Bulletin Volume 1-29

Bulletin Volume 1-29

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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: ...definite amount of lime in a soil, the following points are found true: (1 ) A more rapid transformation of vegetable matter into humus. (2) The retention of humus against the oxidizing effects of hot climates. (3) Whether through the medium of this humus, or in a more direct manner, it renders adequate for profitable culture percentages of phosphoric acid and potash so small that in case of a deficiency of lime or its absence the soil would be practically sterile. (4) It tends to secure the proper maintenance of the conditions of nitrification, whereby the inert nitrogen of the soil is rendered available. This controlling influence of lime renders its determination alone a matter of no small interest, since its deficiency can very generally be cheaply remedied. Lime is among the most variable of soil constituents, existing in all proportions from mere traces to 30 per cent. in limestone soils. It is usually found in the form of calcium carbonate (limestone), calcium sulphate (gypsum), or calcium phosphate. Gypsum is somewhat soluble in pure water, and the carbonate and phosphate are soluble in rain water by virtue of the carbonic acid it contains. Hence, all three of these forms are capable of furnishing the lime so necessary for vigorous plant development. It is of unusual importance as a soil constituent, inasmuch as it is not only a necessary ingredient of plants, but it exerts a peculiarly beneficial effect on the physical properties of the soil. lllagnesia. This substance resembles lime in many of its properties, and is generally found accompanying it in rocks, especially in dolomite, or magnesian limestone. Epsom salts is a compound of magnesia with sulphuric acid. Magnesia is found in all cultivated soils, and seems to be...show more

Product details

  • Paperback | 110 pages
  • 189 x 246 x 6mm | 213g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236906233
  • 9781236906236