| Flue-cured tobacco is an important cash crop in our country, and its yield and quality has direct influence on the economic performance of tobacco production. The potassium content of tobacco leaves is generally lower, which restricts the improvement of tobacco leave's quality and becomes an important factor that limiting the development of our tobacco enterprise. Therefore the question how to improve the potassium content of tobacco leaves has been paid attention to generally by the tobacco circle. At the same time, with the strong impact of the topic "smoking and health", the request of increasing security of tobacco and reducing the application of chemistry product becomes more and more intensively. The article is directed against the current situation of tobacco producing, proceeded with the appropriate control and adjust of Flue-cured tobacco's nutrient and metabolism, so we combined pot experiment and field trial in order to studied the effect and mechanism of Compound Bioorganic Fertilizer (CBF) on the growth, development, yield and quality, especially the potassium content of flue-cured tobacco. The main results of study are as followed:1.The application of CBF can significantly improve the potassium content of Flue-cured tobacco leaves. In the pot experiment, the potassium content was increased from 2.14 to 3.22 percents, and in the field trial the number is from 1.65 to 2.58 percents. Both reached the standard of high quality tobacco. The combining application of CBF and chemical fertilizer with rational ratio can prevent potassium content from descending rapidly in late growing stage, even make it rise continuously, which is the key reason for potassium content to improve. CBF can promote the tobacco`s potassium accumulation, coordinate the relationship between manufactory and depository, increase the ratio of potassium distribution in leaves in ripening stage and reduce the effusion of potassium from leaves.2.Notable effect of CBF on seedling raising of Flue-cured tobacco and growth of tobacco seedlings were found in experiment. The germination percentage can reach above 90% with the utilization of liquid biologic fertilizer, the seed vitality and the drought resistance and root activity of young sprout was improved remarkably too. CBF can accelerate the growth and development of seedlings and under two raising methods the time of seedling establishment was cutted by 2～3 days and 3～4 days respectively. Soaking seeds with liquid biologic fertilizer could enhance various characters of seedling and sprouts are orderly and strong. The recommend dilution ratio of liquid biologic fertilizer is about 30%.3.CBF can markedly promote the growth and development of Flue-cured tobacco plant. Appropriate combining application of CBF and chemical fertilizer could not improve the botanical characters of aerial parts, but also stimulate the growth of root system, increase the root activity and absorbency, especially in late growing stage, which is also beneficial to the rise of potassium content. Further more, the application could increase the chlorophyll content, strengthen the photosynthesis and accelerate the synthesis and accumulation of dry matter, which was improved by 16%. The proposed ratio of CBF out of total amount of fertilizer was 25%～50% .4.CBF can further the coordination and equilibrium of various nutrient elements and chemistry composition inside Flue-cured tobacco. Combining application of CBF and chemical fertilizer with proper ratio can improve the nitrogenous nutrition, balance the carbon-nitrogen metabolism, send more phosphorus and potassium to leave, better the harmony of the main chemistry composition such as nicotine, sugar and protein, advance the sensory evaluation indexes of tobacco leave such as aroma, aftertaste, vigor and so on.5.CBF can ameliorate the soil ecological environment, moderate the water, fertility, air and heat so improve the nutrition status of Flue-cured tobacco. The application of CBF could optimize the soil microflora, increase the pop...
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