A Study of Certain Environmental Factors and Varietal Differences Influencing the Fruiting of Cotton

A Study of Certain Environmental Factors and Varietal Differences Influencing the Fruiting of Cotton

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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. 1918 edition. Excerpt: ...period curve and the temperature curve are, to say the least, very significantt. This lengthening of the boll period through autumn prevents the obtaining of daily or weekly shedding data by the rather simple subtraction method (taking the difierence between flowering and bolls maturing) employed in Egypt by Balls (2). The time relationship of such data in this country would be distorted unless correction could be made for this seasonal variation in length of boll period. Apparently no such lengthening of the boll period occurs in the tropical climates of Egypt and the West Indies. Balls, however, speaks of environmental influences on the boll period, and states that this period is eight days longer in the middle Delta than at Cairo. The slower development of the late bolls undoubtedly renders them more liable to boll weevil attack than earlier bolls with the same rate of infestation, because it necessarily takes the late bolls longer to reach a stage where they are hard enough and thick enough to prevent their being injured. The record of daily mean temperature was supplied by the U. S. Weather Bureau. A continuous record of the daily temperature was not available, and the daily means have been obtained by averaging the maximum and the minimum of each date. The maxima for July 19 to 23 inclusive were lacking from Agricultural College and were supplied from records at Aberdeen, which is not far distant. 'yThe drop in the boll period to be noted in the case of bolls developing after August 29 is due to the killing frost which occurred November 3. The effect of frost is to cause premature opening of the bolls approaching ma.turity. The character of the soil, as well as the meteorological conditions, appears to affect the length of boll...show more

Product details

  • Paperback | 34 pages
  • 189 x 246 x 2mm | 82g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236548620
  • 9781236548627