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토양 환경 조건이 파 흑색썩음균핵병 발생에 미치는 영향
김용범(Yong-Bum Kim),최인후(In-Hu Choi),김철우(Cheol-Woo Kim),방진기(Jin-Ki Bang),김용기(Yong-Gi Kim) 한국원예학회 2009 원예과학기술지 Vol.27 No.2
본 연구는 우리나라 서남부지방의 파 주산지에서 문제되고 있는 파 흑색썩음균핵병의 효과적인 방제를 위하여 병원균의 생리ㆍ생태를 구명코자 수행하였다. 흑색썩음균핵병 발아시기는 평균온도가 25℃ 최저온도 20℃ 내외인 8월 하순부터 토양온도가 20℃ 미만으로 떨어지는 9월 하순으로 판단되었고, 파 재배 주산지의 흑색썩음균핵병 최초 발병시기는 10월 하순이고, 11월 상순부터 익년 3월까지 점차 발병이 증가되었다. 사질토양 지역인 신안 임자도에서는 12월 이전에 흑색썩음균핵병이 발병되었으며 다른 주산지에서는 발병이 없었다. 또한 발병포장의 토양수분함량에 따른 발병률과의 관계를 조사한 결과 논 재배에서는 발병이 거의 없는 것으로 알려져 있으나, 본 실험이 수행되었던 시험포장은 사질 토양으로 자연강우나 스프링클러를 이용한 관수가 발병억제에 효과가 적은 것으로 나타났다. 또한 피해주는 지상부의 엽 고사 정도가 높아 초장이 짧게 나타났고, 지하부 또한 건전주에 비해 뿌리 고사율이 47% 정도 높았다. 수확 후 토양 내 균핵의 분포를 조사한 결과 수직방향은 지표 10㎝ 이내에 97%, 수평방향은 기주로 부터 20㎝ 이내에 86%의 균핵이 분포한 것으로 나타났다. 흑색썩음균핵병 이병잔존물을 투입한 포장에서는 당년에 사양토사질토는 100%의 이병률을 보였고, 양토는 80%의 이병률을 보였으며, 다음해에는 57.6-78.7%로 이병률이 다소 감소되었으나 이병식물체의 재투입으로 인한 발병률은 높게 나타났다. This study was conducted to establish the effective strategy to control white rot (Sclerotium cepivorum) of welsh onion in the main cultivation region at the southwestern part of the Korean peninsula, from 2003 to 2005. White rot was affected by environment factors such as temperature and relative humidity. White rot pathogen germinated and grew from the end of August in the low soil temperature (20℃) and at average temperature of 25℃ to the middle of September dropping the soil temperature below 20℃. Generation of white rot in welsh onion fields increasing infection area began from the late of October and widely spread from the early September to the early May of the following year. White rot in welsh onion fields increasing infection area began from the late October and widely spread from the early September to the early May in the following year. The Imjado with sandy soil area occurred in white rot before December, but other regions were not infected throughout the whole cultivation period. On the correlation of water content with disease infection, either rain or irrigation with sprinkler to welsh onion fields of dry condition was not effective, but in the rice fields the correlation were nearly not affected. Infected plants were short plant height caused by dried leaves, and 47% of the roots in the root stem were dead. After harvesting, the sclerotia of white rot pathogen was remained at 86% within 20 ㎝ depth from the host plants of soil in infected plants and at 97% within 10 ㎝ from vertical directions. Infected plants with the sclerotia to put in welsh onion farm that infected at 100% in sandy soil; the others were 80% in loam soil. However, the infected rate decreased to 57.6~78.7% in the following year. The high infected rate was caused by the remaining of the onion waste in the field after harvesting.
마늘 생장점 조직배양 후 포장에서의 년차별 생육 및 수량특성 변화
권영석(Young-Seok Kwon),최인후(In-Hu Choi),김철우(Cheol-Woo Kim),최민선(Min-Seon Choi),곽정호(Jung-Ho Kwak),임용표(Yong-Pyo Lim) 충남대학교 농업과학연구소 2015 농업과학연구 Vol.42 No.4
In this research, we surveyed the yield change of garlic cultivation with seed bulbs according to annual field culture after induced meristem culture. From 2007 to 2013, yearly produced seed bulbs from 2<SUP>nd</SUP> to 8<SUP>th</SUP> generation were cultivated in the Muan field. Over the generations, the general growth characteristics such as the plant height, leaf number, leaf length and stem diameter were all decreased. When we compared the conventional seed bulbs and TCR ones, the plant height and stem diameter showed bigger difference. And the TCR seed bulbs showed a week late harvest time against the conventional ones. The yield of 2<SUP>nd</SUP> generation was 72.3 g and 57.1 g for the 8<SUP>th</SUP> generation. However every generation showed higher yield than conventional seed garlic’s ones as 43.9 g. The yield index showed the same trend as 2<SUP>nd</SUP>- 8<SUP>th</SUP> to 63% to 21%. After the tissue culture of garlics, the viral infections (OYDV and GSV) of TCR was far less than that of conventional ones. In case of LYSV, the infection ratio was 6.7% at 2<SUP>nd</SUP> generation and 26% at 8<SUP>th</SUP>. However, the ratio was far less than that (80%) of the conventional ones.
양파 정식시기별 서릿발 피해 방지 및 피해주 재이식 효과
권영석(Young-Seok Kwon),최인후(In-Hu Choi),김철우(Cheol-Woo Kim),최민선(Min-Seon Choi),곽정호(Jung-Ho Kwak),임용표(Yong-Pyo Lim) 충남대학교 농업과학연구소 2015 농업과학연구 Vol.42 No.4
In the year 2013, onions cultivation in Jeonnam province suffered by frost-pillar damage. To reveal the aspects of the cause and outbreak, we surveyed those damaged areas. Usually the frost-pillar damage occurred in February. But the outbreak aspect is so unforeseeable. In 2013, the damage was shown as 10.6% in onion fields including paddy fields, but no damage was noticed in 2014. The damage was noticed as 77.8% in paddy fields and 30.1% in upland. And, by the difference of the onion transplanting date, it occurred as 0.7% by the middle of November to the early of November, 22% by the middle of November and 69.0% by the early of December. If one performed the supplementary planting at 3<SUP>rd</SUP> week of February, the highest survival percent was observed as 53.3%. If the date is early, another frost-pillar damage was occurred. If it’s late, the damaged plant was perished with dry. In any case, we found improper transplanting caused the yield decrease. Therefore, we recommend the timely transplanting is the most important way for the prevention of frost-pillar damage in the onion cultivation.