• Journal of the Korean Society of Tobacco Science
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• v.5 no.1
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• pp.87-95
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• 1983

This study was conducted to evaluate the affect of soil conditioners and their application rates on the growth, Yield and quality of Flue-cured tobacco. Soil conditioners for this study were Montmorillonite arid Zeolite as clay mineral source and Rice hull and Sawdust as organic source. Their application rates were 500, 1000, 2000kg/10a. The growth of tobacco plants was promoted, compared with that of Non- treated plot (control) by Zeolite, Montmorillonite and Rice hull application but decreased by Sawdust application. During tobacco growing season soil moisture content, compared with control, was increased by Zeolite and Montmorillonite application but decreased by Rice hull and Sawdust application. In contrast to soil moisture content, soil temperature was higher in the Rice hull and Sawdust plot than in the plot of Zeolite and Montmorillonite. The treatment of Sawdust, compared with control, obviously accelerated the maturity of tobacco, increased reducing Sugar but decreased total alkaloids, nicotine and nitrogen content of cured leaves. The Sawdust Plot decreased the Yield (kg/10a) with significant difference by 1 %level but significantly increased leaf quality (Won/kg) and value (Won/10a) by 1%and 5 %level, respectively. The present application , ate of Nitrogen in Korea (12.5kg/10a) seems to be excessive for Flue-cured tobacco production.

• Journal of the Korean Society of Tobacco Science
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• v.13 no.2
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• pp.5-20
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• 1991

For the quality enhancement of harvested-year leaf tobacco to the quality of 2-year naturally aged leaf tobacco, cellulose and nicotine degradative bacteria were isolated and identified. Effects of artificial fermentation treated cellulase and nicotine degradative bacteria on the quality of leaf tobacco were investigated from the chemical and sensory points of view. 1, Changes in chemical composition of leaf tobacco resulted from the addition of cellulase extracted from Cellulomonas sp. [3ml(${\mu}{\textrm}{m}$ D-glucose/ml. mil-1) of enzymes solution 11009 of leaf tobacco] and nicotine degradative bacteria, Pseudomonas sp. 2ml(IX109 cells$\div$ 100g of leaf tobacco), and subsequently fermented at 40${\mu}{\textrm}{m}$$^{\circ}C$, 65% R. H. for 40 days are as follows : 1) Content of crude fiber decreased 12% It took 9 min, 53 sec. to reach full combustion in control group but took only 7 min. 47 sec. in the treated group, taking almost equal time to 2-year naturally aged leaf tobacco(7 min. 35sec.). 2) Light intensity of control group was 60.96% with bright lemon color but that of treated leaf tobacco accounted for 47.69 with orange to dark brown color series, which was almost equal to the value, 45.69, of 2-year naturally aged leaf tobacco. 3) Linoleic acid, serving mild taste among organic acids, amounted to 1.llmg/g in control group but increased to 1.35m9/9 in the treated leaf tobacco, identical to the content(1.35mg/g) of 2-year naturally aged leaf tobacco. 4) Content of solanone, on of the typical leaf tobacco flavor compounds, accounted for 2.95% in control group but increased to 2.87% in treated group. 5) Methyl furan, useful flavor compound in smoke composition, accounted for 17.6$\mu\textrm{g}$/cig. in control group but increased to 25.9$\mu\textrm{g}$/cig. in treated group. However, acroleine decreased from 69.3$\mu\textrm{g}$/cig. in control group to 58.6$\mu\textrm{g}$/cig. in treated group 2. In sonsory test, mild taste evaluation of control group scored 5.47 and treated group 7.93 which was evaluted almost equal to the value(8.00) of 2-year naturally aged leaf tobacco. Aroma evaluation of control group scored 5.60, treated group 8.20, and 2-year naturally aged leaf tobacco 8.33. In addition, total harmony taste of control group showed 5.67, treated group 8.07 (p<0.01), and 2-year naturally aged leaf tobacco 8.00. From these results, it can be said that quality of treated leaf tobacco is not inferior to that 2-year naturally aged leaf tobacco.

• Journal of the Korean Society of Tobacco Science
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• v.5 no.2
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• pp.3-7
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• 1983

Three levels of nitrogen, phosphate and potassium were applied to tobacco for the establishment of the optimum rate of the fertilizers for yield and quality. 1 . The rate increment of nitrogen and potassium increased tobacco growth, but phosphate were non - significant between rate. 2. The contents of total-nitrogen and total-alkaloid in the leaf were increased, with the increase of nitrogen rate while the effect of phosphate and potassium were negligible. 3. The yield and quality of the tobacco were increased with the increasing rate of nitrogen and potassium fertilizer but phosphate should little difference.

• Journal of the Korean Society of Tobacco Science
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• v.25 no.1
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• pp.34-38
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• 2003

This study was carried out to investigate the changes of dehydration process and quality of cured leaves with crushed midribs and cut of the yellowed leaves during drying stage of flue-cured tobacco. The crushed midribs of yellowed leaf dried out before raising the highest temperature of midrib drying stage and reduced the curing time by about 20 hours. However, the cut of yellowed leaf was not affected the curing time and dehydration process during drying stage of flue-curing due to a problem with the cut leaves packing excessively in the curing container. The cured weight yield was increased with crushed midrib and cut leaves, and nicotine and sugar contents of cured leaves and quality in terms of dollars per kilogram were decreased with crushed midrib and cut leaves.

• Journal of the Korean Society of Tobacco Science
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• v.6 no.1
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• pp.63-72
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• 1984

1 . Some components associated with mildness, taste, and aroma were set. It was supposed that the three factors contribute to equally the evaluation of tobacco quality. Following equation of quality index was provide. $Q_{pr}\;=\;=0.815\;f_1+8.224f_2+1.858f_3$ where $f_1$ = Reducing sugar (%)/cellulose (%) $f_2=\frac{1}{Total N (%) + Protein (%) + Citric acid (%)}$ $f_3$=Key aromatic compounds ($mg/10g$) 2. The coefficient of correlation between the grades by visible criteria and the values of the quality index for Korean flue-cured tobacco was $\tau$=-0.689 (n=29)

• KOREAN JOURNAL OF CROP SCIENCE
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• v.40 no.1
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• pp.120-124
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• 1995

The study was conducted to investigate the relationships between tobacco leaf pro-duction rate by quality grade and the value of climatic factors in tobacco growing season. In flue cured tobacco（NC82）, high quality was positively corretated with precipitation in late April and May, with sunshine' hours in early May and late June, with average temperature in middle July, significanly. In Burley tobacco（Br21）, high quality was positively correlated with precipitation in late April and May, with sunshine hours in early May and early July, with average temperature in middle July, significantly.

• Journal of the Korean Society of Tobacco Science
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• v.30 no.1
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• pp.39-49
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• 2008

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2000.11c
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• pp.569-577
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• 2000

The position of tobacco leaves is affluence to the quality. To evaluate its quality, sample leaves was collected according to the position of attachment. In Korea, the position was divided into four classes such as high, middle, low and inside positioned leaves. Until now, the grade of standard sample was determined by human expert from korea ginseng and tobacco company. Many research were done by the chemical and spectrum analysis using NIR and computer vision. The grade of tobacco leaves mainly classified into 5 grades according to the attached position and its chemical composition. In high and low positioned leaves shows a low level grade under grade 3. Generally, inside and medium positioned leaf has a high level grade. This is the basic research to develop a real time tobacco leaves grading system combined with portable NIR spectrum analysis system. However, this research just deals with position recognition and grading using the color machine vision. The RGB color information was converted to HSI image format and the sample was all investigated using the bundle of tobacco leaves. Quality grade and position recognition was performed through well known general error back propagation neural network. Finally, the relationship about attached leaf position and its grade was analyzed.

• Journal of the Korean Society of Tobacco Science
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• v.1 no.1
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• pp.63-70
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• 1979

In order to improve the quality of greenish tobacco leaves, fermentation experiments by microbial treatment and periodical variations of fermentation temperature were performed. More than twenty strains were isolated from Hyangcho ( Sun cured Korean native leaves ) and Perique tobacco leaves. Among them, five strains which showed good growth in Nicotine Broth medium were selected. Identification experiments of these strains as well as checking the effects of fermentation by these treatment on the quality and aging rate of greenish tobacco leaves were carried out. The results were like following ; 1. Selected strains were identified as pseudomona.f for H-82, for P-4 and Bacillus for H-81. p- 4 and P-7. 2. Among the five strains, strain H- 82 showed the best effect on the forced aging and the quality of greenish tobacco leaves, The rate of oxygen uptaking, pH and nicotine contents were decreased. However, total volatile acids and petroleum ether extracts were increased. 3. After fermentation, taste from greenish tobacco leaf were removed and smoking characteristics were improved. Color was also changed from greenish yellow to dark brown.

• Journal of the Korean Society of Tobacco Science
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• v.14 no.2
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• pp.144-150
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• 1992

This study was carried out to investigate the effect of yield and quality on the harvesting time and methods of stalk cutting in Burley Tobacco.3 harvesting methods and 4 harvesting times of stalk cutting were compared to priming. The yield and quality were high when cut the stalk after second priming in stalk curing. It was also desirable that cut the stalk after second priming in stalk curing. It was also desirable that cut the stalk on 30 days after topping for standard fertilization(N-P2O5-K2O= 17.5-17.5-35.0kg/10a) plot, and 30-35 days after topping for 30% increased fertilization.