Certified Crop Advisor Practice Exam

In order to increase soil organic matter levels, ________ must be reduced or eliminated?

1. Cover Cropping

2. Tillage

3. Fertilization

4. Irrigation

The correct answer is: Tillage

The correct response focuses on the impact of tillage on soil organic matter levels. Tillage involves the mechanical turning of soil, which can disrupt the soil structure, expose organic matter to oxygen, and accelerate its decomposition. This process ultimately decreases the amount of organic matter available in the soil. By reducing or eliminating tillage practices, farmers can help maintain and even increase soil organic matter levels. No-till or reduced-tillage methods allow organic residues to remain on the surface, promoting microbial activity and enhancing the formation of organic matter over time. This practice also supports better water retention and improves soil health overall. Other practices, such as cover cropping, generally enhance soil organic matter rather than detract from it. Similarly, fertilization and irrigation can indirectly influence soil organic matter levels but are not directly connected to its reduction like tillage is. Understanding the relationship between tillage and soil organic matter is crucial for sustainable agricultural practices and soil health management.