What does crop rotation refer to?

Crop rotation specifically refers to the practice of growing different types of crops in the same area over a sequence of seasons. The correct option, which addresses changing fields to utilize nutrients, highlights one of the primary benefits of crop rotation: it helps manage soil nutrients effectively. By varying the crops planted in a given field, different plants can replenish soil nutrients that might be depleted by a single crop's growth.

For instance, legumes can fix nitrogen in the soil, which benefits subsequent crops that might require higher nitrogen levels. This practice not only enhances soil health but also helps mitigate pest and disease issues, as rotating crops can disrupt the life cycles of specific pests and pathogens that tend to thrive on the same crop grown year after year.

The other options do not align with the fundamental concept of crop rotation. Planting multiple crops simultaneously relates more to intercropping rather than rotation. Planting the same crop each year reflects monoculture practices which can lead to nutrient depletion and increased pests. Lastly, using only organic fertilizers is unrelated to crop rotation, as crop rotation can be implemented with conventional or organic farming methods.