Extension Course in Soils
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Extension Course in Soils

Extension Course in Soils


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About the Book

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. 1916. Excerpt: ... LESSON VI. THE NITROGEN SUPPLY OF THE SOIL. (Ref. No. 2, pp. 110-119.) As stated in Lesson II, nitrogen is one of the most important elements of plant growth. Nearly four-fifths of the atmosphere, or over 70,000,000 pounds over each acre of land, is nitrogen. While this is sufficient to support plant growth for thousands of years, yet atmospheric nitrogen can not be utilized directly in plant growth but must first be combined in the soil with other elements before plants can absorb it. It will be the purpose of this lesson to explain how the nitrogen of the air becomes transformed so as to be used by plants and to discuss briefly the practical means of maintaining the soilnitrogen supply. Combined nitrogen in the atmosphere (Ref. No. 1, p. 22).--From the decay of vegetable and animal materials, burning, electrical discharges, and other causes the atmosphere derives certain substances, among which are ammonia and nitric acid, both compounds of nitrogen. These gases are readily absorbed by the moisture of the atmosphere, and when this moisture condenses and falls as rain or snow it carries with it into the soil the nitrogen compounds which it contains. While the available nitrogen thus added to the soil is not large, yet it is an appreciable quantity and contributes in a small way to the soil's fertility. The fixation of atmospheric nitrogen in the soil (Ref. No. 7, pp. 213223).--The nitrogen of the soil which plants require comes ultimately from the atmosphere. A large supply of this nitrogen is collected from the atmosphere in the soil through the action of microorganisms called bacteria. The nitrogen-fixing bacteria of the soil may be divided into two classes. One class lives independently in the soil and secures nitrogen direct from the air for its grow...


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Product Details
  • ISBN-13: 9781235613029
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 42
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 123561302X
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 95 gr


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