Il Kyung Chung

Catholic University of Daegu, Kayō, Gyeongsangbuk-do, South Korea

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Publications (5)2.37 Total impact

  • T.K. SOn · J.H. Kim · C.M. Rico · I.K. Chung
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    ABSTRACT: Effects of calcium nitrate (CN) and sodium sulfate (SS) blossom thinning agents applied after selfincompatibility control substance (SICS) treatment on the fruit set rate and quality of apple were investigated for 2 cropping seasons. CN and SS at 0.1% and 0.2% concentrations were applied once (3 or 4 days after SICS treatment) or twice (3 and 5 or 4 and 6 days after SICS treatment). Commercial Japanese flower thinning agent (FTA: Ekoruki) treated and untreated apple trees were used as treated and untreated controls. SICS was sprayed 7 days before full bloom. Both agents showed a fertilizing effect in 'Hongno', improving its fruit yield and quality. SS obtained 29.8% and 36.3% thinning rates in the central floret of 'Fuji'. Both CN and SS were effective in 'Gala', which induced a lower fruit set than SICS treated plants. Earlier and double applications of CN and SS at 0.2% concentration resulted in a higher thinning rate and improved fruit quality in 'Gala'. Results also showed similar thinning efficacies in Ekoruki, CN, and SS.
    No preview · Article · Jun 2010 · Turkish Journal of Agriculture and Forestry
  • Tae Kwon Son · Jung Hee Kim · Cyren Rico · Sang Chul Lee · Il Kyung Chung
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    ABSTRACT: Effects of calcium nitrate (CN) and sodium sulfate (SS) blossom thinning agents applied after self-incompatibility control substance (SICS) treatment on the fruit set rate and quality of apple were investigated for 2 cropping seasons. CN and SS at 0.1% and 0.2% concentrations were applied once (3 or 4 days after SICS treatment) or twice (3 and 5 or 4 and 6 days after SICS treatment). Commercial Japanese flower thinning agent (FTA: Ekoruki) treated and untreated apple trees were used as treated and untreated controls. SICS was sprayed 7 days before full bloom. Both agents showed a fertilizing effect in 'Hongno', improving its fruit yield and quality. SS obtained 29.8% and 36.3% thinning rates in the central floret of TO: Both CN and SS were effective in 'Gala', which induced a lower fruit set than SICS treated plants. Earlier and double applications of CN and SS at 0.2% concentration resulted in a higher thinning rate and improved fruit quality in 'Gala'. Results also showed similar thinning efficacies in Ekoruki, CN, and SS.
    No preview · Article · Jan 2010 · Turkish Journal of Agriculture and Forestry
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    ABSTRACT: The effects of cultivar and cultivation temperatures on root extract, ash content and saikosaponin content of Bupleurum falcatum L were investigated using four Japanese and one Korean cultivars. Results showed that the Korean cultivar obtained higher root extract and saikosaponin contents but lower ash content than the Japanese cultivars at cultivation temperatures of 16.5-17.6℃. Higher cultivation temperature (21.0℃) consistently yielded low values in all parameters for both cultivars. Results also showed inverse relationships between root extract and ash content, and between ash content and saikosaponin content. On the other hand, root extract showed direct relationship with saikosaponin content. This study indicated the usefulness of component analysis of plant materials for traditional medicinal preparation since each plant material may have different concentration of their active ingredients.
    Full-text · Article · Feb 2009 · Journal- Faculty of Agriculture Kyushu University
  • T.K. SOn · J.H. Kim · C.M. Rico · I.K. Chung

    No preview · Article · Jan 2009
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    ABSTRACT: The effects of mixed treatments of wood vinegar (WV) and sulfonylurea-based herbicides on the weed control and the yield and yield components of transplanted rice were investigated. The herbicides tested were: pyrazosulfuron-ethyl+esprocarb [PSE; ethyl-5-[(4,6-dimethoxypyrimidin-2- ylcarbamoyl)sulfamoyl]-1-methylpyrazole-4-carboxylate+S-benzyl (RS)-1,2-dimethylpropyl (ethyl)thiocarbamate], pyrazosulfuron-ethyl+molinate [PSM; S-ethyl azepane-1-carbothioate] and pyrazosulfuron-ethyl+mefenacet [PSMF; 2-(1,3-benzothiazol-2-yloxy)-N-methylacetanilide]. Five treatments were used: 1 ) recommended (RH: 100%), 2) half-recommended (HRH: 50%), 3) HRH + 500 (1 mL wood vinegar 500 mL-1 water), 4) HRH + 1000 (1 mL wood vinegar 1000 mL-1 water) and 5) untreated control. Results showed that only PSM significantly increased the efficacy of HRH while PSE and PSMF already obtained high efficacy in HRH alone. Higher rice yield was obtained in the HRH plus wood vinegar treatments of PSM. On the other hand, a decrease in rice yield was observed in the HRH plus wood vinegar treatments of PSE and PSMF compared with the RH and HRH treatments. Data on yield components showed no significant variations in values among the treatments. No clear trend for grain appearance and nutritional quality was observed.
    No preview · Article · Dec 2007 · The Philippine agriculturist