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김주희(J.H, Kim),김정운(J.U, Kim),신길호(G.H, Shin),최형국(H.K, Choi),김선우(S.W, Kim) 한국차학회 1997 한국차학회지 Vol.3 No.2
For cutting in vitro, culture conditions of tea plants, monthly contamination rate, selection of disinfectants and infectant exposure time, were investigated. Monthly contamination rates were 12% in May, 15% in Feburuary, 32% in November and 37% in September in vitro conditions. Therefore, it was considered that optimum cutting time was from March to April. The disinfectant of 95% ethanol and 7--8% CaOCl treated was heavily contaminated by 8~9% than 95% ethanol and 25% NaOCl treated by 3% but in the latter case, survival rate was reduced and the disinfective degree was reduced in low concentration. Contamination rates on disinfectant exposure time were 10~16% in the 95% ethanol and CaOCl treated for 15~20min and decreased by 9~11% in the 95% ethanol and 25% NaOCl for 15~20min. but necrosis rate of the latter was 18~79% and survival rate was reduced. The optimum disinfection conditions in vitro culture tea plants are as follows ; after dip plant in the 95% ethanol for 3~5 seconds, disinfect by 7~8% CaOCl treated for 15~20min. and rinse in sterilized water, 3~5 time repeatly.
차나무(Camellia sinensis L. var.sinesis) 정지시기가 수량 및 품질에 미치는 영향
김정운(J.W.Kim),신길호(G.H.Shin),김주희(J.H.Kim),김영신(Y.S.Kim),한재석(J.S.Han),최형국(H.K.Chio) 한국차학회 1997 한국차학회지 Vol.3 No.1
The purpose of this study is to consider the effect of skiffing time on tea leaf yields and quality in the first leave production. New tea leaves can be yielded ealier 6 or 7 day by skiffing at late September instead of late October. Cold damage (freezing damage) was tendency to increase by late skiffing time especially middle November damage rate increasedly to increase up to 25% by at late September than by at late October which was usual skiffing time in Korea. The contents of total nitrogen did not show a variation by skiffing time but that of tanning represent the higher by the more late of skiffing time. The reasonable skiffing time of tea plant was supposed that the late September which reache at average temperature 18~20˚C in Korea.
기계유유제 살포가 차응애(Tetranychus kanzawai) 발생 및 첫물차 생산에 미치는 영향
김정운(J.W. Kim),신길호(G.H. Shin),김주희(J.H. Kim),한재석(J.S. Han),최형국(H.K. Choi),곽수년(S.N. Kwack),최지현(G.H. Choi) 한국차학회 1999 한국차학회지 Vol.5 No.1
Effects of spraying of machine oil emulsim on occurrence of tea red spider mite. Tetranychus kanzawai and yield of first tea were evaluated. The results were summarized as follows : 1. Occurrence of tea red spider mite moved from basal part of harvest surface of east in February. to middle and top part of harvest surface. 2. The population density of tea red spider mite was high on expanded upper second leaves(38%) and upper first leaves(29.2%). Horever, the density of tea red spider mite on unexpanded leaves and basal leaves was low. 3. Control value of machine oil emulsion applied on 15 March was 45%, but was 36.3% at routine application of 15 February. Two applications on 15 February and 15 march was betler than one application against tea red spider mite. 4. Control value of machine oil emulsion diluted to 20 to 40 times was 42.5~50%, but was getting lower at dilution of 60 to 80 times. The yield of fresh leaves of application at dilntion of 20 to 40 times was increased 6~7% than that of 80 times. 290kg/10a. 5. Phytotoxicity was detected with slitht wilting when machine oil tmulsin was applied at dilu tion of 20 times. However, there was on phttotoxicity in the other trials.
金正云(J.W. Kim),申吉浩(G.H. Shin),金冑,禧(J.H. Kim),韓載錫(J.S. Han),吳美貞(M.J. Oh),崔炯局(H.K. Choi) 한국차학회 1998 한국차학회지 Vol.4 No.1
This experiment conducted for revealing the influence of skiffing strength on the yield and quality of tea leaves at the first yield, carried out from late April to early May. The results were as follows. 1. Light skiffing treatment facililate to move up the harvesting time by 3 to 4 days. 2. Heavy skiffing plants showed more decreased cold damage 34.9% than 10.8% in light skiffing. 3. Growth and yield were deteriorated as skiffing strength increased because emergence of new shoots were decreased by cold damage. 4. Among the contents of several components, total-nitrogen and free amino acid were increaed with treatment of hervy skiffing, but it is not significantly different, and tannin contents was decreased by heavy skiffing.
슈크로스 處理가 茶나무 凍·霜害 被害 輕減에 미치는 影響
金正云(J. W. Kim),申吉浩(G. H. Shin),金永信(Y. S. Kim),崔炯局(H. K. Choi) 한국차학회 1996 한국차학회지 Vol.2 No.1
Effect of sucrose and some chemicals on the reduction of frost damage was examined in tea plant. Percentage of frost damage on foliar application of sucrose decreased by 1.8% in the first crop of green leaf, therefore, yield increased by 13%. degree of frost damage was severer at the open bud than at leaf and in the treatment of low temperature than in the duration of cold treatment. Reduction of frost damage on time of folia application of sucrose was more effective at the treatment, march 20 than April 5.
金正云(J.W.Kim),申吉浩(G.H.Shin),金冑,喜(J.H.Kim),金永信(Y.S.Kim),韓載錫(J.S.Han),崔炯局(H.K.Choi) 한국차학회 1996 한국차학회지 Vol.2 No.2
The mean air temperature of tea growing areas were 12.8˚C in Kwangju, 12.9˚C in Kangjin, higher than 13˚C in Posong, Jeju and Hadong. In tea areas annual rainfalls were in the range above 1200mm. Soil class of tea areas except in Jeju where tea is grown on soil types derived from volcanic ash was loam to sandy loam on slope land in mountain area. Cultivas of the growing areas except for CV. Yabukita in Jeju and Kangjin were domestic varieties. Tea productivity was low and fileld operations were poor in Hadog, Sanchung, Kwangyang and Kurye.