Which of the following practices is often used to enhance soil fertility?

• A. Frequent mowing
• B. Crop rotation
• C. Continuous grazing
• D. Mono-cropping

Answer: (B)

Crop rotation is a practice that significantly enhances soil fertility by systematically alternating the types of crops grown on a particular piece of land over different growing seasons. This method is based on the understanding that different plants have varying nutrient requirements and that rotating crops can help maintain or improve the nutrient levels in the soil.

For instance, legumes such as beans and peas have the ability to fix atmospheric nitrogen into the soil, which can benefit subsequent crops that require nitrogen. By alternating between nitrogen-fixing crops and other varieties, soil fertility can be improved over time. Additionally, crop rotation helps to break the life cycles of pests and diseases, reducing the need for chemical fertilizers and pesticides, which can have detrimental effects on soil health.

In contrast, practices like frequent mowing do not directly influence soil fertility and primarily focus on managing biomass and maintaining a desired level of vegetation. Continuous grazing can lead to overgrazing, which depletes soil fertility and can result in soil erosion. Mono-cropping, or growing the same crop repeatedly on the same land, can deplete specific nutrients and increase vulnerability to pests and diseases, ultimately leading to reduced soil health and fertility.