Effect of Slow-Release Fertilizer on Yield and Quality of Third-Harvest Tea Leaves

A field experiment was conducted to evaluate the effect of slow-release fertilizer on the yield and quality of the third-harvest tea leaves. The yield of the third harvested tea leaves was decreased to 5.8-14.4% in slow-release fertilizer block, except to the N $50kg\;10a^{-1}$ ($316kg\;10a^{-1}$), compared to traditional urea treatment ($313kg\;10a^{-1}$). Nitrogen uptake and nitrogen uptake efficiency of slow-release fertilizer was reduced as nitrogen application level increased. The contents of chemical components related to the tea quality such as total-nitrogen, total amino acid, chlorophyll and theanine were somewhat lower in the slow-release fertilizer treatments, except to the treatment of N $50kg\;10a^{-1}$, than those in the traditional urea application, but those of tannin, caffeine and vitamin C were not different among the treatments. In scoring test, apparence and quality of green tea of the slow-release fertility treatments were not different, except to the N $40kg\;10a^{-1}$ treatment, compared to those in the treatment of urea. In conclusion, slow-release fertilizer and conventional urea treatments showed not different in both yield and quality of green tea.

세물차의 수량 및 품질에 미치는 완효성비료 시비효과

세물차의 수량은 관행시비구의 $313kg\;10a^{-1}$에 비해 완효성비료 N $50kg\;10a^{-1}$구의 $316kg\;10a^{-1}$를 제외한 다른 완효성 비료 시비구에서는 5.8-14.4% 감수하였다. 질소 흡수율과 이용율은 질소 시비량이 증가 할수록 감소하는 경향이었다. 관행시비에 비해 N $50kg\;10a^{-1}$ 처리를 제외한 나머지 완효성비료 처리구에서는 총질소, 총아미노산, 엽록소 및 감칠맛의 주성분인 theanine 함량이 적었고, tannin, caffeine, 비타민 C 함량에서는 차이가 없었다. 형상, 향, 맛 등 제다 품질은 N $40kg\;10a^{-1}$을 제외한 나머지 완효성시비구와 관행시비구 간에 큰 차이를 볼 수 없었다. 결론적으로 수량 및 품질에서 관행시비나 완효성비료시비 상호간에 큰 차이를 볼 수 없었지만, 완효성비료 N $50kg\;10a^{-1}$구에서 기타 처리보다 약간 양호한 경향이었다.