Proceedings of the Annual Meeting of the Iowa State Improved Stock-Breeders' Association Volume 18

Proceedings of the Annual Meeting of the Iowa State Improved Stock-Breeders' Association Volume 18

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ...have grown will not furnish an infusion that will revive and stimulate serradella lupina or vice versa. The inference is inevitable that the bacteria, while similar, are not the same. Yet the legumes do avail themselves of nitrogen in the soil. Sterilize the soil and add an llnSl.lfilcl6l.ll'1 quantity of nitrogen and some growth follows. Water with the infusion from some soil in which the same species of legume has grown and it-will eventually thrive, but during the interval between the exhaustion of soil, nitrogen and the development of bacterial formation, there will be a hunger period. In sterilized earth no tubercles appear on the roots of legumes; if a soil infusion that has been boiled is added no tubercles appear, and. of course, no power to assimilate nitrogen is developed. If on one side of a culture pot a suitable soil infusion is poured and the other is watered with the same infusion boiled, tubercles develop on the roots on one side and the roots on the other side starve. ' Time forbids further citation of the many changes made in the experimental conditions which invariably cause variations in the result that prove the same point. I cannot do better than conclude with this quotation from Prof. Hellriegel, which is abundantly sustained by his experiments: "I hold it is certain that the legumes experimented with have the power, with the assistance of microbes, to employ the free, elementary nitrogen of the atmosphere for their nourishment, and to collect it in the form of albumen. This source of nitrogen is inexhaustible, and will alone, under favorable growth conditions, sufiice for the needs of the legumes and enable them to make a normal and even a luxurient growth." JaMEs W1LsoN--You will remember that a more

Product details

  • Paperback | 86 pages
  • 189 x 246 x 5mm | 168g
  • United States
  • English
  • black & white illustrations
  • 1236772601
  • 9781236772602