Bulletin Volume 130-154

Bulletin Volume 130-154

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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. 1922 edition. Excerpt: ...said for larch needles. White pine needles greatly retarded nitrogen fixation when applied in 1 percent concentration, stimulated it at 2 percent, and resulted in a loss at 3 percent. The results from applications of white fir are inconsistent since 3 percent stimulated and 1 and 2 percent each resulted in a loss. Maple leaves brought about a consistent retarding influence. Yellow pine needles and red fir needles resulted in a stimulation of nitrogen fixation; this is true of the latter especially. All of the sawdusts stimulated nitrogen Ifixation when applied in amounts of 1 and 2 percent, while larch, red fir, and white fir stimulated in 3 percent concentration. With the exception of ash, none of the sawdusts brought about a marked inhibition, even in 3 percent applications. Ammonia and Nitrate Accumulation Thirty-one of the samples of forest soil were tested for ability to accumulate ammonia from blood, and nitrate from ammonium-sulphate and blood. All soils were capable of accumulating ammonia from blood. Three samples from virgin forest soil were outstandingly low. While ammonia accumulation in these soils may not be regarded as high, it is apparent that blood is decomposed with the accumulation of ammonia. It also is apparent that cropping increases the rate of ammonia accumulation. Sixteen of the 31 samples were lacking in the ability to form nitrate from ammonium sulphate or blood. They were not benefited in this respect by the addition of calcium carbonate. Fifteen samples were able to form small amounts of nitrate from ammonium sulphate and larger amounts from blood. While this took place in the absence of calcium carbonate, it was greatly stimulated by its presence. Soils not able to form nitrate were largely those bearing...
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Product details

  • Paperback | 344 pages
  • 189 x 246 x 18mm | 617g
  • United States
  • English
  • black & white illustrations
  • 1236842286
  • 9781236842282