• Journal of Biosystems Engineering
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• v.19 no.3
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• pp.247-257
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• 1994

Optical properties of the tobacco leaves were determined. Surface colors and reflectance characteristics of the flue-cured variety and the Burley variety with thin and thick leaves were measured. Color was measured by CIE colorimeter and reflectance was measured with a laboratory built reflectance meter utilizing optical bandpass filters whose center wavelengths are from 400 to 700 nm at intervals of 50 nm. The resulting data indicated that the measured color and reflectance would be useful in inspecting tobacco. However no single optical data could be used to successfully grade tobacco leaves.

• Korean Journal of Veterinary Research
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• v.4 no.1
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• pp.15-17
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• 1964

Scabby burley collected in Kyong Sang Nam Do fed to healthy dogs, age less than 2 years, old and determined the Choline-Esterase Activity in blood of dogs. The results obtained in this investigation are summarized as follows. 1. Choline-Esterase Activity in the blood of dogs fed Scabby barley has been decreased. 2. The poisionous component of the Scabby barley thought to be Anticholinesterase.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.30 no.4
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• pp.347-351
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• 1985

The effect of leaf water content on apparent photosynthesis and respiration of tobacco plants(five varieties) was studied under the condition without the irrigation for 10 days after the plants were sufficiently watered on the first day. The wild race (N. longiflora) among varieties showed highest apparent photosynthesis (AP) and AP had a positive correlation with specific leaf weight. N. longiflora and Andongyeob were different in their AP from the other varieties significantly under the water stress condition. Respiration rate also decreased to be simillar to AP except slight increase at early stage of water deficit. The stomatal resistance and the mesophyll resistance increased in the stressed plants. The water stress resistant character seems to be mainly due to open stomata.

• Journal of the Korean Society of Tobacco Science
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• v.30 no.2
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• pp.94-102
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• 2008

In this paper, we describe our study on the characterization of tobacco leaves by their pyrolysis patterns. Two kinds of tobacco leaves were pyrolyzed and analyzed by Double-Shot Pyrolysis-Gas Chromatography/Mass Spectroscopy (Py-GC/MS) methods. Three grades of Korean flue-cured tobacco leafsuch as B1O, AB3O, CD3L and burley tobacco leaves such as B1T, AB3T, CD3W were pyrolyzed with six discrete but stepwise heating temperature ranges, those are from 100$^{\circ}C$ to 150$^{\circ}C$, 150$^{\circ}C$ to 200$^{\circ}C$, 200$^{\circ}C$ to 250$^{\circ}C$, 250$^{\circ}C$ to 300$^{\circ}C$, 300$^{\circ}C$ to 350$^{\circ}C$ and finally from 350$^{\circ}C$ to 400$^{\circ}C$. Using the resultant 52 pyrolytic components identified in the programs as components, principal component analysis (PCA) showed statistical classification between flue-cured and burley tobacco lamina. Among six pyrolysis temperature ranges, the best discrimination was achieved at the temperature range from 250$^{\circ}C$ to 300$^{\circ}C$ and from 300$^{\circ}C$ to 350$^{\circ}C$.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.31 no.4
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• pp.420-425
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• 1986

This study was conducted to investigate the influence of air temperature and relative humidity on excessive drying rate of burley tobacco. In experiment I, 4 temperatures and I humidity by day and air curing by night were treated from initial curing stage. In experiment II, 15 combinations of 3 temperatures and 5 humidities were applied from the yellow stage of cure. Yellowish cured leaves resulted from overdrying at high temperature and especially, at low humidity. How- ever, these were not produced at 75-80% RH and under 35$^{\circ}C$ by day with air curing b y night. The proper range of temperature and humidity for desirable color of cured leaf were the combinations of 30$^{\circ}C$, 75-80% RH or 35$^{\circ}C$, 80-85% RH. As excessive drying leaves increased, physical properties of cured leaves were poorer and chemical contents were less decomposed.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.34 no.4
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• pp.331-334
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• 1989

This studies were carried out to investigate the effects of the management of curing barn and the use of supplemental heat on prevention of barn rot during the rainy season. The managemental methods of curing barn were combined with hanging spaces ranged from 15cm to 30cm and ventilating conditions. The supplemental heat was applied with oil burner and oil fan heater. Barn rot was reduced in the wider hanging spaces, and the effects of hanging spaces was larger with ventilating during curing. Barn rot decreased by ventilating condition than non-ventilation. The use of supplemental heat dropped to lower relative humidity in curing barn. Supplemental heat and forced-air movement greatly reduced barn rot in comparison with tobacco cured under natural conditions.

• Korean journal of applied entomology
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• v.23 no.4 s.61
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• pp.209-214
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• 1984

Since 1980, burley tobacco plants grown mainly in the western hat of the Korea. have shown two new types of disease symptom. Both symptoms were found to be caused by two different PVY strains : the vein banding type by a PVY strain designated as PVY-VB and necrosis on leaf veins by a PVY strain designated as PVY-VN, Identification of the PVY strains was based on host range test. aphid( Myzus Persicae) transmission test, physical properties, serology, and observation of virus particle morphology. The virus particles were measured to be about 730 nm without any difference in shape or dimensions between the two strains. Both strains also gave a positive reaction to the PVY antiserum in SDS-agar gel double diffusion test. These strains, however, gave a negative reaction to the tobacco etch virus and tobacco vein mottling virus antisera.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.32 no.3
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• pp.310-316
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• 1987

A field experiment was conducted to find out the effects of liming(soil pH) and sources of N on growing characters and yield of burley tobacco. Treatments consisted of liming(nonliming, liming to soil pH5.5 and 6.5) as the main plot and N sources(compound fertilizer of containing 3.9% NH$_4$-N and 6.1% NH$_2$-N, NaNO$_3$,(NH$_2$)$_2$CO and (NH$_4$)$_2$SO$_4$as the sub-plot. The growth of vegetative growing stage of limed plots were delayed(to compare the nonlimed plot) by influence of alkali. When the source on N was NaNO$_3$ the growth of vegetative growing stage was unfavorable and the yellowing of lower leaves of maturing stage was rapid. The yield and value of cured leaf was increased by increasing the rate of Ca(OH)$_2$, but there was no significant differences among the source of N. The yield response to liming was greater when the source of N was (NH$_4$)$_2$SO$_4$ than that of any other plots.

• Journal of the Korean Society of Tobacco Science
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• v.28 no.1
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• pp.9-16
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• 2006

To get the informations of burley leaf, the chemical constituents, quality indices, leaf color and the effects of climatic factors on the physicochemical properties of leaf produced from 2000 to 2004 crop years at 6 growing areas were analysed. The average leaf chemical contents for 5 years were as follows ; nicotine 2.87%, total nitrogen 4.55%, and chlorine 0.57%. The nicotine content was low while total nitrogen was slightly high as compared with recommended contents(nicotine ; $3.0{\sim}3.5%$, total nitrogen; $4.0{\sim}4.5%$). The variations of physicochemical properties among crop years were high while those of growing areas were relatively low. The nicotine contents of upper leaves were positively correlated to the sunshine hours in June and negatively correlated to the rainfalls in June and July according to crop years. However the total nitrogen content of upper leaves were positively correlated to the rainfalls in July according to growing areas. The tan-tended colored leaves were produced under the high air temperature, drought and long sunshine weather condition while the buff-tended colored leaves were produced under the contra교 condition according to crop years. It is considered that the increasing of nicotine content of Lugs may be available to decrease the nitrogen number(nitrogen/nicotine ratio) of leaf tobacco.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.28 no.2
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• pp.252-257
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• 1983

This study was conducted to find out the stalk curing methods that can reduce photobleaching, and shorten the curing period in burley to bacco stalk curing. The results obtained summarized as follows. In the ventilation window-plot, the temperature within the curing house was high and the curing period was shortened, too. The rate of photobleached leaves of whole plant stalk curing-plot was higher than those of any other plots. In the ventilation window-plot, the labor of operating the curing house was saved and the yield and visual quality of cured leaves were high, too. For reducing the photobleaching of leaves, following procedures are desirable; to prevent the lower leaves from drying up and overripening at maturing stage, cut the stalk after first or second priming, shorten the curing period as possible when the 80% of leaf bodies changed brown.