• Journal of the Korean Society of Tobacco Science
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• v.8 no.1
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• pp.57-67
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• 1986

This study was conducted to find out the effects of chlorine on the yield, chemical constituents and physical properties of Burley leaf tobacco. The results obtained are as follows. 1. There was no significant differences in growth and yield among chlorine application levels. 2. When chlorine being applied 4kg/10a or more, the cured leaf showed higher chlorine content and lower leaf quality remarkably. It was estimated that the critical application of chlorine was 3kg/10a. 3. Total nitrogen and alkaloid contents of cured leaf were increased by chlorine application, while the phosphorus, calcium and magnesium were not affected. 4. The reflectance color of red and yellow were decreased by cvhlorine application in cured leaf of field grown tobacco.

• Journal of the Korean Society of Tobacco Science
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• v.10 no.2
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• pp.99-107
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• 1988

Pot experiment was conducted to find out the effect of lime application on yield and chemical composition of burley tobacco in 1986, Lime increased exchangeable calcium and pH of soil, but decreased Al, Fe and Mn concentrations. Yield was increased by lime application, however lime could not be caused to yield increasing in the soil with high calcium contents. Cored leaves of limed Plot contained higher Mg. K, total nitrogen, NO3-nitrogen, water soluble and insoluble ash, alkalinity number of water soluble and insoluble ash, citric and malic acid, but lower Fe, Mn, protein-nitrogen, NH3-nitrogen, nicotine petroleum ether extract, palmitic and linolenic acid concentrations than those of unlined plot. The linoleic acid and volatile neutral constituents of cured leaves were not affected by liming. Lime increased yield, however it did not affect leaf duality in respect to chemical characteristics, suggesting that liming should be necessary for tobacco cultivation.

• Journal of the Korean Society of Tobacco Science
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• v.22 no.1
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• pp.19-24
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• 2000

To obtain the genetic information about DVT( $\alpha$- and $\beta$-4,8,13- duvatriene-1,3-diols) and cis-abienol contents, two burley(Burley 21, KB 108), three sun-cured cultivars(N. tabacum L. cv. Yonbyun 3, Jahengyon and Jaraehong), TI 1068, and thirty F$_1$ hybrids derived from them were sampled and the diterpenes were analysed using thin layer chromatography (TLC) procedures. DVT exudation from the leaf scerface could Ie detected in all coltivars and F$_1$ hybrids tested. TI 1068 and Yonbyun 3 had cis-abienol exdudates. Burley 21, KB 108, Jaheungyon, and Jaraehong had no spot of cis-abienol. It is considered that cis-abienol exdudation might be controlled by dominant gene(s). The cytoplasmic effect on the cis-abienol exdudation was not detected.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.39 no.6
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• pp.602-606
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• 1994

The study was conducted to investigate the relationships between the value of fresh leaf lengh ${\times}$ width and actual fresh or cured leaf area, Cured leaf weight of cutter and leaf in Burley tobacco plants. In all tested varieties, Actual fresh leaf area or cured leaf area, cured leaf weight was high significantly correlated with the value of fresh leaf length ${\times}$ width. The linear regression equation between them could be exploited for rapid and easy estimation of either fresh or cured leaf area, cured leaf weight. Highly significant correlation between fresh leaf area and cured leaf area or cured leaf weight was confirmed and a linear regression equation was also obtained for easy estimation of cured leaf area or cured leaf weight.

• Journal of the Korean Society of Tobacco Science
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• v.32 no.2
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• pp.77-87
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• 2010

Traditional simultaneous distillation extraction(SDE) and solid-phase micro extraction(SPME) methods using GC/MS were compared for their effectiveness in the extraction of volatile flavor compounds from different tobacco leaves types(flue-cured, burley, oriental). The major volatile flavor compounds of flue-cured and burley tobacco were similar such as neophytadiene, solanone, megastigmatrienone isomers, ${\beta}$-damascenone and ${\beta}$-ionone. On the other hand, volatile flavor compounds such as norambreinolide, sclareolide were specifically identified in oriental tobacco. Each method was used to evaluate the responses of some analytes from real samples and standards in order to provide sensitivity comparisons between two techniques. Among three types of SPME fibers such as PDMS(Polydimethylsiloxane), PA(Polyacrylate) and PDMS/DVB (Polydimethylsiloxane/Divinylbenzene) which were investigated to determine the selectivity and adsorption efficiency, PDMS/DVB fiber was selected for the extractions of the volatile flavor compounds due to its effectiveness. The qualitative analysis showed that the total amount of volatile flavor compounds in SDE method(130 species) was much more than that in SPME method(85 species). SPME method was more efficient for all the highly volatile compounds than SDE method, but on the other hand, low-volatile compounds such as fatty acids or high-molecular hydrocabons were detected in SDE method. SPME method based on a short-time sampling can be adjusted to favor a selected group compounds in tobacco. Furthermore this results could be used to estimate the aroma characteristics of cigarette blending by using a different type of tobacco with more effectiveness and convenience.

• Journal of the Korean Society of Tobacco Science
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• v.26 no.1
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• pp.43-49
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• 2004

This study was carried out to investigate moisture sorption and desorption characteristics followed by tobacco type. Experiments were performed at various temperature(5, 15, 25, 40 $^{\circ}C$) and relative humidity range (11～84 %) controlled by saturated salt solution. Regression equation was obtained to predict equilibrium moisture according to various relative humidity, temperature and tobacco types. The obtained regression equation showed high $R^2$(above 0.95) and predicted accurate equilibrium moisture. Equilibrium moisture contents declines in the following order when a relative humidity is 50 % or above: expanded stem, flue-cured, expanded tobacco, reconstituted tobacco, USA flue-cured, orient, burley. To maintain 13 % moisture of each tobacco type in the range of 5～40 $^{\circ}C$ it is recommendable to control relative humidity 49～56 % for expanded stem, 50～57 % for flue-cured, 54～61 % for USA flue-cured, 56～60 % for reconstituted tobacco, 57～62 % for expanded tobacco, 58～64 % for orient and 58～65 % for burley, respectively. It means that the relative humidity of each tobacco type should be differently controlled to maintain the same moisture under the same temperature. In the range of 5～25 $^{\circ}C$, the lower temperature showed the higher equilibrium moisture content.

• Journal of the Korean Society of Tobacco Science
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• v.21 no.2
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• pp.128-135
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• 1999

This study was conducted to determine the sidestream smoke concentration, nicotine, tar, and CO, by the characteristics of tobacco leaves and their combinations. 20 kinds of tobacco leaves and 15 types of their combinations were selected for this study. After collecting the sidestream smoke by fishtail chimney, the concentrations of nicotine, tar, and CO in sidestream smoke were analyzed. Variation in nicotine concentration of sidestream smoke among tobacco leaves and their combinations was as much as 9-times. Heavy leaves and burley leaves were higher in nicotine concentration than light leaves and flue-cured leaves, respectively, the reconstituted tobacco leaf had the minimum concentration of nicotine. Tar concentration of sidestream smoke also was changed by the characteristics of tobacco leaves and their combinations. As the american C4F had the maximum concentration of tar in sidestream smoke, the reconstituted tobacco leaf showed the minimum concentration. Blending 50 % flue-cured B1-0 plus 50% burley B1-T grade showed the highest value in the nicotine concentration. Also, in case of adding B3K and izmir tobacco leaves, the nicotine concentration was decreased. The tar concentration in the sidestream smoke increased as increasing the amount of flue-cured heavy leaf. The CO concentration was not so much Changed by the characteristics of tobacco leaves and their combinations.

• Journal of the Korean Society of Tobacco Science
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• v.10 no.1
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• pp.3-9
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• 1988

Effect of several nitrogen fertilizer sources on the chlorine absorption by the burley tobacco plants was investigated under the field and pot condition. The nitrogen sources included compound fertilize.(containing 3.9% NH4-N and 6.1% NH2-N), (NH4)2SO4, NaNO3. (NH2)2CO and NH4NO3. The chlorine content of leaf during growing stage was high in (NH4)2SO4 plot , and the differences among nitrogen sources was remarkable at maximum growing stage. The chlorine content of cured leaf was high in (NH4)2SO4 plot. When the (NH4)2SO4 was applied, the total alkaloid content of cured leaf was increased and the color of cured leaf became undesirable with the increment of leaf chlorine. The yield, quality and value of cured leaf were high in NaNO3 plot , while low in (NH4)2SO4 plot.

• Journal of the Korean Society of Tobacco Science
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• v.11 no.1
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• pp.19-25
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• 1989

Effect of removal time of mulched polyethylene film on the chlorine content of toP soil and on the chlorine absorption by burley tobacco Plants was investigated under the field condition in 1986 and 1987. Treatment consisted of 4 removal times (from 30 to 75 days after transplanting with IS days interval) and control (no removal). The chlorine content of top Boll at 15 days after removal of mulched polyethylene film(MPF) lowered temporarily, and the decrement of chlorine content of top soil was closely related to the sum of rainfalls after removal of MPF. The chlorine was accumulated much in upper leaves when the MPF being removed early, while the chlorine was accumulated much in lower loaves when the MPF being removed late, relatively. However, the removal of MPF had no effect on the chlorine content of whole leaf. The yield decreased with removal of MPF during growing period.

• Journal of the Korean Society of Tobacco Science
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• v.24 no.1
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• pp.32-37
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• 2002

This study was carried out to investigate the effects of suckers on chemical components with vertical and horizontal hanging method during stalk-cut curing in burley tobacco. The elongation and dry weights of suckers were increased until 14 days in vertical hanging method, and until 7days in horizontal hanging method after the beginning of curing. The contents of nicotine, protein-N and $NH_4$-N were decreased at treatment of more suckers during the curing. However, there was no significant difference by the hanging method. Solanone, damascenone, megastigmatrienone and 4-methyl phenol were increased gradually during curing. Those were increased with treatment of fewer suckers compared to treatment of more suckers. There was no significant difference by the hanging method.