Soils and Fertilizers

Soils and Fertilizers

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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. 1917 edition. Excerpt: ...set free, which will act on the litmus paper, giving it a decided pink color. 146. The Truog test.--In this test solutions of calcium chloride and zinc sulfide are brought in contact with the soil to be tested and the mixture is boiled. If the soil is acid, a gas called hydrogen sulfide is formed and driven off with the steam. The presence of this gas may be detected by placing a strip of moist lead acetate paper over the mouth of the flask in which the soil and solutions are boiled. The lead acetate paper is rapidly darkened by the hydrogen sulfide gas as it passes out of the flask. Detailed descriptions of the methods for making these tests for soil acidity will be found in the laboratory exercises. 147. Alkali soils.--We have seen that every soil is constantly undergoing decomposition, by which process a very minute fraction becomes soluble eveiy year. Ordinarily, in humid regions, this soluble matter is leached out by the rain water that percolates through the soil. In those parts of the world where the rainfall is very slight, and yet where decomposition of soil proceeds, there is a tendency for the soluble matter to accumulate in the soil where there is no drainage, or for it to move to places where seepage accumulates. A strong accumulation of such soluble matter is known as alkali because it usually has an alkaline reaction, i.e. it turns red litmus paper blue. 148. Nature and movements of alkali.--Because of its easy solubility, alkali may move from place to place or upward and downward in soils. During periods of drought it is carried upward by the capillary rise of the soil water, while during periods of rainfall it may move downward, where it is out of range of roots. The composition of alkali varies greatly in different regions. The...
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Product details

  • Paperback | 74 pages
  • 189 x 246 x 4mm | 150g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236620054
  • 9781236620057