Analysis And Evaluation Of Tobacco Leaf Chemistry Component And Ecologicalconditions In Chongqing Tobacco-Growing Region

Using statistics of Chongqing flued-cured tobacco chemcical components, climate and soil , the climate feasibility, soil fertility and tobacco components were by the methods of variance analysis, correlation analysis, principal compopent analysis and fuzzy synthetic evaluation the main results were as follows:1 The chemcical components evaluation of flue-cured tobacco in different areas and in different leaf position of ChongqingThe statistical analysis and the comparision with superior tobacco-growing area of the regular chemical components indicated that the contents of total sugar and reducing sugar were in the optimum range;Chongqing flue-cured tobacco was in the optimum range and somewhat higher than Henan and Yunnan flue-cured tobacco on the contents of nicotine in cutters, the total nitrogen were in the optimum range; the contents of potassium and chlorine were both lower than the optimum range; the contents of potassium were low in all areas; the ratio of potassium to chlorine were high; the ratio of sugar to nicotine was adapt for acid-base balance; the ratio of total nitrogen to nicotine was in the optimum range. The variation between different areas was significant at 0.01 level for the content of nicotine and potassium. However, the variation was not significant at 0.05 level for the content of other chemical index.According to the fuzzy synthesis evaluation, the chemcical components evaluation of flue-cured tobacco in upper leaves in Chongqing is 0.48, the score of Nanchuan and Wushan is higher than others. The chemcical components evaluation of flue-cured tobacco in upper leaves in Chongqing is 0.518, the score of Pengshui Nanchuan and Wushan is higher than others.2 The soil feasibility evaluation of flue-cured tobacco in different areas of ChongqingAccording to the optimum range of superior tobacco-growing area analysis, the content of organic matter is high ; The pH value was base but in the optimum range; the content of total nitrogen was rich and available nitrogen was optimum; the content of potassium was rich and available potassium was suitable in 60% of soil ; the content of available calcium and available sulphur was higher, the content of magnesium was suitable in total; the content of available boron and available copper was obviously deficient in total; the content of available mangaese and zinc was lower in 60% of soil ; almostlly all the content of Fe was in the middle level ; the content of chlorine was no more than the standard level . Except for the variation was not significant at 0.05 level for the total phosphorus all the other soil index was significant at 0.01 level of the the variation which indicated that the properties of soil had distinct divergence between different areas. The relationships amony soil nutrients in tobacco-growing bases were analyzed with correlation analysis.The results indicated that the number of correlation coefficient at 0.05 level was 55, acounting for 40.4%. The number of correlation coefficient at 0.01 level was 43, acounting for 78.2%.The results showed that there were distinct nonlinear correlation among soil nutrients.Soil feasibility index in Chongqing is 0.684, the proportion at higher level was 70.7%, at medium level was 17.58% and at high level was 11.72%. No sample was at low level. The score of soil feasibility index of Pengshui and Wushan was higher than other areas.3 The climate feasibility evaluation of flue-cured tobacco in model areas of ChongqingThe statistical analysis and the comparision with superior tobacco-growing area in abroad indicated that yearly average temperature is 15.58℃, average temperature during field period was 23.48℃, which were higher than that of superior tobacco-growing area abroad. Total precipitation during field period is 552.36mm, which was somewhat lower than that of superior tobacco-growing area abroad. Rainfall distribution was lower in previous and latter period but higher in middle period. Annual total sunlight hours was 1097.12h, percentage of sunshine was 26.48%,total sunlight hours during field period was 434.63h, which were lower than superior tobacco-growing area in abroad. In general, the heat quantity condition and rainfall of Chongqing were rich and the distribution was adapt for request of water .However, sunlight was inadequate. According to the fuzzy synthetic evaluation, the integrated index of Qianjiang was 0.817(CV=8.77%), the climate feasibility was well, the variance was minor.