Botanical Gazette Volume 46

Botanical Gazette Volume 46

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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. 1908 edition. Excerpt: ...the preparation of heterotypic chromosomes. In conclusion, he emphasizes synapsis as a fundamental stage, which constitutes a primary state of heterotypic prophase and not as an abortive kinesis.--Shigeo Yamanouchi. Soil fertility.--The Bureau of Soils is doing an excellent work in seeking the explanation of the differences in productiveness of soils along the lines of a rational physiology. In spite of various attacks upon the principles which they are developing, the work commends itself to the unprejudiced as consonant with the modern phases of physics and physiology. Two recent bulletins contain valuable reports of research. Cameron and Gallagher have shown that when water has been added to a given soil in such proportion that it is in its most favorable condition for working and for plant development (as determined by expert gardeners), this is also the condition when to a pointed instrument it is physically most penetrable. This "optimum" water content varies with different soils from 4 per cent. (sandy) to 120 per cent. (muck). The apparent specific gravity or volume, the rate of evaporation, and some other physical features are also definitely related to the moisture content, changing in a marked way as the optimum water content is passed. It is also shown that the optimum moisture does not vary with the plant, but what is best for one plant is best for another in a given soil. Probably the penetrability of the soil is the important factor, since roots are thus able to reach their maximum development, and so to offer the largest possible surface for the admission of water. Another bulletin, by Gardner, s reports a vast number of experiments on 4 Cameron, F. K., and Gallagher, F. E., Moisture content and physical more

Product details

  • Paperback | 178 pages
  • 189 x 246 x 10mm | 327g
  • United States
  • English
  • black & white illustrations
  • 1236872940
  • 9781236872944