. Productive agriculture . Red clover root. Alfalfa root. Fig. 32. — Note the long taproots and the nodules, which gather nitrogen and store it in the soil. they open up the soil deep down and improve its physical con-dition. 3. They store up a large proportion of protein, and are there-fore helpful in balancing the ration for all kinds of farm animals. 4. By rotating legumes insect life is checked. RED CLOVER 75 The growth of legumes in crop rotations has long been recog-nized as good farm practice. We shall study each of theseadvantages more fully. The legumes replace the nitrogen taken from
. Productive agriculture . Red clover root. Alfalfa root. Fig. 32. — Note the long taproots and the nodules, which gather nitrogen and store it in the soil. they open up the soil deep down and improve its physical con-dition. 3. They store up a large proportion of protein, and are there-fore helpful in balancing the ration for all kinds of farm animals. 4. By rotating legumes insect life is checked. RED CLOVER 75 The growth of legumes in crop rotations has long been recog-nized as good farm practice. We shall study each of theseadvantages more fully. The legumes replace the nitrogen taken from the soil by othercrops. Every farmer boy has observed the nodules thatgrow on the roots of leguminous crops. These nodules are fullof bacteria. They gather nitrogen from the soil, air and store itin the legume plant. Conditions that help bacterial growthshould, therefore, be provided as far as possible by the medium dry, fairly warm soil, which contains plenty of well-decomposed organic matter, will stimulate t
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