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박장현(JㆍHㆍPark),신기호(KㆍHㆍShin),최 정(JㆍChoi),한재석(JㆍSㆍHan),임근철(GㆍCㆍLim) 한국차학회 2002 한국차학회지 Vol.8 No.2
A field experiment was conducted to evaluate effect by split-application method of slow-release fertilizer on the tea plant. The yield of the 1st harvested tea leaves had increased 3% in the slow-release fertilizer(two time split manuring) compared with the traditional manuring(four time split manuring), and that of the slow-release fertilizer to one time split manuring was decreased 14±3%. In case of the 1st harvested leave, the contents of chemical components related to quality such as total nitrogen, total amino acid, caffeine, chlorophyll, vitamin C, fatty acid and theanine were somewhat higher in the slow-release fertilizer(two time split manuring) than those of the traditional manuring, but that of tannin was low. The one time split manuring of slow-release fertilizer had a contrary tendency with two time split manuring treatment. In scoring test, appearance and quality of green tea were more excellence in the two time split maunring compared with one time split manuring of slow-release fertilizer and with the traditional manuring (four time split manuring). Yield of tea was increased, quality of tea was improved and loss of N, P, K was decreased with use of slow-release fertilizer.
박장현(J.H. Park),김용웅(Y.W. Kim),김정봉(J.B. Kim),최정(J. Choi),최형국(H.K. Choi),김상철(S.C. Kim) 한국차학회 1998 한국차학회지 Vol.4 No.2
The reasonable level of nitrogen fertilizes are a key factor to reduce environmental contamination as well as to increase crop yield and quality. As the application amount of nitrogen fertilizer increased, the yield of tea leaves, the contents of vitamin C and chlorophyll increased; however, excessive level 150 kg/l0a showed decreaed the yield of tea leaves. (60 kg/l0a : 440 kg ⇒ 150 kg/l0a : 465kg) On the other hand, the increased level of nitrogen fertilizer did not show difference in contents of total nitrogen, total free amino acid, caffeine and tannin, while those contents were increased or decreased to 60 kg/10a, but showed counter appearance from 72 kg/10a. As the application amount of nitrogen fertilizer increased, contents of 4 anions except F⁻ and 4 cations except Ca²⁺ were increased. Eleven kinds of amino acids was isolated from third harvested leaves of tea where the content of theanine occupied over 50% ; from 420 to 572 mg/100g. The contents of fatty acids and catechin did not show correlation with application level of nitrogen fertilizer. The content of fatty acid was produced 1,614~1,801mg/100g, and content of catechin was produced 12.83~13.83%. In scoring test, 60 kg/l0a treatmemt was 1.0~7.0 point higher compared to other treatments. Consequently, 60 kg/l0a is considered to be best level of nitrogen fertilizer in terms of increase crop yield, quality, and scoring test.
박장현(J.H. Park),김정운(J.W. Kim),김정근(J.K. Kim),한재석(J.S. Han),신기호(G.H. Shin),최정(J. Choi),최형국(H.K. Choi) 한국차학회 1999 한국차학회지 Vol.5 No.2
Chemical constituents in the different parts of tea shoots were investigated for green tea. "Okro". The contents of total nitrogen, caffeine and vitamin C at the leaves were decreased with growing, while those of total amino acid and chlorophyll were the highest at the 5th leaves and in the 3rd leaves, respectively. The content of tannin ranged from 8.63% to 12.29%. The content of tannin at the 1st leaves was the highest as 12.29% and that of the 4th leaves was the lowest as 8.63%. The contents of free amino acids at the stem was the highest as 4,675 mg/100g and most of amino acids except for theanine were greater at the lower part and mast of amino acids contents were higher at the stem than at the leaves. The content of fatty acids at the 2nd leaves was the highest as 3.594 mg/100g and that at stem was the lowest as 1.376 mg/100g. The contents of palmitic acid and stearic acid were the highest in the 5th leaves and those of oleic acid, linoleic acid and linolenic acid were the highest at the 2nd leaves. In conclusion, the 5th leaves among tea shoots plucked before the 2nd shading for 15 days could be used to manufacture Okro.
박장현(J.H.Park),박근형(K.H.Park),임근철(K.C.Lim) 한국차학회 2001 한국차학회지 Vol.7 No.2
At harvesting tea plant leaf, moisture of tea leaves was 79.5%, and percentage of banjhi shoot to the total was 77.8%, and weight of 100buds was 29.41g. Rate of manufacture goods by Okro tea was increased because of slight powder and mass after made tea by 100℃ at 20 second steaming plus primary drying treated during 60min, at 80℃. Steaming treatment 20 second at 100℃ plus primary drying treated 60 min, at 80℃ and steaming treated 30 second at 100℃ plus primary drying treated 50 min, at 90℃ was higher contents of total nitrogen, total amino acid and chlorophyll than those of other treatment, but content of tanning was lower than in the other treatment. Consequently, these results meant that 100℃ 20second + 80℃ 60 min, treatment was considered to by the best streaming and primary drying tea rolling condition.
박장현(J.H.Park),임근철(G.C.Lim),신기호(K.M.Shin),최정(J.Choi),한재석(J.S.Han) 한국차학회 2001 한국차학회지 Vol.7 No.3
Examinated results for bring light on the kinds of slow-release fertilizers are summarized as follows. Among slow-release fertilizers, the yields of the 1st harvested tea leaves in the T₂ treatment was higher 9±4% with values of 366mg/100g than in other slow-release fertilizers treatment(325~352mg/100g), and was higher 14% than in traditional manuring (321mg/100g). The contents of chemical components such as total nitrogen, total amino acid, chlorophyll, vitamin C and free sugar were somewhat higher in T₂ treatment than those of other tratments. However, the content of tannin and caffeine were slightly lower than in the other treatment. The contents of theanine, glutanic acid and arginine as a good teaste component of green tea were higher in the T₂ treatment than in the other slow-release fertilizers and traditional manuring. In scoring test, the slow-release fertilizers treatment was not different the traditional manuring significantly. The yield and quality of T₂ treatment were more excellent than in other slow-release fertilizers and in traditional mauring.