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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),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.
崔正(J.Choi),千鍾殷(J.U.Chon),朴章炫(J.H.Park),申吉活(G.H.Shin),林根喆(K.C.Lim),曺圭采(K.C.Cho) 한국차학회 2001 한국차학회지 Vol.7 No.2
A quality of the tea components depends on picking times leaf ages, varieties and environmental factors, and those factors and very important for high quality green tea. As for screening and testing quality in lots of germplasms, and early generation of hybrids, a simple method for analysing contents of total nitrogen, amino acids, tannin and caffeine is needed. Tea leaves of 115 lots were collected from different sites, picking times, varieties. They were dried, ground and the their chemical components were analyzed by near infrared spectroscopy (NIR). The relationship between laboratory analysis and NIR spectroscopy was highly significant in caffeine (R²=0.98**), total nitrogen (R²=0.94**), tannin (R²=0.94**), and total amino acids (R²=0.88**), respectively. The standard errors of calibration and performance were 0.253% and 0.268% for total nitrogen, 180.87mg/100g and 244.52mg/100g for total amino acids, 0.994% and 1.202% for tannin, 0.144% and 0.204% for caffeine, respectively showing values were within allowable. The correlation of validation (1-VR) showed high coefficients (0.91**~0.97**). Accuracy and precision of NIRs predictions were adequate for quality assurance to analyse the four components in tea leaves. Those results can be concluded that NIR method in very suitable for the determination of tea leaf component contents.