Prevention of barn rot during curing of burley tobacco, 1; Effect of harvesting time and curing condition
1989
Bae, S.K. (Korea Ginseng and Tobacco Research Inst., Chonju (Korea Republic). Chonju Experiment Station)
This study was carried out to investigate the effect of environmental conditions of air temperature and relative humidity, varieties, and water content of leaves at harvesting time on the occurrence of barn rot during curing of burley tobacco. The curing environmental condition was combined with 4 air temperatures ranging from 25deg C to 40deg C and 3 different relative humidities. The harvested leaves with 3 different water contents were cured during the rainy season in curing barn. Barn rot occurred the most at 30deg C, and reduced at 25deg C and remarkably decreased at above 35deg C. But no barn rot was observed at 40deg C. In influence of relative humidity, the percentage of rotten leaves was highest at 100 % RH and remarkably reduced at lower RH. Among two varieties, KB 101 was rotted smaller than Burley 21 under the all temperature and relative humidity conditions, however those considerably showed no difference. The rate of disease development increased in the lower leaves more than in the upper leaves. In the water content of leaves at harvesting time, 29.5 % of the rotten leaves was observed at W. S. D. (water saturation deficit) 10.3 %, but no barn rot was found at W. S. D. 6.4 %
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