• KOREAN JOURNAL OF CROP SCIENCE
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• v.24 no.2
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• pp.17-26
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• 1979

Comparative tolerance of the new rice varieties from Indicax Japonica cross to elastic and plastic chilling injuries was examined at the 3rd leaf-stage, the most sensitive stage to chilling during nursery, using a chilling chamber set 11\circ C, 13hrs. 20K lux day/5$^{\circ}C$ night. Seedlings were reared until 35 days after seeding in a 26\circ C, 13hrs. day / 18\circ C night chamber except the period of chilling treatment for 0, 3, 4, 6, 8 or 10 days. The new varieties were approximately twice susceptible to elastic injuries, and thrice susceptible to plastic injuries than the Japonica varieties in the term of chilling duration. Among the variables indicating apparant chilling injuries the reduction in dry matter responded most sensitively and differentiated well the varietal difference in chilling resistance even with shorter chilling period. Sequential aspects of the cause and effect relations involved in the development of the apparant chilling injuries are discussed and a schematic diagram is presented as Fig. 5 in the text.

• Current Research on Agriculture and Life Sciences
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• v.20
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• pp.71-76
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• 2002

The one year old persimmon twigs were collected to know cold tolerance at different temperatures. The selected persimmon cultivar were mast commonly growing in southern part of Korea, such as Bong-Ok, Chungdo-Bansi, Naju-Pasi and Kiwonbang growing at attached farm of Kyungpook Nat. Univ. Browning of bud was the most significant at $-15^{\circ}C$. Naju-Pasi showed no difference in damage between $-5^{\circ}C$ and $-15^{\circ}C$ so called, it is cold tolerant cultivar. Browning of the woody part showed the same tendency with the bud at $-15^{\circ}C$. Chungdo-Bansi was shown the mast weak in cold tolerance than the other cultivars. Electric conductivity was higher at $-15^{\circ}C$ in all persimmon cultivars. Naju-Pasi and Bong-Ok cultivars were weak in cold tolerance even at $-10^{\circ}C$. Bud bursting was occurred at $-15^{\circ}C$ but few on another twigs tested. Naju-Pasi was the lowest while Kiwonbang was higher in the bud bursting. From these result, Naju-Pasi and Bong-ok cultivars were lower in cold tolerance. Kiwonbang cultivar was shown cold tolerance than the other cultivars. These results can be utilized for the persimmon cultivation at different localities in future.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.40 no.6
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• pp.705-710
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• 1995

In order to find out the effect of rainfall at harvesting season on germination of malting barley, the seeds sampled from Cheju island and southern part of Korea were examined. The germination rate of seeds from Cheju island where rainfall was frequent at harvesting season, ranged from 46 to 71%, even though disease infection of the seeds was not that serious as would be expected. High sugar content of seed was resulted from the degradation of carbohydrates during the harvest season. From TZ test the rainfall - affected seeds were found to be highly viable but in the state of secondary dormancy. Results of cold germination test showed that the seeds were recovered from the secondary dormancy. Therefore, it was recommended that the seeds affected by the rainfall at harvesting season should be utilized after 12 months when the dormancy period terminated. The germination percent of the seeds was significantly enhanced by prechilling and / or 1 ppm gibberellic acid treatment. Different seed lots showed different rate of germination and the degree of dormancy.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2018.10a
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• pp.213-213
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• 2018

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
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• 2018.06a
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• pp.101-102
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• 2018

• Research in Plant Disease
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• v.10 no.1
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• pp.1-7
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• 2004

The year of 2003 was characterized as a cool humid year. Low temperature and frequent rains were continued during March to July, resulting in 1.6 times higher rainfalls and 32％ less sunshine period compared to the average yean Due to 2003's climatic condition, rice blast, and bacterial leaf blight occurred severely. Higher rainfalls caused severe epidemic of phytophthora disease and, in case of red-pepper, 55％ of cultivation acreage was devastated by the disease over the country. Besides, crop diseases which become severe under cool-humid conditions, such as gray mold, sclerotinia rot, downy mildew, increased significantly compared to the previous year. In fruit trees, brown spot of apple, and pear scab occurred severely causing much yield loss.

• KOREAN POULTRY JOURNAL
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• v.40 no.8
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• pp.140-142
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• 2008

여름은 고온다습하고 겨울은 저온저습한 계절 특성이 뚜렷한 우리나라의 기후 조건에서는 겨울은 겨울대로 여름은 여름대로 생산성을 유지하기가 무척 어려운 것이 사실이다. 혹서기를 지내면서 어찌할 수 없는 더위로 속수무책 피해를 겪은 농장들은 점점 가속화 되는 폭염으로 걱정이 커져가기만 한다. 이에 대비하기 위해 많은 농가들이 시설과 사육환경 개선에 심혈을 기울이고 있다. 일반적으로 8월은 중순까지 더위가 이어지고, 그 이후로는 아침.저녁으로 선선한 바람이 불기 시작하다가 8월 말이 되면 더위가 가고 가을을 맞게 되는 시기이다. 절기는 계절의 변화를 거의 정확하게 반영한다. 8월 7일이 입추(立秋, 가을의 시작)이고, 23일이 처서(處暑, 더위가 가고 일교차가 커짐)인 것을 감안하면 이제 머지않아 더위가 마감되고 서늘한 가을로 들어서게 될 것이다. 더위에 지친 계군을 잘 관리하여 생산성 극대화를 위한 중점관리를 시작해야 할 시기가 바로 이 때이다. 또 환절기 및 혹한기에 대비한 질병관리로 뜻하지 않게 질병이 발생하여 생산성 저하를 겪는 일이 없도록 만전을 기해야 할 때이기도 하다. 근래 국내 양계질병의 발생양상은 연중 그 피해의 범위가 확대되고 있는 실정이다. 이것은 질병 다발시기에 그 질병으로 인한 피해정도가 점점 심해질 것임을 의미하는 것이기도 하다. 연중 어느 때도 계군관리에 있어 중요하지 않은 시기가 없겠으나 더위를 겪은 계군의 체력을 회복시키고 다가올 환절기와 혹한기를 대비하여 철저한 관리가 필요한 때이다.

• Journal of the Korean Institute of Landscape Architecture
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• v.40 no.6
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• pp.173-179
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• 2012

The experiments, which analyze the injury symptoms and diagnose growth conditions utilizing IRVT and analyzing each parts of H. helix L., had been held under a low temperature. Greenhouse and outdoor growing Genus hedera had been prepared and compared with each Genus hedera's peak and bottom leaves' surface temperature under the experimental categories $-6^{\circ}C$ and $-12^{\circ}C$. As results, analyzing the surface thermal property of peak part leaves' of outdoor growing Genus hedera, at experimental categories $-6^{\circ}C$, $-12^{\circ}C$ were ranged from $-2^{\circ}C{\sim}-7^{\circ}C$ and $-2^{\circ}C{\sim}-15^{\circ}C$. On the other hand, the surface thermal property of bottom part leaves at experimental categories $-6^{\circ}C$, $-12^{\circ}C$ were ranged $-2^{\circ}C{\sim}-11^{\circ}C$ and $-1^{\circ}C{\sim}-12^{\circ}C$. It appears that the thermal properties of leaves' surface on $-6^{\circ}C$ peaks and $-12^{\circ}C$ bottoms were more broadband than bottoms and peaks. It means that the peaks were more sensitive than bottoms, as like $-2^{\circ}C{\sim}-15^{\circ}C$, $-1{\sim}-12^{\circ}C$. Moreover, as similar results had seen to leaves surface temperature added to cold wind conditions. How the cold wind damaged the outdoor growing Genus hedera, analyzed the surface thermal property by IRVT data under $0^{\circ}C$, $-2^{\circ}C$, $-4^{\circ}C$ condition, it resulted to $-6.2^{\circ}C$, $-6.8^{\circ}C$, $-7.5^{\circ}C$. It appeared more $3.5{\sim}6.2^{\circ}C$ low temperature than experimental setting point. In addition, each parts thurmal property of peaks and bottoms was not similar, it referred to each parts' sensitivities of low temperature were different on the peak and bottom leaves surface temperature.

• 보존과학연구
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• s.34
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• pp.84-99
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• 2013

There are more than 2,900 different species of termites in the world, and just there are 23 species in Japan. They caused more severe infestation compared with Korea. When a structure has become infested with termites, it is important that appropriate action must be taken: the chemical pest control (fumigation, soil termiticide treatment, bait system etc.) or the non-chemical pest control (low oxygen treatment, carbon dioxide treatment, high/low temperature treatment etc.). Especially, there were attempts to make practical protocol of various alternatives since the fumigant(methyl bromide) had been phased out in 2005 in Japan, and practically non-chemical methods would be effective alternatives for some cases, where the scale of infestation is small and limited and when long treatment is possible. But most of all, it is important that the process of pest control is made according to each species of termites with consideration for different characteristics of termites.

• Journal of Korean Society of Forest Science
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• v.28 no.1
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• pp.31-35
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• 1975

The present study explored the rapid effect of low temperature on the freezing resistance of dehardening twigs of three apple cultivars and sweet cherry. The effect of low temperature was depending upon the thawing treatment following to the low temperature treatment. When the freezing temperature to $-9^{\circ}C$ for three hours followed by thawing treatment ($5^{\circ}C$) was given repeatedly twice, the low temperature increased apparently the cold hardiness of apple and cherry by 3 to $9^{\circ}C$. On the other hand, when the freezing temperature ($-9^{\circ}C$) for ten hours was pretreated without thawing, the low temperature appeared not affecting the cold resistance of the twigs. The role of freezing-thawing temperature cycle in nature was discussed as a signal of environmental stimulus to which dehardening plant may be responding to increase their cold hardiness so as to adapt against the damage of late frost in early spring.