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B
Altering chemical nature of soil
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C
Improving soil fertility and yield
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D
Proliferating weeds
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Solution
The correct option is C Improving soil fertility and yield
Crop rotation refers to the practice of growing different types of crops in the same area over a sequence of seasons. 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. For example, planting a legume, such as soybeans, helps to replenish necessary nitrogen in the soil. Crop rotation has helped to increase productivity by replacing cultivated lands that has not been used for one or more seasons with growing different crops that replenish soil nutrients.