Biology Pamphlets Volume 1540

Biology Pamphlets Volume 1540

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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. 1921 edition. Excerpt: ...At-5C. It is seen that the amount of freezable w;iter is somewhat greater in the morning than in early afternoon, but the differences are not as great as those found by McCool and Millar. The moisture content is also somewhat less in the afternoon indicating the possibility of a greater power of imbibition at that time. Probably the larger factor in causing the slight difference in amount of frozen water is the increased concentration of sugars formed by the photosynthetic activities of the leaf. Both the moisture content and the concentration of cell sap evidently have some influence on the amount of freezable water. Effect of watering plants with salt solutions on amount of easily frozen water in the leaves.--A method used to harden vegetable plants was watering with salt solutions. Only one of these experiments will be discussed here. On February 15, seedling cabbage plants were potted in 3-inch clay pots, which were plunged in soil on a raised bench in the greenhouse. One series was potted in river sand, one in greenhouse compost soil and a third in compost plus rotten stable manure. Each series was divided into four plots and after the plants were well established one of eacli series was watered with: (1) tap water, (2) M/10 NaN08, (3) M/10 KC1, (4) M/10 XaCl. These applications were repeated every few days, when water appeared to be required. After the second application, the rate of growth in the different plots was evidently being affected. All of the salt solutions depressed growth but particularly in the series grown in compost and in the compost and manure mixture. Plants growing in the sand showed some of this stunting effect, but much later than in compost soils. A test made March 30 showed that the plants grown in the compost soils...
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Product details

  • Paperback | 32 pages
  • 189 x 246 x 2mm | 77g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236493656
  • 9781236493651