How Plants Are Trained to Work for Man; Gardening Volume 5

How Plants Are Trained to Work for Man; Gardening Volume 5

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ...their departure from the traditions of their kind by manifesting a tendency to sprout even while the tomato top was still growing vigorously. Perhaps these results, as regards both the, relative normality of the tomatoes borne by the grafted vine, and the abnormality of the potatoes grown by the roots, might have been expected. At least they seemed quite explicable. It will be recalled that the conditions of plant growth were detailed somewhat at length in the first chapter of the present volume, and that it was there pointed out that the plant roots absorb from the soil about them mineral salts in solution that are carried up to the leaves of the plant before they are transformed into organic matter by combination with carbon drawn from the air. It was noted that the organic compounds thus manufactured in the leaves of the plant must be sent back down the stem of the plant to be deposited, in case of a tuber-forming plant like the potato, in connection with the roots in the ground. It follows, then, that the tomato plant, even though its source of supply was the root system of a potato, merely gained from these roots part of the raw inorganic materials with which its leaves were to manufacture the special compounds that go to make up a tomato. Inasmuch as the tomato leaves were themselves unmodified, there was no reason why their product, the tomato, should be greatly modified. In receiving its supply of raw material from a foreign root, the tomato top was in no different condition from the ordinary cions in a fruit orchard, which, as we have seen, are habitually grafted on roots or branches of a foreign species. But the case of the potato tubers is obviously quite different. Their substance is made up of material that came originally, to be...show more

Product details

  • Paperback | 62 pages
  • 189 x 246 x 3mm | 127g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236546253
  • 9781236546258