Study On The Different Soil Micro-ecological Environment And Its Effects On Tobacco Quality In Yanbian

This paper investigated the relationship between three soil types (dark brown forest soil, black sand soil ,planosol) and tobacco leaf, with Jiyan 9 as research object, in Yanbian, Jilin Province from 2009 to 2011. The research contains: (1) the dynamic changes of microorganisms in soil, enzyme activities in soil, and physiological active indicators of root system with the growth of tobacco; (2) the quality of soil type on the impact of tobacco. Based on the research results, we want to improve soil quality so as to enhance the quality of tobacco leaf. Contents are as follows:1. Soil bulk density, moisture content, organic matter content, available P, and available K of dark brown forest soil were higher than these of the other two soil types. The trend of available N, P and K in three soil types was closely related with the growth of tobacco plant. Higher contents of available P and K in dark brown forest soil could supply more nutrition to tobacco plant.2. The trends of the contents of Ba, K, and Si in three soil types were very complex; otherwise, the trends of the contents of Ca, Mg, Mn, and P were consistent. Overall, dark brown forest soil could provide timely and adequate mineral nutrition to tobacco plant.3. The activities of PPO and CAT in dark brown forest soil were higher than these of two other soil types in the whole measured period. The activity of urease in dark brown forest soil was higher than that of two other soil types in the first 20 days, but with no difference in the following measured time.4. The trends of bacteria, actinomycetes, fungi, and potassium bacteria were different in three soil types. Dark brown forest soil was more appropriate for this 4 bacterias, followed by planosol and black sand soil successively. Planosol was more appropriate for phosphorus bacteria and abiogenous azotobacter, followed by black sand soil and dark brown forest soil successively.5. Tobacco plant grow well in dark brown forest soil and the cured tobacco's physical properties was good. Total sugar and reducing sugar contents in tobacco leaf were high of these three soil types; otherwise, nicotine content was the opposite. Overall, the chemical compositions in tobacco leaf were optimal of dark brown forest soil.6. The contents of neutral aroma were highest in dark brown forest soil, followed by black sand soil and planosol. Especially, phenylalanines, browning reaction producets, cembranenoids, and carotenoids contents in tobacco leaf could be improved in dark brown forest soil.