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변일수,서선영,정종배 한국토양비료학회 2012 한국토양비료학회지 Vol.45 No.1
Blossom-end rot is probably the most recognizable Ca deficiency that affects fruit production including pepper. We investigated the induction of blossom-end rot during the period of rapid vegetative growth and fruit setting, and the effect of Ca fertilization on the suppression of blossom-end rot in pepper plants grown in a plastic-film house. During the first fruit setting period, more than 60% of pepper fruits larger than 8 cm showed the symptoms of blossom-end rot. Under the condition of transpiration occurring at a much faster rate,growing leaves of pepper plants could be the greater sinks for Ca than developing fruits. The incidence of blossom-end rot was significantly decreased after two weeks of Ca fertigation. Calcium application during the rapid vegetative growth and fruit setting period could be suggested as a preventive step to overcome the local Ca deficiency inducing blossom-end rot of pepper fruits.
이모작에 따른 참외 재배 비닐하우스 토양의 선충밀도 변화
변일수 ( Il Su Byeon ),서선영 ( Sun Young Suh ),이용세 ( Yong Se Lee ),정종배 ( Jong Bae Chung ) 한국환경농학회 2014 한국환경농학회지 Vol.33 No.1
BACKGROUND: Crop rotation is often used as a solution to eradicate nematodes in soils used in plastic film houses for long-term cultivation of oriental melon. However, it is not clear if the double-cropping is effective in reducing nematode populations in soils. METHODS AND RESULTS: Nematode population in plastic film house soil was measured during oriental melon cultivation from April to July in short term crop rotation systems of oriental melon. Double-cropping of chinese cabbage in open-field for 3-4 months following oriental melon in plastic film houses could not prevent the build-up of high population density of nematodes. However, double-cropping of dropwort in flooded soil for 3-4 months following oriental melon in plastic film houses could effectively reduce the nematode population during the successive year of oriental melon cultivation. The reduced nematode population in soils of oriental melon-dropwort double-cropping system was continued until the mid season of progressive year oriental melon cultivation. Application of nematicide to soil before growing oriental melon in the oriental melon-dropwort double-cropping was very effective in preventing the build-up of high population density of nematode in plastic film house soils. CONCLUSION: Short-term introduction of crop rotation was not effective in suppression of high population density of nematodes in plastic film house soils of long-term year-to-year production of oriental melon. For securing the soil productivity and sustainability of plastic film house, various physical, chemical, and agronomic practices should be properly combined together.
휴경기 후작물 재배에 의한 참외 장기연작 비닐하우스 토양의 제염 효과
변일수 ( Il Su Byeon ),정종배 ( Jong Bae Chung ) 한국환경농학회 2015 한국환경농학회지 Vol.34 No.4
BACKGROUND: During the off-season, the cultivation of Chinese cabbage and water dropwort is often used to desalinize plastic film house soils. The objective of this study was to verify the effect of double-cropping systems on the salt removal in oriental melon cultivated plastic film house soils.METHODS AND RESULTS: Electrical conductivity (EC)and soluble salt contents were measured in soils collected from plastic film houses of oriental melon cultivation before and after the off-season crop cultivation. Also the same measurements were performed in the next oriental melon season to estimate the desalinization effect of double-cropping systems. During the cultivation of Chinese cabbage under open-field condition, ECe of surface soil was reduced from 6.0 to 0.8 dS/m. Double-cropping of water dropwort in flooded soil was also efficient in removing the salts accumulated during oriental melon cultivation. In the house soils where salts were removed during the off-season crop cultivation, soil ECe was maintained below 3 dS/m during the next oriental melon cultivation season.CONCLUSION: The off-season cropping under open-field or flooded condition was effective in desalinization of plastic film house soils. Since the salt removal effect is not expected to last for several years, the double-cropping system should be introduced every season to maintain soil EC below the critical level.
비동기 에이전트 복제를 이용한 효율적인 이동 에이전트 복구 기법
변일수(Ilsoo Byun),강수석(Sooseok Kang),박태순(Taesoon Park) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1A
신뢰할 만한 이동 에이전트 시스템을 구축하기 위해서는 이동 에이전트의 결함 내성 기능이 중요하다. 지금까지 여러 결함 내성 기법이 제안되었는데, 그 중의 하나가 에이전트 복제 기법이다. 에이전트 복제는 검사점 기법에 비해 훨씬 나은 신뢰성을 제공하는 반면, 복제 에이전트의 이동과 동의 과정에 수반되는 부하가 시스템의 성능을 저하시킨다. 그러므로 본 논문에서는 비동기 에이전트 복제 기법을 제안한다. 이 기법에서는 에이전트를 비동기적으로 전송하며 동의 과정을 위해 뒤늦게 전송되는 복제 에이전트를 기다리는 것이 아니라 고정된 동의 전용 에이전트를 사용하여 동의 과정의 비용을 감소시킨다. 제안된 기법은 Aglet 시스템 상에 구현되었으면, 실험 결과 제안된 기법을 사용할 경우 35%-69%의 성능 향상을 얻을 수 있었다.
서선영,변일수,이용세,정종배 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.4
Nitrogen dioxide (NO2) gas damage on vegetable crops commonly occurs in plastic film houses where relatively large amounts of NO3- are applied in acid soils. In acid soils, HNO2 can be formed from the NO2- accumulated during denitrification, and NO2 can be evolved from the chemical self-decomposition of HNO2. In this study, NO2 gas production and its detrimental effects on plants were investigated in soils of various conditions to elucidate the mechanisms involved in the gas production. A silty loam soil was amended with NO3- (500 mg N kg-1) and glucose, and pH and moisture of the soil were adjusted respectively to 5.0 and 34.6% water holding capacity (WHC) with 0.01 M phosphate buffer. The soil was placed in a 0.5-L glass jar with strawberry leaf or NO2 gas absorption badge in air space of the jar, and the jar was incubated at 30oC. After 4-5 days of incubation, dark burning was observed along the outside edge of strawberry leaf and NO2 production was confirmed in the air space of jar. However, when the soil was sterilized, NO2 emission was minimal and any visible damage was not found in strawberry leaf. In the soil where water or NO3- content was reduced to 17.3% WHC or 250 mg N kg-1, NO2 production was greatly reduced and toxicity symptom was not found in strawberry leaf. Also in the soil where glucose was not amended, NO2 production was significantly reduced. In soil with pH of 6.5, NO2 was evolved to the level causing damage to strawberry leaf when the soil conditions were favorable for denitrification. However, compared to the soil of pH 5.0, the NO2 production and its damage to plants were much less serious in pH 6.5. Therefore, the production of NO2 damaging plants might be occurred in acid soils when the conditions are favorable for denitrification.