The Influence Of Sowing Time And The Substrate On Seedling Quality And Output And Quality Of Flue-Cured Tobacco

In order to reveal The sowing time and the Substrate for tobacco seedling quality, growth and quality of tobacco leaf production of tobacco plant, this study of over 87 seed as material, through the contrast test, study the sowing time and the Substrate conditions, the growth period of flue-cured tobacco seedling and field growth and the status of the production quality of tobacco plant, and analyzes the quality indexes of tobacco leaf. Received the following has theoretical and practical significance of the results of the study:1, The sowing time and the Substrate had a greater influence on the development of tobacco quality. The sowing time and the Substrate the germination rate and survival rate were significantly higher than that of CK6.4% above. Sowing time and the way process each organ significantly higher dry matter accumulation, leaf chlorophyll in, a high content of nitrate reductase, strong root activity. Under the same main processing, flower mud processing integrated performance is better than sand, under the same vice, January 15, sow good seeds on January 30.2, The sowing time and the Substrate on growth and physiological indexes of flue-cured tobacco were significant or extremely significant effect, and sowing time and the Substrate is conducive to the growth of flue-cured tobacco above ground. Compared with controls, the development of taproot, each process can shorten the flue-cured tobacco seedling stage 2-4 days, leaf chlorophyll, carotenoid content and root activity, nitrate reductase activity increased, is advantageous to the flue-cured tobacco field enhanced photosynthesis. But as sand substrate reduces the flue-cured tobacco root activity.3, The sowing time and the Substrate is beneficial to improve the yield and quality of tobacco leaves after baking. Compared with the control, The sowing time and the Substrate, respectively, to improve the processing, middle leaves one weighs 0.96 g-2.38 g,2.89-5.33 g; Improve the upper and middle leaves the total sugar content 1.30% 5.25%,1.55% and 4.64%, reducing sugar 3.95%,8.01%,2.84% and 7.06%. The sowing time and the Substrate effect on the nicotine content of upper leaves smaller, and the variation is not obvious, but the nicotine content in middle leaves increased by 0.14% to 0.14%. The sowing time and the Substrate effectively improves the potassium content in upper leaves, reduce the chlorine content. Compared the potassium content in upper leaves increased by 0.09%-0.29%, middle lobe increased by 0.08% to 0.08%. Chlorine content in the upper leaves was reduced by 0.07%-0.13%, middle lobe was reduced by 0.05%-0.14%. The sowing time and the Substrate in each processing production, output, proportion of superior tobacco is significantly higher than that of control, the yield increased 95.25 338.57 Kg/hm2, the proportion of superior tobacco increased by 5.02%-12.23%.4, Different sowing time on affected by the smoking quality of tobacco leaves. Compared with the control, the processing quality of different sowing time, aroma quantity is sufficient, good aroma sending, flue gas sink overflow, more smooth, soft and delicate, slightly green miscellaneous gas and wood gas, comprehensive performance were better than that of the control. Early sowing in time will help to improve the quality of sensory evaluation of tobacco leaf.