Which soil factor does NOT influence herbicide adsorption?

Soil temperature is a factor that does not significantly influence herbicide adsorption because adsorption primarily depends on the chemical properties of the herbicide and the physical characteristics of the soil, such as its texture, organic matter content, and clay type.

Organic matter content plays a crucial role in herbicide adsorption, as organic matter can bind to certain herbicides, influencing their availability and effectiveness. Soil texture, which refers to the proportion of sand, silt, and clay in the soil, affects how well herbicides can be held in the soil. Different textures can influence the surface area available for adsorption and the retention of herbicides. Clay type is also important because different clay minerals have varying capacities to adsorb chemicals based on their surface charge and structure.

In contrast, while temperature can affect the solubility and volatility of herbicides, it does not directly influence the adsorption process. Since adsorption is more closely related to the interactions between herbicide molecules and soil particles, soil temperature is not a determining factor in this particular process.