actually
usually
in the fall, that adds nutrients and enriches the soil when it decomposes. Some green crops you can use include alfalfa, hairy vetch, and clover. Clover can be started while other crops are still growing without killing them. Clover needs very little moisture to thrive and will take over when your other crops are done. Alfalfa has very deep roots, which makes it ideal for breaking up soil. In addition to nitrogen, alfalfa adds protein and calcium to the soil. When these green manures begin to emerge in the spring, you can just break them up and work them into the soil. As they decompose, they will add more nutrients.