Which item is NOT a groundwater reach determinant?

• A. Crop type
• B. Pesticide properties
• C. Soil properties
• D. Site conditions

Answer: (A)

Groundwater reach is governed by how a pesticide moves through soil and water, which depends on the chemical’s properties, the soil characteristics, and the site conditions. The pesticide’s properties—such as its water solubility, tendency to sorb to soil particles, degradation rate, and overall persistence—directly affect how readily it can move downward. Soil properties, including texture (coarse vs. fine), organic matter content, and the depth to groundwater, shape how easily the chemical can percolate or be retained. Site conditions like rainfall, irrigation practices, and drainage determine the actual amount of water moving through the soil to reach groundwater. Crop type doesn’t determine the physical transport to groundwater; it may influence when or how a pesticide is applied, but it isn’t a determinant of whether the chemical will reach groundwater.