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Crop rotation.

Explanation:

Crop rotation is the method by which regular crops are cultivated after leguminous crops. Leguminous crop have nodules in their roots that has bacteria which fixes nitrogen for the plant which means that the plant produce their own fertilizer which can be used by the plant as well as a lot of nitrogen is also present for the other crop which increases productivity of the regular crops. The unavailability of nutrients is the main reason for the decrease of productivity. The main benefits of this method is increase productivity and nutrient level in the soil.