crop rotation maintains soil fertility. Why?
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Crop rotation improves the physical and chemical conditions of soil and thus improves the overall fertility. Nitrogen-fixing legumes such as soybeans and alfalfa in crop rotations fix atmospheric nitrogen into the soil through root nodules. This nitrogen is then available for subsequent crops.
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Crop rotation helps mitigate each of these effects. Different types of plants require different types of nutrients from the soil. Changing crops routinely allows the land to remain fertile, since not all of the same nutrients are being used each season. ... Crop rotation also helps to battle against the forces of erosion.
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