Technical Bulletin Volume 27-54

Technical Bulletin Volume 27-54

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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. 1916 edition. Excerpt: ...with the length of time given for the decomposition to take place. For the same length of time, the soil containing dried blood, with its less amount of added organic matter for an equivalent amount of nitrogen, contained in the tankage and cotton seed meal dissolved more inorganic matter during its decomposition than either of the other two. Another thing to be learned from these experiments is that theconcentration of the solution varies and this variation depends upon how much organic matter there is present for the microorganisms to decompose. Therefore the soil solution seems to be a satisfactory means of studying the microbial changes in the soil, i. e., fertility conditions. SUMMARY Dissatisfied with the results obtained from a study of the kind and number of microorganisms in the soil, investigators proceeded to study their physiological activities for more definite data. Various methods have been used. The solution as suggested by Remy, Hiltner and Stormer, and by Lohnis is not considered satisfactory because conditions vary too much from those in the soil. To approach soil conditions, sterilized soil, air dried soil and fresh soil have been used by different investigators. The last one is the best because it approaches nearest field conditions, but it becomes necessary to extract from it the liquid phase. The writer used the soil solution as obtained by the van Suchtelen and Itano method for the study of the microbial changes in the soil. This solution was used in the study of the decomposition of organic nitrogenous substances as dried blood, tankage, cotton seed meal, bone matter added. The dried blood gave quicker results than the others on account of its being more rapidly decomposable than any of the others. ' meal and hoof...show more

Product details

  • Paperback | 288 pages
  • 189 x 246 x 15mm | 517g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236942779
  • 9781236942777