Effects Of Different Coverage On YANSHAN County Tobacco Growth And Quality Characteristics

To explore the Yanshan county flue-cured tobacco production in reasonable coverage, Yunyan 87 as test materials by randomized block design of 6 kinds of coverage (uncovered cultivation, the straw covered, film, pre coated, after film straw, straw mulched double cover) on the flue-cured tobacco growth, yield and quality, the main conclusions are as follows:1.Effects of different coverage on the growth and development of flue cured tobaccoThe coverage can significantly affected the growth and growth stage of the flue-cured tobacco. In addition to the field growth period of treatment " whole period covered" and "bare land cultivation" consistent, growing period in the field covered by other processing have different degrees of delayed."The straw covered" and "after film straw"treatment delayed 6 days. Double film mulching straw cover treatment for tobacco plant growth promoting effect always is the most obvious, the leaf number were was significantly higher than that in bare land cultivation treatment, the various parts of the SPAD was the highest, the weight was the largest,reached 379.8 g at 80 day's.2.Effects of different coverage on the disease incidence of flue cured tobaccoCoverage has certain effect on the prevention and control of tobacco mosaic virus, bacterial wilt. Mulching treatment of tobacco mosaic disease incidence and disease index of were less than that of bare soil cultivation, the double film mulching straw cover treatment of tobacco mosaic disease incidence and disease index in the incidence of early, middle and late were maintained at a low level, at the onset, the latter part of the the prevention and control of tobacco mosaic virus and disease index were significantly lower than other treatments,At the later stage,the relative effect of the two disease was reached 54.21,38.59%.3.Effects of different coverage on the quality and yield of flue cured tobaccoIn terms of yield, covering production was higher than that of bare land cultivation,and "plastic straw double cover" treatment was the weightest,reached 2122.3 kg/hm~2. In terms of quality, "Double increase compared to bare land and cultivation, covering treatments can reduce the middle leaf starch content increased in all parts of the tobacco total sugar and reducing sugar content, in addition to" the straw covered "processing of various parts of the total nitrogen and nicotine content decreased slightly, and other various covering the various parts of the total nitrogen and nicotine content in varying degrees, straw mulching in different parts of tobacco potassium content were significantly increased, in terms of middle leaf, the "plastic straw double cover" treatment's potassium content was the highest reached 2.05%,this treatment's middle and upper leaf chemistry coordination of comprehensive score was the highest, appearance quality was the best.