Studies On Effects Of Nitrogen Application Amount And Leaf Age To Flue-cured Tobacco Usability

Experiments were conducted on tobacco variety Yunyan85 to study effects of nitrogen's dosage and leaf's age on structures of fresh leaves, chemical components and economic properties. The purpose was to discuss the influence of usability of flue-cured tobacco and discover a rational combination which could enhance the quality and output. The result is as follows:The nitrogen level is higher, the blade thickness, Palisade tissue thickness and Spongy tissue thickness are thicker, otherwise is small; Along with mature period maturity degree of leaf's age increase, the blade thickness, Palisade tissue thickness and Spongy tissue thickness decrease; Postpones each processing maturity along with the harvest time to enhance, the leaf blade organizational structure is looser, is advantageous enhance the usability of flue-cured tobacco.Each processing besides the total sugar and reducing sugar content is high, other indicators were normal. In each processing, chemical composition content and coordination of the best was: purity nitrogen 9kg/666.7m~2 (6.5kg inorganic nitrogen +2.5kg organic nitrogen) lower, middle and upper leaf age of 50days, 65days, 75days harvesting.The best processing of the economic character synthesis was: purity nitrogen 9kg/666.7m~2 (6.5kg inorganic nitrogen +2.5kg organic nitrogen) lower, middle and upper leaf age of 50days, 65days, 75days harvesting.Comprehensive the performance of structure of leaf, chemical composition content and coordinative, economic character, the result was: Application purity nitrogen per 666.7m2 is hit by under 9kg/666.7m~2 (6.5kg inorganic nitrogens + 2.5kg organic nitrogens) ,lower, middle, upper leaf is that the combination that 50day, 65days, 75days spirits collect is optimum respectively; Besides, under the Application nitrogen is horizontal low situation, suitable appropriate shift to an earlier date gathering collecting, to gain higher usability flue-cured tobacco.