. Agriculture for southern schools. d of this nitrogen gasuntil legumes have changed it into fertilizer nitrogen. Anyof the legumes, for example, the cowpea or clover, by theaid of the tubercles on its roots (Fig. 112), can grow onground where cotton, corn, or wheat would starve for wantof nitrogen. Not only do legumes get from the air enoughnitrogen to enable them to make luxuriant growth on apoor field, but they also enrich the soil with a part of thisnitrogen. When the roots and fallen leaves decay, thenitrogen in them is added to the soil. Still more is addedif the stems and leaves, as wel
. Agriculture for southern schools. d of this nitrogen gasuntil legumes have changed it into fertilizer nitrogen. Anyof the legumes, for example, the cowpea or clover, by theaid of the tubercles on its roots (Fig. 112), can grow onground where cotton, corn, or wheat would starve for wantof nitrogen. Not only do legumes get from the air enoughnitrogen to enable them to make luxuriant growth on apoor field, but they also enrich the soil with a part of thisnitrogen. When the roots and fallen leaves decay, thenitrogen in them is added to the soil. Still more is addedif the stems and leaves, as well as the roots, are left on thefield where the plants grew. That crops often grow muchlarger after a legume is shown in Fig. no. Each germ grows only on the kind of plant to which itis accustomed. —Every tubercle on the roots of legumes is 168 LEGUMES AND INOCULATION 169 inhabited by thousands of useful germs, or plants toosmall to be seen by the naked eye. When the tubercledecays, these germs are set free, and spread through the. Fig. 110. — SoEGHuji from Equal Areas In center, fertilized with rye; on left, with vetch, entire growth; on right, with vetch stubble. soil by means of water. These little workmen are must wait until the same kind of legume is planted 170 AGKICULTLTRE
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