. Effective farming; a text-book for American schools . FiG. 20. — Cowpea root showing tubercles. ble. If the legumes are properly inoculated with bacteria, some of the nitrogen may remain for crops that grow later in the soil. Thus the land on which clovers or other legumes are growing is richer in nitrogen than before the crop was planted. This accounts for the good crops that usually follow legumes on a field. Legumes are often planted and, instead of being

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