These plants are good cover cops because they perform photosynthesis and exude a sap like liquid from the roots into the soil to feed soil organisms.
Legumes are plants that bear their seeds in pods. They differ markedly from grasses, cereals and other non-legume crops because much of the nitrogen they require is produced through fixation of atmospheric nitrogen by bacteria in nodules on their roots. As a result, legumes are rich in protein.
What are cover crops?
Basically, cover crops are anything else that is planted on a farm or in soil with purpose. Why would a farmer spend the effort and money to seed crops he can't sell when cover crops are sown (as opposed to weeds that merely grow)? Because of the nitrogen fixation of the soil.
Hence, the nitrogen fixation of soil is one of the points that makes these plants good cover crops.
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