. This statement is:

Pesticide adsorption refers to how tightly a pesticide binds to soil particles. In general, adsorption is influenced by soil texture, organic matter content, and the chemical properties of the pesticide itself. Coarse, sandy soils have larger particles and greater pore spaces, which often allows for a faster movement of water and pesticides through the soil profile, leading to reduced adsorption levels. This means that pesticides are less likely to cling to sandy soil particles and are more mobile, making it easier for them to leach or wash away.

In contrast, finer textured soils, like clay or silt, have smaller particles with a larger surface area, which can hold onto pesticides more effectively. Additionally, higher organic matter content can also increase adsorption due to the interactions between organic matter and pesticide molecules.

Therefore, the statement claiming that pesticide adsorption is greatest in coarse, sandy soils is inaccurate, as these types of soils are typically associated with lower adsorption of pesticides.