OCR Text |
Show Gatherers of Nitrogen Are in Legume Family Nitrogen gatherers belong to the legume leg-ume or clover family, must of which take their nitrogen from the air and do not reduce the content of soil nitrogen. ni-trogen. These crops, when plowed down us green mnnures, ndd directly to the crop producing power of the soil. In order that the plant may obtain ob-tain Its nitrogen from the air the soil must originally contain or must be Inoculated with a speclnl type of bacteria, bac-teria, the presence of which Is noted by the growth of nodules-. upon the roots through which the nitrogen la obtained. |