Which of the following is NOT considered a valid concern of right-of-way herbicide applications?

In the context of right-of-way herbicide applications, inactivation of a product from soil texture is not generally viewed as a valid concern. This is because herbicide effectiveness can often be affected by soil conditions, such as pH, organic matter, and moisture levels, rather than solely by the texture of the soil. Soil texture itself doesn't inhibit the effectiveness of the herbicides to a notable degree, as they can still be absorbed and act on target plants, depending on the formulation and properties of the herbicide.

In contrast, the other concerns listed are indeed valid and important when considering the application of herbicides. For example, poison residues on forages can pose significant risks to livestock if they consume treated plants. Similarly, non-target plant damage is a serious consideration, as herbicides can inadvertently affect desirable plants and ecosystems adjacent to the application site. Obtaining a special permit for water application is also a critical regulatory concern to prevent pollution and ensure safe application practices in sensitive areas.