The Influence On Growing Development And Yield And Quality Of Flue-cured Tobacco In Hunan Province With Sowing And Transplanting Period

Tobacco Sowing and Transplanting Period is one of the key links to get a good quality and high yield of tobacco leaf, and climate conditions is the main influence factors to select Sowing and Transplanting Period. The main purpose of this paper study is to choose the best Sowing and Transplanting.Period, and highlight the style characteristic of strong flavor flue-cured tobacco in hunan area.By analysis the influence to flue-cured tobacco growth, tobacco economic characters, chemical composition and other index with temperature, sunshine and rainfall,to find out its relevance, and provide reference for tobacco production research. The main conclusion of this study are as follows:1. Each processing growth period gradually shortened with the delay of transplanting, but transplanting April1or so will influence the growth period the transplant after tobacco crop. The influence of transplanting to flue-cured tobacco physiological and biochemical indexes reached a significant differences between treatment level. Except the effective leaf number, other agronomic characters are show the trend of first increases, then decreases with a delay of transplanting, transplanting on March20or so, comprehensive performance the best, transplanting April1or so, taking the second place. Timely early transplanting helped to lighten the climate spot and bacterial wilt harm, but helicoverpa assulta will serious harm with transplanting too early. Taken together, transplanting on March20or so stage transplanting makes the best effect.2. Tobacco leaves economic indexes such as yield per mu, average production value per mu, average price, the proportion of superior, the proportion above the medium,all showed the trends of first increases, then decreases with the delay of transplanting, and comprehensive performance T2>T1>T3>T4. namely transplanting on March20or so stage transplanting the most beneficial to improve the external economic characters, and improve the quality of tobacco leaves.3. The influence of Sowing and Transplanting Period to the chemical index of tobacco is extremely significant. Total sugar and the reducing sugar content with transplanting on March20or so the highest in general, transplanting April1or so minimum, showed the trends of first increases, then decreases. Nicotine and total nitrogen content with a delay of transplanting gradually increased. Liuyang sites, chlorine content in with a delay of all the transplant first increases, then decreases, and GuiYang sites have no obvious rules. Two sites starch content is higher than the national quality standard of flue-cured tobacco, and need improve cultivation and bake techniques to decrease starch content, carotenoids overall a gradually increasing trend with the transplanting of delay.4. Transplanting have great influence on the tobacco leaf length of leaves, leaf width, weight, balance moisture content, including infarction rate, leaf quality weight, leaf density, leaf thickness, open degree of physical indexes. Suitable Sowing and Transplanting Period in favour to improve the physical characteristics of the tobacco leaf index.