Congressional Edition Volume 3985

Congressional Edition Volume 3985

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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. 1900 edition. Excerpt: ...from 0.1 per cent to 9 per cent. The general results of the experiments show that the amount of water lost from the pots containing 9 per cent solutions (which is equivalent to 2.2 per cent alkali, in a soil containing 25 per cent of the solution) was approximately one-half as much as that from soils containing the same percentage of pure water. The effect of the presence of soluble salts in the soil on the evaporation, in Buffum's experiments, was so much 1 Landolt and liornsteiu, "I'liys. Chcm. Tab.," S. 68. 'Bulletin No. 39, Wyoming Experiment Station, p. 55, 1898. greater than would be expected from the theoretical considerations given in the first part of this paper that the writer was led to believe that this difference was due to a change in the surface conditions of the soil from the accumulation of salts rather than from the presence of the salts in solution. In other words, either the formation of a mulch or the crusting of the soil at the surface had taken place, preventing evaporation to some extent. To test the validity of this opinion the following experiments were planned: (1) The evaporation of water from soils spread out in thin layers in large trays, one sample being moistened with distilled water and the other with a salt solution. The soils in both trays to be stirred from time to time in order to prevent any possible crusting of the soil. This would indicate whether the abnormal lessening of the evaporation observed by Buflfum was due to a surface condition. (2) The relative rate of evaporation in open dishes of pure water and solutions of the concentration used in experiment (1), as a check upon the conditions observed during that experiment. (3) Evaporation from the surface of soils packed in tall, more

Product details

  • Paperback | 150 pages
  • 189 x 246 x 8mm | 281g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236570324
  • 9781236570321