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Kweon, Hun-Joong,Kim, Mok-Jong,Moon, Yong-Sun,Lee, Jin-Wook,Choi, Cheol,Choi, Dong-Geun,Lee, Dong-Hoon,Kang, In-Kyu Korean Society of Horticultural Science 2012 원예과학기술지 Vol.30 No.1
This study was carried out to evaluate the effect of pre-harvest factors on fruit quality and the incidence of storage disorders in 'Fuji' apple during CA storage. Incidence of storage disorders varied, depending on the growing regions, field conditions, and altitude of the orchards. Results indicated that fruit maturity may play a crucial role in the incidence and severity of flesh browning and watercore. The incidence of these storage disorders increased with fruit maturity until 180 days after full bloom (DAFB). In addition, occurrence of watercore was correlated with the incidence of flesh browning during CA storage. The incidence of flesh browning was positively correlated with the sum of the diurnal temperature range from September through October and amount of precipitation from August to October in 1996-1999 growing years. These results suggested that 'Fuji' apple should be harvested no later than 180 DAFB because the late harvested fruits were prone to development of watercore which was correlated with the incidence of flesh browing during CA storage in Korea.
Hun-Joong Kweon,Mok-Jong Kim,Yong-Sun Moon,Jinwook Lee,Cheol Choi,Dong Geun Choi,Dong Hoon Lee,In-Kyu Kang 한국원예학회 2012 원예과학기술지 Vol.30 No.1
This study was carried out to evaluate the effect of pre-harvest factors on fruit quality and the incidence of storage disorders in 'Fuji' apple during CA storage. Incidence of storage disorders varied, depending on the growing regions, field conditions, and altitude of the orchards. Results indicated that fruit maturity may play a crucial role in the incidence and severity of flesh browning and watercore. The incidence of these storage disorders increased with fruit maturity until 180 days after full bloom (DAFB). In addition, occurrence of watercore was correlated with the incidence of flesh browning during CA storage. The incidence of flesh browning was positively correlated with the sum of the diurnal temperature range from September through October and amount of precipitation from August to October in 1996-1999 growing years. These results suggested that 'Fuji' apple should be harvested no later than 180 DAFB because the late harvested fruits were prone to development of watercore which was correlated with the incidence of flesh browing during CA storage in Korea.
Effects of Harvest Maturity on Storability of Refrigerated Air-Stored ‘Fuji’ Apples
Hun-Joong Kweon,Mok-Jong Kim,Cheol Choi,In-Kyu Kang 한국원예학회 2006 Horticulture, Environment, and Biotechnology Vol.47 No.1
This study was conducted to determine the effect of harvest date on fruit quality during cold storage period in ‘Fuji’ apples. Fruits were harvested 170, 180, and 190 days after full bloom and stored in a cold storage chamber at 0 ± 1℃ with 85?90% relative humidity. Ethylene production, respiration, and quality factors were investigated during 6 months of the cold storage. Though respiration was not significantly different among harvest dates during storage, respiration rate tended to be higher in late harvested fruits. Internal ethylene and ethylene production were increased by advanced maturity. Soluble solids were not significantly changed during storage. Acidity and firmness, in contract, were decreased during the cold storage. Acidity of fruits stored for 180 days decreased 0.19, 0.18, and 0.12% in 170, 180, and 190 days harvested fruits after full bloom, respectively. Fruit firmness during storage was higher in 170 days harvested fruits than in 180 and 190 days harvested fruits after full bloom. Weight loss was high in late harvested fruits. These results suggest that the suitable cold storage periods of ‘Fuji’ apples are 180, 150, and 120 days in 170, 180, and 190 days harvested fruits after full bloom, respectively.
국내 사과 주요 품종들의 자발휴면 타파에 필요한 저온요구도
권헌중(Hun-Joong Kweon),사공동훈(Dong-Hoon Sagong),송양익(Yang-Yik Song),박무용(Moo-Yong Park),권순일(Soon-Il Kwon),김목종(Mok-Jong Kim) 한국원예학회 2013 원예과학기술지 Vol.31 No.6
본 시험은 품종별 휴면 개시점 탐색, 자발휴면 타파시기 및 발아에 필요한 저온(7.2°C 이하, 0.0-7.2°C) 누적시간을 구명하여 국내 주요 사과품종(‘후지’, ‘쓰가루’)들과 국내에서 육성한 품종(‘홍로’, ‘선홍’, ‘홍금’, ‘홍안’, ‘홍소’, ‘감홍’, ‘섬머드림’)들의 자발휴면 타파에 필요한 저온요구도를 파악하고자 군위지역에서 4년(2009-2012년) 동안 조사하였다. 또한, 이들 자료를 이용하여 군위에서의 자발휴면 타파시기와 현재보다 기온이 4.0°C 상승되었을 때의 자발휴면 타파시기를 추정하였다. 휴면 개시점은 정단신초를 절단전정을 하였을 때 액아가 발아하지 않는 시기로 정하였다. 자발휴면 타파여부는 생장상에서 과대지의 정아가 15일 이내로 발아되었는가에 따라 결정하였다. 과대지는 매년 12월 초에 품종별로 약 100개씩 채취하여 5.0°C에 두고 1주일 간격으로 출고하여 생장상에 10개씩 배치하였다. 품종들의 저온요구도는 휴면 개시점부터 과대지들이 15일 내로 발아될 때까지의 노지 및 생장상에서 7.2°C 이하 및 0.0-7.2°C에서의 누적시간으로 표현하였다. 결과를 살펴보면, 조사품종의 휴면개시점은 9월 말로 추정되었다. 조사품종의 자발휴면 타파시기는 1월 말부터 2월 초 사이로 추정되었다. 각 품종별 자발휴면 타파에 필요한 7.2°C 이하의 누적시간은 1,600-2,000시간, 0.0-7.2°C 누적시간은 1,300-1,800시간이었다. 품종별 저온요구도 비교에 있어서는 개화가 빠른 품종의 저온요구도가 개화가 느린 품종보다 적은 경향이 있었다. 이상의 결과를 토대로 하여, 군위지역의 기온이 지금보다 4.0°C 정도 상승된다고 가정하면, 자발휴면 타파시기는 2-4주 정도 지연될 것으로 예측되었다. The study was carried out to examine the initial point of dormancy, breaking time of internal dormancy, and to find out the accumulated hours of low temperature (under 7.2°C from 0.0°C to 7.2°C) for bud-breaking. Over-all, the chilling requirement for breaking of internal dormancy in the commercial apple cultivars (‘Fuji’ and ‘Tsugaru’) and apple cultivars bred in Korea (‘Hongro’, ‘Sunhong’, ‘Honggeum’, ‘Hongan’, ‘Hongso’, ‘Gamhong’, ‘Summer dream’) at the Gunwi region for 4 years (from 2009 to 2012) was investigated. Also, the breaking time of internal dormancy in the field at the Gunwi region and the breaking time of dormancy if air temperature of Gunwi region rises 4°C higher than the current one were investigated using the same data. The initial point of dormancy was set at the time when the lateral bud breaking did not occurred (when heading back cutting was done in the middle of terminal shoots). The occurrence of the breaking of internal dormancy was decided if the breaking of the terminal bud of bourse shoot occurred within 15 days or not in growth chamber. About 100 bourse shoots were collected by cultivar classification in early December every year and were stored at 5.0°C, and they were placed in growth chamber at one week interval. The chilling requirement of cultivars was expressed in accumulated hours in the field and in the growth chamber under 7.2°C and 0.0-7.2°C from the initial point of dormancy to the breaking time of internal dormancy. The results showed that the initial point of dormancy in selected cultivars could occur at the end of September. The breaking time of internal dormancy could occur from the end of January to the early of February. The accumulated hours under 7.2°C for breaking of internal dormancy were 1,600-2,000 hours, while those of 0.0-7.2°C were 1,300-1,800 hours. In comparing the different apple cultivars, the chilling requirement of the early flowering cultivars seemed lower than that of the late-flowering cultivars. Based on these results, if the air temperature of Gunwi region rises about 4.0°C higher than the current one, the breaking time of internal dormancy will be delayed by 2-4 weeks.