M. Hartley, W. Smith, J. F. Spears, L. Fisher, J. R. Schultheis
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EFFECT OF UNIFORMITY OF SEEDLING EMERGENCE ON THE PERCENTAGE OF USABLE TRANSPLANTS PRODUCED IN THE GREENHOUSE FLOAT SYSTEM
Abstract Experiments were conducted in 1999 and 2000 to investigate the effect of uniformity of seedling emergence on the percentage of usable tobacco transplants produced in a greenhouse float system. Uneven seedling emergence was facilitated by staggering seeding date in randomly selected cells within a 288-cell tray. Treatments included seeding all cells on day 1 (control) and seeding 75% of the cells on day 1 and 25% seeded on day 5, 7, or 12 (in 1999) and day 3 or 5 (in 2000); other staggered seeding combinations also were investigated. Seedling emergence was measured until maximum emergence was observed. Fifty days after initial seeding, total plant stand, number of usable transplants, stem length, fresh weight, and dry weight were determined. A sample of 10 seedlings, based upon the percentage of usable and non-usable transplants from an individual tray, was used to determine stem length, fresh weight, and dry weight measurements. In both years, delayed seeding resulted in slower and less uniform s...
期刊介绍：
Chinese Tobacco Science is an academic scientific journal (bimonthly) under the supervision of the Ministry of Agriculture and Rural Affairs of the People's Republic of China, and sponsored by the Tobacco Research Institute of the Chinese Academy of Agricultural Sciences and the Qingzhou Tobacco Research Institute of China National Tobacco Corporation. It was founded in 1979 and is publicly distributed nationwide. The journal mainly publishes academic papers on scientific research results, new production technologies, and modern management in my country's tobacco science research and tobacco production technology. In addition, it also publishes forward-looking review articles in the field of tobacco research. There are columns such as tobacco genetics and breeding, cultivation technology, modulation and processing, physiology and biochemistry, plant protection, review or monograph, quality chemistry, etc.
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