Which of the following factors impacts the effectiveness of a herbicide?

The effectiveness of a herbicide is significantly influenced by soil composition, moisture, and weather conditions. Soil composition determines the availability of nutrients and the structure of the soil, which can impact how readily a herbicide can be absorbed and interact with plant targets. For instance, certain soil types may bind herbicides more tightly, reducing their effectiveness.

Moisture levels are also critical, as herbicides often require adequate water to activate and be absorbed by plant roots or foliage. If the soil is too dry, the herbicide may not dissolve properly or reach the plants effectively. Additionally, weather conditions such as temperature and wind can affect herbicide application and its performance. High temperatures may cause rapid evaporation, while windy conditions can result in drift, causing the herbicide to land on unintended areas and not on the target plants.

In contrast, factors like the type of plant treated can influence outcome related to susceptibility but do not inherently affect a herbicide's performance across varying environments. Similarly, the cost and brand name of the herbicide may reflect its marketing or formulation but are not directly tied to its effectiveness under diverse agricultural conditions.