Which method is NOT a way that a pesticide can move from the application site?

Soil adsorption is a process wherein pesticides bind to soil particles, thereby reducing their mobility in the environment. This mechanism helps to keep the pesticide in place at the application site, as the particles clinging to the soil are less likely to move away from that location. Because of this property, soil adsorption acts as a barrier that limits the movement of pesticides into surrounding areas, differentiating it from other methods of pesticide movement.

In contrast, volatilization involves the conversion of pesticides from a liquid to a gaseous form, allowing them to enter the atmosphere and travel away from the application site. Runoff refers to the movement of pesticides over the surface of the soil, especially during rain events, while leaching is the process where water-soluble pesticides are carried downward through the soil profile, potentially reaching groundwater supplies. Each of these processes is a mechanism by which pesticides can transit away from the original application area, making soil adsorption the outlier in this context.