Farmers often grow legumes such as soybeans every few years and plow much of the plant parts into the soil. This practice serves mainly to replenish the soil with useful forms of ____.

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Legumes, such as soybeans, have a symbiotic relationship with nitrogen-fixing bacteria in their root nodules. These bacteria convert atmospheric nitrogen into forms that plants can use. When legume plant parts are plowed back into the soil, they enrich the soil with nitrogen, making it more fertile for future crops.

Farmers Often Grow Legumes Such as Soybeans Every Few Years