Effects Of Different Organic Substance On Soil Enzymes Activity And Quality Of Flue-cured Tobacco

Pot experiment was conducted in this experiment by adding carbonsources to regulate soil C/N ratio to24, researching activity of key soil enzymes, thelaw of growth and development about flue-cured tobacco, mineral elements in curedtobacco leaf, general chemical composition, neutral aroma, organic acid content. Theresults showed that:1The results show that different carbon sources on soil enzyme activity: thetreatments which entire glucose, starch and cellulose into soil can promote soil ureaseactivity and the soil urease activity is maximum in the45or60days aftertransplanting. Effect of citric acid treatment on soil urease activity is little. In additionto the citric acid, the remaining carbon sources can promote soil sucrase activity, inwhich glucose is superior to starch and cellulose. Soil catalase activity of eachtreatment compared with the control in is promoting, and two peaks in45and75daysafter transplanting appeared. Each treatment all improved the soil cellulase activity,in which glucose is superior to other carbon sources for the improvement of soilcellulase activity. there are two peaks in the30and60days after transplanting.2Different carbon sources have a significant impact on plant height and maximumleaf area of flue-cured tobacco at different growth stages. In the beginning oftransplanting, The processing of glucose in the soil for the role of plant height issuperior to other carbon sources. Late in the flue-cured tobacco growth, the role ofstarch, cellulose and citric acid is to show, in which cellulose is the most significant.Compared with the control each treatment can promote largest leaf ares of flue-curedtobacco in the all growth period. Better than the other three carbon sources, glucoseincreases leaf area in the beginning of growth. From45days after transplanting, theeffect of starch, citric acid and cellulose is appeared and Impact of starch on themaximum leaf area is better than citric acid and cellulose.3The impact of dry matter accumulation in flue-cured tobacco is big.Comparedwith the control carbon source material can make dry weight of root, dry weight ofstem, dry weight of leaf have improved to varying degrees in growth period. In thebeginning of tobacco growth, glucose for the root, stem, leaf dry matter accumulation is obvious. But in the late growth stage of tobacco, the cellulose in the dry matteraccumulation of flue-cured tobacco roots and stems better than other carbon sources,while the starch on dry matter accumulation is superior to other carbon sources.4Different carbon sources added in the soil on the mineral element content in theupper, middle and lower parts of the cured tobacco is different. Each treatment canreduce the nitrogen content in the middle leaves cured, and citric acid treatment mayreduce the three parts of the leaves in the nitrogen content. Processing allowsphosphorus content baked tobacco leaf decreased in varying degrees, in whichglucose handled the phosphorus content decreased maximum in the upper leaves andlower leaves. Compared to the control, each treatment can Improve the Flue-curedtobacco leaf position in the potassium content, reduce the chloride ion content, andincrease potassium chlorine ratio, in which gellulose is best.5The impact of different carbon sources on the quality indicators of cured tobaccois different. Adding carbon source material in the soil can effectively improve thecontent of tobacco leaf soluble sugar and reducing sugar, and the role of citric acid onthe upper leaf, glucose on the middle leaves, starch on the lower leaves are better thanother carbon sources.Various carbon sources can significantly reduce the starchcontent of flue-cured tobacco leaf position, and cellulose is the best, followed bycitric acid. Different carbon sources reduce the nicotine content in the flue-curedtobacco of each leaf position and improve the sugar to nicotine ratio. Which the starchon the alkali content in the flue-cured tobacco of each leaf position decreased,cellulose reduce the effect of central leaf nicotine content.6Also quite different in the different carbon sources on neutral aroma of curedtobacco is obvious. Each treatment can improve the brown product of class materialcontent of the upper leaves and lower leaves of the brown product of class materialcontent, but citric acid and cellulose processing reduces the content of the productclass of brown in the middle leaves. The citric acid treatment reduce the materialcontent of the flue-cured tobacco leaves on central phenylalanine class, othertreatments compared with the control improve the content of phenylalaninesubstances. Citric acid treatment can improve the material content of the classcypresss-like alkanes in the upper leaves and middle leaves, and is superior to othercarbon sources. Cellulose processing can improve the central and upper leafcarotenoids material content, and superior to other carbon sources.7Effect of the organic acid content by different carbon sources show that: Each treatment compared with the control improve the upper leaves of tobacco non-volatileorganic acids and organic acids in the. Glucose and citric acid treatment improves theupper leaves senior saturated fatty acids, while reducing unsaturated fatty acids. Theeffects of organic acids in flue-cured tobacco leaves in central basically consistentwith the upper leaf phase.All treatments increased the total content of organic acids,each handling the lower part of tobacco senior saturated fatty acids and unsaturatedfatty acids content are decreased in varying degrees.