Certified Crop Advisor Practice Exam

What is the primary purpose of crop rotation?

1. to increase labor costs

2. to prevent disease buildup

3. to reduce soil erosion

4. to enhance weed growth

The correct answer is: to prevent disease buildup

The primary purpose of crop rotation is to prevent disease buildup. By alternating the types of crops grown in a specific field over seasons or years, the life cycles of pests and diseases that target a particular crop can be disrupted. When a different crop is planted, it does not provide the specific environment or host that the pests or pathogens need to thrive, ultimately reducing their populations and the likelihood of crop damage. Moreover, crop rotation can help maintain soil health and improve nutrient management. Different crops have varying nutrient requirements and rooting depths, which can help balance soil nutrient levels over time. This practice contributes to more sustainable agriculture by reducing reliance on chemical controls and promoting biodiversity in the ecosystem. In contrast, increasing labor costs, reducing soil erosion, and enhancing weed growth do not align with the central aim of crop rotation. While crop rotation can indirectly affect soil quality and weed populations, its main strategy revolves around disease and pest management and maintaining crop health.