• Journal of Bio-Environment Control
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• v.1 no.1
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• pp.21-27
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• 1992

The effects of different night temperatures and NO$_3$$^{[-10]}$ : NH$_4$$^{+}$ ratios in nutrient solution on the growth and quality of Chinese white cabbage(B. chinensis L. var. chinensis) and Chinese flat cabbage(B. chinensis L. var. rosularis) were studied. The results were summarized as follows. 1. Fresh weight was increased higher in night temperature 15$^{\circ}C$ than 5, 1$0^{\circ}C$, but content of vitamin C and dry weight ratio were increased as night temperature was lower. 2, The growth of Chinese white cabbage and Chinese flat cabbage was bad extremely in NO$_3$$^{[-10]}$ : NH$_4$$^{+}$(0 : 8), and the others were little different 3. In nutrient solution, the higher NO$_3$$^{[-10]}$ -N concentration was, the more content of vitamin C, and the higher NH$_4$$^{+}$-N concentration was, the more dry weight ratio.ratio.

• Journal of Bio-Environment Control
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• v.1 no.2
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• pp.135-141
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• 1992

Effects of various artificial light sources on the growth of Chinese white cabbage, Chinese flat cabbage, lettuce, garland chrysanthemum, and green perilla were investigated. Plants were grown under different treatments for three weeks. Generally, the growth of artificial light treatment were better than natural daylight(ND). The greatest growth and external quality occurred in high-pressure sodium lamp(HPS). In incandescent lamp(IL), fresh weight was heavy, but marketable quality was poor because of succulent(or spindly) growth. Overall, vitamin C content were no difference among treatments. But relative chlorophyll content was somewhat high in HPS.

• Journal of Bio-Environment Control
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• v.2 no.1
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• pp.9-15
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• 1993

Chinese white cabbage, Chinese flat cabbage, lettuce, garland chrysanthemum, and green perilla were grown in nutrient solution culture to investigate the effects of various media and nutrient solutions. The culture media were sand, mixed substrate(peatmoss : sand= 1 : 1), and non-media(deep-flow culture). The nutrient solutions were Cooper's, Hoagland's, and Yamazaki's solution. Plants were grown under different treatments for three weeks. Generally, the growth was greatest in non-media culture and followed mixed substrate culture, and poorest in sand culture. In non-media culture, the growth of Chinese white cabbage, Chinese flat cabbage, lettuce, and green perilla was good in Yamazaki's solution. And regardless of nutrient solution, garland chrysanthemum was good in non-media culture. Relative chlorophyll was not different among the treatments.

• Journal of Bio-Environment Control
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• v.6 no.2
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• pp.117-122
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• 1997

The effect of ceramics in the nutrient solution on the growth of Chinese flat cabbage(Brassica campestris L. var. Tacai) was studied at the favourable root temperature of 3$0^{\circ}C$ and at the greenhouse air temperature of fixed $25^{\circ}C$. Ceramic No. 2 was produced the greatest dry weight, while ceramic No. 3 was lower productive than those of untreatment in each root temperature. Shoot/root dry weight ratio was reduced at treatments with ceramics, which may be explained by rich root growth, and it increased as raising the temperature from 25 to 3$0^{\circ}C$ or 35$^{\circ}C$. The treatments of ceramics made lower water content/dry weight($m\ell$/g) ratio of Tacai than untreatment. The electrical conductivity and inorganic matters of ceramics were low level(EC 0.001 -0.03mS/cm). Also, the blue ceramic No. 3 of them had strong antibacteria in LB medium and ceramic treatments was inhibited the rot of solution.

• Korean journal of applied entomology
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• v.20 no.3 s.48
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• pp.135-145
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• 1981

Vegetables including Chinese cabbage and radish have been grown in alpine areas such as Muju, Namweon, Jinan and Jangsu during the shortage period of vegetables. The incidence of various diseases, environmental factors such as temperatures and rainfalls, and aphid populations as virus vector were observed at 10-day intervals from July to September in those areas. Disease incidence showed no significant difference among locations. Major diseases in Chin ese cabbage were bacterial soft rot, white spot, downy mildew, mosaic virus, Alternaria leaf spot and Fusarium seedling blight. Major diseases in radish were virus, white rust, black rot, root rot, leaf spot and Fusarium seedling blight. Disease incidence reached peak on Aug. 20 with $27\%$ infection in radish and with $20\%$ infection in Chinese cabbage during the growing season, and declined thereafter. Percentage of infection in each growth stage showed $25\%$ at root thickening stage and $26\%$ at the harvest time in radish; and the head formation stage, $24\%$ at the harvest time. The data indicate that disease incidence in radish increased rapidly at late growing stage and progressively increased in Chinese cabbage Seedling blight caused by Fusarium sp. and root rot caused by Aphanomyces sp. were also observed in those areas. Cool and wet weather appeared to be favorable for disease incidences during the rainy period of growing season although average temperature was about $25^{\circ}C$. Populations of aphids were lower in the alpine vegetable growing area than that of flat areas. Aphids as virus vectors from total aphids collected were $73.5\%$ or 289 virus vectors /993 total aphids in Namweon and $18.1\%$ or 31 virus vectors/171 total aphids in Muju. The most prerevalent species of aphids was Myzus persicae Sulz.