Research Bulletin Volume 30-51

Research Bulletin Volume 30-51

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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. 1914 edition. Excerpt: ... considered relatively low. Corn, oats, rye, wheat and millet belong in this class. A calcium oxide content of somewhat more than 1 per cent may be considered relatively high. Peas, clover, alfalfa, buckwheat and most of the species of the cruciferae belong in this class." _ In 1914, Chirikov27 published a very important report, the conclusions of which confirm the views expressed by the writer in 1912, regarding the balanced nature of the solubility reactions in the solution surrounding the plant roots. With this principle as a basis, Chirikov states that the power of a plant to utilize the phosphorus of phosphorite depends upon the ratio of the plant's content of calcium oxide to phosphoric anhydride. He states that in case this ratio is greater than three, marked utilization of the phosphorite takes place, and in case it is less the utilization is much lower. As indicated by Chirikov there are a considerable number of exceptions to this rule. These, he stated, need further investigation. As already indicated, the writer believes that the calcium oxide content of the plant and not the ratio to phosphoric anhydride is the more important thing to consider. A full discussion of this question is given in the latter part of the present report. EXPERIMENTS ON THE UTILIZATION OF DIFFERENT PHOSPHATES Subsequent to the results of experiments reported in Research Bulletin 20 of this Station on the "Factors Influencing the Availability of Rock Phosphate," extensive pot culture investigations were started to test the availability to " Science 41 (1915) 616. 11 Russ. Jour. Exp. Landw. 15 (1914) 54. various agricultural crops of the different phosphates that probably exist in soils, as indicated on page 2. These...show more

Product details

  • Paperback | 258 pages
  • 189 x 246 x 14mm | 467g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123679141X
  • 9781236791412