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What kind of advantage a farmer gets whe...

What kind of advantage a farmer gets when he grows a leguminous crop (e.g., pea, soyabean) between two cereal crops ?

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A leguminous crop fixes atmospheric nitrogen with the help of nitrogen fixing bacteria. It helps in the addition of nitrogen into the soil without adding extra nitrogenous fertilizer to the soil. This practice helps a farmer to save the money wasted for fertilizer as well as helps to raise a pollution free crop and increase the yield.
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