Effects of Wheat Straw Mulching Amount on Growth of Flue-cured Tobacco and Yield and Quality of Tobacco

Field experiment was conducted to study the effects of different mulching amount of wheat on agronomic characters of tobacco plant and the yield and quality of tobacco leaves.Result showed that mulching with wheat straw had little effect on early growth of tobacco plant,while the agronomic characters in treatment with 500 kilogram mulching per 667 squarer meter were significantly higher than other treatments.The chemical constituents and economic traits of tobacco leaves in treatments with 500 kilogram mulching per 667 squarer meter reached the best,the content of total sugar and reducing sugar in the upper leaves increased,the content of chlorine and improved potassium lorine in the upper and middle leaves decreased,the ratios of sugar and nicotine nearly reached 10 in upper and middle leaves,the ratio of nitrogen and nicotine reached 1 in lower leaves,the yield,output value,mean price,the first grade,the middle and first grade of tobacco leaves in the upland and paddy were 16.39%,31.81%,13.29,37.72%,12.69% and 15.75%,34.11%,15.88%,12.18%,8.80% higher than those of the contrast respectively.The treatments with with750 kilogram mulching per 667 squarer meter promoted the quality of tobacco leaves in lower position,and the ratio of sugar and nicotine relatively reached 10 in lower leaves.Overall,the treatments with with 500 kilogram mulching per 667 squarer meter promoted the growth of tobacco leaves and raised significantly the yield and quality of tobacco leaves.