Effects Of Ecological Factors On Transplanting Stage And The Quality Of Tobacco Seedlings In Sangzhi Tobacco Growing Areas

In order to comprehensive evaluate the ecological conditions of Sangzhi tobacco area, we used the climate data in recent 30 years and 458 soil samples collected from 23 towns, and then through the different transplanting period and the tobacco seedling quality comparison test, effects of climatic factors on Yield and quality of flue cured tobacco were revealed.The results obtained are listed as followings.(1) There is a small temperature range in field growth period, the daily average temperature is 24.3?, the average daily temperature of the extension period was 20.8?,the vigorous growing period is 20.8?, the mature period was 20.8?;Uneven distribution of rainfall in field growth period,the daily average rainfall is 655.8 mm, the average daily rainfall of the extension period was 192.9 mm, the vigorous growing period was 342.3 mm, the mature period was 150.2 mm;The daily average sunshine hours was 490.7 h,?10? effective accumulated temperature was 2352.3 h, average air relative humidity was 79.9%. That less rainfall in vigorous growing period?more rainfall in mature period?low sunshine hours and?10? effective accumulated temperature in field growth period are the main climatic factors on the quality tobacco production in Sangzhi.(2) The organic matter and nutrient elements in the suitable content range were organic matter (26.89?40.43 g/kg)?Available phosphorus (11.6?14.9 mg/kg) available k (144.5?188.3 mg/kg)?Available B (0.35?0.49 mg/kg)?available Mo (0.13?0.26 mg/kg); But the content of alkali-hydrolyzable nitrogen (191.2 mg/kg) and available sulfur (25.7?36.3mg/kg) were too high.(3) Different transplanting date test results show that the four transplanting treatment in April 23, transplanting tobacco strains leaf area, plant height and pitch of the largest yield, production value, average price, first-class higher proportion of tobacco, upper leaves and the middle leaf total nitrogen content suitable. Other transplanting treatment nicotine content was high, potassium content was low. On the whole, the suitable transplanting period of the tobacco growing area was in mid-April to late period.(4) Different seedling quality test results show that the high quality of tobacco seedlings and low quality of tobacco seedlings compared to tobacco growth process inYunyan 87 and K326 tobacco strains plant height were increased by 7.67 cm and 25 cm, leaf area were increased by 138.29 cm~2 and 572.02 cm~2, stem girth were increased by 0.86 and 1.86 cm, the total number of leaves were increased the 1.01 and 2.70 tablets and chlorophyll were increased 0.47 and 1.57 mg/g,30 days after being transplanted proline content were increased 4.45 mg/100g and 5.23 mg/100g. Therefore, improving the quality of tobacco seedlings has a significant effect on the growth of tobacco plants in field.