Development and Activities of Roots of Crop Plants; A Study in Crop Ecology

Development and Activities of Roots of Crop Plants; A Study in Crop Ecology

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ... was recorded for a few of the longest roots, while at 5.5 feet depth they were not at all uncommon. Thus, the root depth exceeded that at Lincoln (4.2 feet) and nearly equaled that at Peru (6.7 feet). The root extent was greater than that of Texas Red oats (4.8 feet) excavated a few miles distant, but in similar soil, in June 1919 (Weaver, 1920:119). The clue to this marked root development is apparently to be found in an examination of the texture and water-content of the soil and the aerial conditions causing water-loss. In general, the mellow soil during this interval was relatively dry when compared with conditions at Lincoln, while the evaporating power of the air was greater than at the latter station. This seems to have stimulated root-growth in the deeper soils where available water was present. Only 1.96 inches of rain fell during this period (June 10 to July 9), and about 20 per cent of this occurred in 9 light showers which had little or no appreciable effect upon water-content. An examination of table 13 reveals the scarcity of available moisture, which was entirely exhausted from the surface 6 inches of soil on July 1 and 9. Throughout the period the evaporating power of the air was relatively high, about 24 c. c. daily (table 14). The average daily air-temperature ranged from 64 to 76 F., maximum temperatures of 88 to 99 F. not being unusual. The soil-temperature at 6 inches depth varied from 65 to 77 F. (fig. 26). Fio. 26.--Average day and average night air-temperatures and average daily soil-temperature (broken line) at Phillipsburg, 1920. Barley, Hordeum Vulgare. On June 10, when the barley roots were first examined, the crop was in good condition and had an average height of about 10 inches. The parent plants had from 4 to 6...show more

Product details

  • Paperback | 48 pages
  • 189 x 246 x 3mm | 104g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236512987
  • 9781236512987