Bulletin of the U.S. Department of Agriculture Volume 591-610

Bulletin of the U.S. Department of Agriculture Volume 591-610

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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. 1917 edition. Excerpt: ... with lettuce drop. As a result, a great deal of lettuce has arrived on the market in unsound condition. OUTLINE OF EXPERIMENTS IN 1813-14. CAREFUL CUTTING. In order to determine the effect of greater care in preparing lettuce for shipment, various methods of cutting were tested in these investigations. It seemed evident from the start that the infection occurred mainly through the lower leaves, which rest on the ground. Therefore the lettuce was cut at a point just above these leaves. This method left the three or four under leaves untouched on the ground. If one or two of the leaves on the head showed signs of decay they were pulled off. If a large number of leaves were diseased or if the main stalk showed signs of disease, the head was discarded. Only lcttuce that appeared entirely free from disease was included in these carefully cut lots. Figure 4 is a fair representation of the appearance of the lettuce when cut by either method. The commercially cut lettuce is dirty and shows diseased areas on the lower leaves, Flo. 2.--A field of healthy lettuce, showing the condition of the plants at harvest time. whereas that carefully cut is clean, attractive, and free from disease. The carefully cut lettuce was packed in accordance with commercial methods, and a similar lot, cut and handled throughout commercially, was obtained from the same field at the same time for purposes of comparison. PRBCOOLINQ. The lots obtained each day were divided into two parts: Half of the carefully cut lettuce and half of that commercially cut were pre cooled, and comparable lots were placed under regular refrigeration. The precooling was done by means of the portable precooling plant of the Office of Horticultural and Pomological Investigations. This plant...show more

Product details

  • Paperback | 198 pages
  • 189 x 246 x 11mm | 363g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123694397X
  • 9781236943972