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A crop, such as winter rye or clover, planted between periods of regular crop production to prevent erosion and typically turned under before maturity to increase the soil's organic matter and nitrogen content.
(Agriculture) a crop planted between main crops to prevent leaching or soil erosion or to provide green manure
a crop, usu. a legume, planted to keep nutrients from leaching, soil from eroding, and land from weeding over, as during the winter.