Yanbian Flue-Cured Tobacco Quality Characteristics And Relationship Between Rhizosphere Soil Environment And Flue-Cured Tobacco Quality

Field experiment had been carried out with Jiyan 9 cultivar in Yanbian area of Jilin Province, the quality characteristics of flue-cured tobacco and physical and chemical characteristics of rhzisphere soil were studied, and changes of main chemical components of flue-cured tobacco during its growing period and the corresponding changes of physical, chemical, enzyme and microbe of rhzisphere soil were dicussed, the correlationship of flue-cured tobacco quality indicator and rhzisphere soil quality indicator were anylyzed. The main results were as follows:1 Soluble sugar and reducing sugar content, ratio of soluble sugar to total nitrogen, and ratio of total nitrogen to nicotine were significantly higher than appropriate range, nicotine and total nitrogen content, special leaf weight and leaf thickness were lower, and sensory quality was that with poor flavor quality, odor quantity, insufficient strength, heavy irrition and inadequeate after-taste, but with good combustion.2Flue-cured quality was obviously different in different soil types, dark brown forest soil took the first place, black sand soil took second and planosol was the poorest.3Changs of soluble sugar, reducing sugar, total nitrogen, potassium and chlorine content were significantly different and change of nicotine content was complexed.4In a whole, nitrogen, phosphorus, and potassium supplying capacity were decreased with arable layer deepening, furthermore, potassium supplying capacity of dark brown forest soil was strongest, and black sand soil took second, and planosol was poorest.5Changes of bacteria, fungi, abiogenous azotobacter, potassium bacteria, phosphorus bacteria, ammonificator and biodiversity index were obvious different and greatly influenced. Furthermore, dark brown forest soil was suitable for the 6 kinds of bacteria above, change of biodiversity index was complex, fungi was less influenced by soil types, change range of fungi in planosol was obvious larger than dark brown forest soil and black sand soil.6Catalase hydrogen peroxide activity changed with a mono peak variation, the maximum values of which was different in soil types, the invertase and polyphenoloxidase activity were also different in soil types and polyphenoloxidase activity of dark brown forest soil and black sand soil were obviously higher than planosol during flue-cured tobacco growing period.7 Available nitrogen content could influence chlorine content, tensile tension and ensile strength, available phrophrus content could change total nitrogen and protein content, available potassium content could affect nicotine content, stem percentage, ordor, density, after-taste and ash, catalase hydrogen peroxide could influence aroma quantity, ordor, irritation, density, ash, combustion and sensory total score, biodiversity index could influence reducing sugar and chlorine content, tensile tension, ensile strength, leaf thickness, aroma quality, combustion, chlorophyll a, chlorophyll a and total chlorophyll content, carotenoid content, odor, irritation, density, after-taste, ash and sensory total score.