• Korean Journal of Weed Science
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• v.9 no.2
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• pp.168-173
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• 1989

In the characteristics of intra-specific competition according to bulrush density, the intra-specific competition in plant height began at 5 and 15% per pot in mixed culture and bulrush monoculture, respectively. The intra-specific competition in the shoot began at 5 plants per pot in both mixed culture and bulrush monoculture. The competition in dry matter weight began at 15 plants per pot in monoculture, and at 10 plants in mixed culture. On the rice density, the plant height, and numbers of shoot and dry matter weight in rice were rapidly increased up to 2.6, and 2.5 plants per pot, respectively, And then the increments were slow, The critical intra-specific competition of bulrush with rice was 2.5 to 3 plants per pot in their traits of rice, and especially the number of shoots and dry matter weights per pot showed significant decrements. In the different transplanting time in rice, the plant heights in both rice and bulrush elongated longer in mixed culture than in monoculture. The plant height of bulrush became shorter but the height of rice longer with late transplanting. The ratio of shoot number in rice to the number in bulrush was about 1 : 3 in all plots, and shoot numbers became less by late transplanting. The dry matter weight in both species were decreased by late transplanting, and the decrements were more prominent in bulrush than in rice.

• Korean Journal of Soil Science and Fertilizer
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• v.27 no.4
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• pp.284-289
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• 1994

A nutrient solution culture experiment was conducted in the greenhouse of Suwon Campus, Kyung-Hee University from May 23 to July 11, 1994, to determine the effects of phosphorus application on seedling growth of Kwanganok and Hwengsungok cultivars of corn. Plants were harvested at weekly interval for seven weeks, at which time plant height, leaf area and dry matter yield of corn seedling were measured. The major results obtained are as follows. In without phosphorus pot, seedlings of Kwanganok and Hwengsungok cultivars have hardly been growing from planting to harvesting time. Plant height, leaf area and dry matter yield of both cultivars were increased more in the seedlings grown under complete treatment compared with the other phosphorus treatments. The total plant height, leaf area and dry matter yield during the whole period of Kwanganok and Hwengsungok cultivars were decreased in order of C>2P>3P>-P application pot. The crop growth rates of seedlings of both cultivars with in all treatments were slow until the 4th week after planting. Kwanganok with 2P and 3P treatment pot and C pot of Hwengsungok reached the maximum CGR at the 5th to 6th week after planting and showed declined CGR's thereafter, but Kwanganok C and Hwengsungok 2P treatment pots maintained a steady increase in CGR's until the end of the experiment period.

• Korean Journal of Plant Resources
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• v.7 no.1
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• pp.17-22
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• 1994

This study was carried out to investigate the optimum medium and concentrations of growth regulators for induction of multiple shoot by meristem culture of floe otorefcenf Mill. MS medium supple-mented with 3${\mu}{\textrm}{m}$ TDZ was effective for induction of multiple shoot. Shoot multiplication was more ef-fective when 2mg/1 BA combined with 0.Img/1 IAA than when only BA were treated on medium. Halfstrength of MS medium supplemented with 2mg/L IAA was effective for rooting of shoots regenerated.When plantlets regenerated from meristem culture were transferred to pot, survival rate of plantletswas 80% on perlite and was 95% on vermiculite, respectively.

• Journal of Applied Biological Chemistry
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• v.52 no.3
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• pp.116-120
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• 2009

We found out the new method of the consortium for the environmental friendly agriculture by 8 kinds of the selected antagonistic rhizobacteria. This research involved composition of mutual complementary consortium by each antagonistic function such as production of antibiotic, siderophore, antifungal cellulase and insoluble phosphate solubilization. The consortium No.11 among composed consortium candidates showed the most pepper growth promoting activity and Phytophthora blight suppression on the in vivo pot test of red-pepper plant. The consortium No. 11 is combination of PGPR Bacillus subtilis AH18 and Bacillus licheniformis K11. B. subtilis AH18 and B. licheniformis K11 both could produce the auxin, antifungal ${\beta}$-glucannase and siderophore. Also, they had mechanism for solubilization of insoluble phosphate. But, B. licheniformis K11 could produce the antibiotic of iturin which was able to inhibit Phytophthora capsici. We confirmed complementary noncompetitive mutualism between B. subtilis AH18 and B. licheniformis K11 of the consortium No.11. The results came out through treatment of two strains co-culture, treatment of individual culture and co-treatment of two individual cultures for the growth and Phytophthora blight suppression of red-pepper. The treatment of two strains co-culture didn't show a synergic effect in comparing sole treatment on the pepper growth promotion and Phytophthora blight suppression. But, when the pots were treated simultaneously with co-treatment of two individual cultures, an synergic effect was seen in the growth promotion of roots, stem, leaves and suppressed Phytophthora blight on red-pepper in vivo pot test.

• Journal of Plant Biotechnology
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• v.39 no.4
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• pp.225-234
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• 2012

This report describes recent advances in tissue culture and genetic transformation of commercial Phalaenopsis. Recently, an importance of Phalaenopsis has been increased due to its popularity with beautiful flowers and is widely used for pot plants as well as cut-flower. Its use is rapidly enlarging in worldwide. Thus, demands for the release of new elite cultivars in Phalaenopsis have been increased. During the last several decades, some critical progresses have been made in tissue culture and genetic transformation in Phalaenopsis species. Cooperation with these biotechnological methods are supposed to promote the release of commercial Phalaenopsis cultivars in the near future. Until now, no technical review on tissue culture and genetic transformation in Phalaenopsis has been reported in Korea. Therefore, we inquired the brief history and techniques of tissue culture system in Korea.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2002.11b
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• pp.28-28
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• 2002

• Proceedings of the Plant Resources Society of Korea Conference
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• 2005.11a
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• pp.153-153
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• 2005

• 한국약용작물학회:학술대회논문집
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• 2012.05a
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• pp.75-76
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• 2012

• Journal of Conservation Science
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• v.26 no.3
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• pp.269-276
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• 2010

This study aims to extract manufacturing techniques by analysing metallurgical characteristics of the cast-iron pot from Bubjusa, examining corrosion status and microstructure with a optical microscope, SEM-EDS, micro vickers hardness tester and XRD. The microstructure analysis has presented that ferrite and partial portion of pearlite exist within the corroded outer layer. The analysis of the inner layer revealed that there is pearlite and graphite of feather shape. The one of the middle layer, which is placed between outer and inner layer, showed that corrosion has been heavily developed. Micro vickers hardness values range from 217Hv to 698Hv in constituent layers and such values lie within the ranges of the ancient iron relics. The result of EDS analysis for each microstructure presented that the outer layer has been more decarbonized than the inner layer. XRD analysis of iron corrosion compound revealed that Goethite and Hematite had been produced from the corrosive process of iron. The study concludes that the large iron pot was made by casting technique, and microstructure of inner layer had a gray cast iron. Outer layer has been decarbonized through repetitive process of heating and cooling. This results can be used as fundamental data for comparative study to reveal manufacturing techniques of large cast-iron pot.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.36 no.6
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• pp.545-553
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• 1991

To find out the basic data for the possibility of agricultural utilization for GSA (Glutamine Synthetase Activity), the effect of nitrogen on the GSA in wheat leaf discs, the variation of GSA after light treatment and the comparative activity of GS during preservation were studied. The result of this study suggested that GSA could play an important and direct regulatory role in the nitrogen assimilation by wheat. During the growth stage of wheat its integral activity was found to closely match the organic nitrogen content. GS may therefore be the rate limiting enzyme in inorganic N assimilation. Moreover, integral GSA was closely correlated with grain yield and grain nitrogen. GSA could be suitable to utilize as a parameter for super type selection and an indicator for optimum nitrogen fertilization. Throughout the experiment, the contents of NO; were increased by N fertilization so that the NO; content was not attributable to change in the level of GSA. At investigation during dark-light transition of culture, no change in the level of GSA was observed until after 8-14 hours in the light treatment. And the level of GSA in wheat leaf discs during preservation at refrigerated storage $(-20^{\circ}C)$ was stable until 12 weeks, when its leaf discs were sampled with liquid nitrogen.