Bulletin Volume 10-37

Bulletin Volume 10-37

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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. 1888 edition. Excerpt: ...The investigations based upon Liebig's theory showed that other elements in addition to phosphorus must be used to secure the best results, and gradually commercial fertilizers containing other elements came to be manufactured and offered for sale. III. PRINCIPLES UNDERLYING THE USE OF FERTILIZERS. 2. Until fifty years ago, agriculture was without a scientific working basis. To the investigations of the illustrious German chemist, Justus von Liebig, we largely owe the advances that have been made in agricultural methods during the last half century. The following four laws, which form the foundation of modern agricultural practice, were fully established by Liebig: (1). "A soil can be termed fertile only when it contains all tlie materials requisite for the nutrition of plants, in the required quantity, and in the proper form.'1' (2). With every crop, a portion of these ingredients is removed. A part of this portion is again added from the inexhaustible store of the atmosphere; another part, however, is lost forever if not replaced by man." (3). "The fertility of the soil remains unchanged, if all the ingredients of a crop.are given back to the land. Such a restitution is affected by manure." (4). "The manure produced in the course of husbandry is not sufficient to maintain permanently the fertility of a farm; ii lacks the constituents which are annually exported in the shape of grain, hay, milk, and live stock." These four laws of Liebig contain a clear statement of the principles underlying the use of fertilizers; but, to understand their meaning with satisfactory clearness, we must know something more in detail about the following subjects: A. The Constituents And Food Materials Op Plants. B. The Constituents Of...show more

Product details

  • Paperback | 122 pages
  • 189 x 246 x 7mm | 231g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236640659
  • 9781236640659