What is the term for the attraction of herbicide molecules to soil particles?

The term that describes the attraction of herbicide molecules to soil particles is adsorption. In this context, adsorption refers to the process by which herbicide molecules adhere to the surface of soil particles, often forming a bond on the surface. This process is crucial as it affects the mobility, availability, and efficacy of the herbicide in the environment.

Adsorption is influenced by several factors, including the chemical properties of both the herbicide and the soil, such as pH, organic matter content, and soil texture. When herbicides are adsorbed onto soil particles, their movement through the soil profile is limited, which can impact how effective the herbicide is in controlling target weeds.

This concept contrasts with absorption, which involves the uptake of substances into the interior structure of another material, typically within a plant or other organisms. Desorption refers to the process where adsorbed molecules are released back into the solution, while sequestration involves the process of isolating a substance in a way that reduces its biological activity or availability. Thus, understanding adsorption is essential for effective herbicide application and management in agricultural practices.