Which factor does NOT typically affect herbicidal persistence?

Herbicidal persistence refers to the length of time a herbicide remains active in the environment before it breaks down or becomes ineffective. Various factors can influence this persistence, including those related to environmental conditions and chemical properties.

Temperature plays a crucial role in the breakdown of herbicides; higher temperatures typically increase chemical activity and can lead to quicker degradation. Similarly, soil moisture content is important because too much or too little moisture can affect how herbicides are absorbed and how long they remain effective in the soil. The chemical structure of a herbicide is also a significant factor, as different molecules break down at different rates depending on their stability and the processes that degrade them in the environment.

In contrast, the species of wildlife present does not directly affect how long a herbicide remains active. While wildlife may interact with the herbicides (such as through feeding, which can lead to exposure), their presence does not change the persistence of the chemical in the environment. Thus, the wildlife species present is not a determining factor regarding herbicidal persistence.