nitrogen is released, making it available to other plants and this helps to fertilize the soil. Most legumes have this association, but a few genera (e.g., "Styphnolobium") do not. In traditional farming practice, fields are rotated through various types of crops, which usually includes one consisting mainly or entirely of clover or buckwheat (non-legume family "Polygonaceae"), which are often referred to as "green manure".
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