Plant cuttings or trimmings that are left in the field/garden to decompose and add nutrients back into the soil. Many cover crops act as green manure, with gardeners plowing them back into the dirt prior to the growing season. Green manure can also act as a mulch to suppress weeds and keep soil moist. Crops such as alfalfa and barley make excellent green manure cover crops if you are looking to restore some health to your soil.
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