Oklahoma Service Technician Practice Exam

What type of soil is known to slow pesticide movement into groundwater?

1. Sandy soil

2. Clay soil

3. Fine-textured soil with organic matter

4. Gravelly soil

The correct answer is: Fine-textured soil with organic matter

Fine-textured soil with organic matter is known to slow pesticide movement into groundwater due to its structure and composition. This type of soil typically has smaller particles, which creates a denser and more compact environment. The organic matter within this type of soil enhances its capacity to absorb water and hold onto chemicals, including pesticides. As a result, the movement of these chemicals is significantly slowed down, reducing the likelihood that they will leach into groundwater supplies. The combination of fine texture and organic content enhances the soil's retention capability, allowing it to bind with pesticides. This natural absorption prevents rapid downward migration, a critical consideration for environmental protection and sustainable pesticide management practices. Such soils play a vital role in minimizing the potential contamination of groundwater sources, which is essential for maintaining safe drinking water and preserving aquatic ecosystems.