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손정익 서울大學校 農業生命科學大學 農業開發硏究所 1997 서울대농학연구지 Vol.22 No.1
강우차단 효과를 고려한 개량형 비가림 시설의 효율성 평가를 위하여 관행형 및 개량형 시설의 환기량 및 실내온도 등의 환경해석 결과를 요약하면 다음과 같다. 1. 강우차단효과를 고려한 비가림 시설에 대한 환기모델을 구축하여 시설내 각 공간에서의 환기량을 계산할 수 있었다. 2. 풍속변화에 따른 환기량은, 개량형이 관행형보다 크게 나타났고, 풍속이 증가할수록 시설별 환기량도 증가하는 경향을 나타냈다. 3. 풍속변화에 따른 실내온도는 개량형이 관행형에 비하여 낮았고, 풍속이 증가할수록 시설별 온도차는 감소하는 경향을 나타냈다. 4. 측정치와 모델의 실내온도 비교 결과에 근거하여 개량형이 관행형보다 환기능력이 개선됨을 확인할 수 있었다. Rain shelters are very popular with farmers in summer regardless of their poor ventilation, since they can protect crops from being wet by the rain with only simple structures and accordingly increase the productivity of crops. For evaluating the ventilation performance of improved rain shelters, the ventilation rates and inside temperatures of one conventional and two improved rain shelters were compared by the model and the actual measurement at two different climatic regions. The ventilation model in which the inside space was subdivided into three parts considering the crops grown was developed, and the ventilation rate of each opening as well as the total ventilation rate were predicted by the model. The comparison of inside temperatures of each rain shelter, obtained by the theoretical model and the actual measurements as Suwon and Hoengge in Korea, proved that the ventilation performance of improved rain shelters was superior to that of conventional one.
水耕栽培시스템의 傅熱特性 및 養液冷却이 作物體溫에 미치는 效果
孫禎翼,金文基,南相運 서울대학교 농과대학 농업개발연구소 1992 서울대농학연구지 Vol.17 No.2
The purpose of this study was to make clear the heat transfer characteristics and effect of cooling the nutrient solution on the plant temperature during summer season in hydroponic culture system. Heat balance equations of plant and nutrient solution in hydroponic culture system were theoretically established and verified with experimental results. The following results were obtained. : 1) the conductive heat transfer through planting board and partitioning material occupied the most part of total heat transfer; more insulated and lower conductive material are required to reduce the cooling load of nutrient solution effectively. 2) plant temperature of leaf lettuce were dropped by 0.6℃(average) and l.5℃(maximum) with the nutrient solution cooling of 6℃, and by about 3℃ with sunlight shading of 50%; the successful hydroponic culture would be possible even during summer season, provided cooling the nutrient solution with simultaneous use of both ventilation and sunlight shading.
고품질 표고버섯 (Lentinus edodes(Berk.) Sing) 의 생육환경 분석
손정익 서울대학교 농업개발연구소 2000 농업생명과학연구 Vol.4 No.-
Oak mushroom(Lentinus edodes(Berk.) Sing) is one of the most important edible mushrooms, and its production has been rapidly increased due to nutritional and medicinal effects. In this study, regional climatic factors during the growing period of high-quality oak mushroom were analyzed and environmental condition affecting the quality were discussed. Three places as mass production areas of high-quality mushrooms and the 15 days as a standard growing period in 1997-1998 were selected. Major climatic factors were average air temperature and relative humidity, diurnal ranges of air temperature and relative humidity, and wind speed. During the period, the daily average air temperature was 5 to 15℃ with a diurnal range of -2~20℃ and the relative humidity was 40 to 60% with a diurnal range of 50~60%. Wind velocity was over 1 m/s. All the results showed that environmental conditions such as wide ranges of air temperature and relative humidity, low humidity, and wind speed affected the formation of high-quality oak mushroom. Moreover, the environmental conditions suitable for high quality differed from those for high productivity.
폐쇄 생태계 식물생산 개념에 근거한 도시형 식물공장에서의 CO₂이용 및 NO₂정화
손정익 서울대학교 농업개발연구소 1999 농업생명과학연구 Vol.3 No.-
The objectives of the study were to measure the absorption rate of NO2 concentration by lettuce and examine the physiological response, photosynthetic rate, respiration rate, and stomatal conductance of lettuce when the air contaminated in the human module was circulated by fan. The air in plant and human modules was circulated by diaphragm ON/OFF during 20/10 min, with maintaining each NO2 concentration at 0.13, 0.3, and 0.45μmolㆍmol-1 in the human module. The amounts of NO2 absorbed by lettuces in the plant module were 316.9, 875.9, 1074.2nmolㆍmol-1ㆍm-2ㆍ10min-1. The photosynthetic rate of lettuce measured at every 15:00hr for 5days was significant between zero and 450μmolㆍmol-1 of NO2 concentration in the human module(P<0.01). The absorption rate of NO2 was not significant at each CO2 concentration of 500, 1000, and 1500μmolㆍmol-1 but significantly higher at light intensity of 200 and 300μmolㆍm-2ㆍsec-1 than at 100μmolㆍm-2ㆍsec-1. The growth of lettuce had no difference between control and NO2 treated phase and showed good results in both. The CO2 generated from the human module can be used for plant growth, and the lettuce in the plant module could purify NO2 gas generated from the human module.
Jung Eek Son,Young Yeul Cho 한국원예학회 2005 Horticulture, Environment, and Biotechnology Vol.46 No.2
Since water-holding capacity of the perlite substrate is relatively low, the efficient moisture control in the substrate is required. In terms of the plant growth and irrigation efficiency, an adequate moisture content (MC) of the perlite substrate for hydroponically-grown tomato plants (Lycopersicon esculentum cv. Seokwang) was determined. Three MC levels of the substrate (12, 14, and 16%) were treated. As results, growth factors such as plant height, maximum leaf length and width, and shoot fresh and dry weights showed no significant differences. Average weight of marketable fruits subjected to different treatments showed no significant difference, whereas that of non-marketable fruits was the lowest under 16% MC. Total soluble solids were highest at 16% MC. The lowest MC improved fruit qualities by reducing the incidence of blossom-end rot, cracking, and deformity. To achieve the 1% increase in MC of 8-L perlite substrate per plant, at least 2 L per plant per day additional nutrient solution was required. That is, the water requirement became higher with the increase of the moisture level of the substrate. Thus, the adequate MC of the perlite substrate in a recycled soilless culture was 12% for achieving maximum growth and quality of tomato taking less supply of nutrient solution.
Jung Eek Son,Il Jang,Hyun Jun Park,Myung-Min Oh 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.2
A nutrient-circulated micropropagation system using a scaled-up vessel was developed for photoautotrophic micropropagation of potato plantlets. To verify usefulness of this system, potato (Solanum tuberosum L. cv. Dejima) plantlets were micropropagated under three different systems: nutrient-circulated photoautotrophic micropropagation system using a scaled-up vessel (PAS), photoautotrophic micropropagation using a magenta vessel (PAM), and photomixotrophic micropropagation using a magenta vessel (PMM). The growth of potato plantlets under PAS was significantly improved compared to those under PAM and PMM due to adequate CO₂ supply by forced ventilation and better root-zone environment conditions through circulated nutrient solution. This result on in vitro growth directly affected to survival rate and ex vitro growth. In addition, to determine proper ventilation rate in PAS, potato plantlets were grown under scaled-up vessels with different numbers of air exchanges (4, 7, 10, and 13 h<SUP>-1</SUP>). The number of air exchanges had an impact on relative humidity rather than CO₂ concentration in the vessels. Low relative humidity (70-80%) by high numbers of air exchanges (10, and 13 h<SUP>-1</SUP>) induced well-developed guard cells and wax deposition on the leaves of potato plantlets. Furthermore, high numbers of air exchanges (10, and 13 h<SUP>-1</SUP>) promoted in vitro growth and subsequently ex vitro growth after transplanting. Thus, it is concluded that PAS was suitable for the mass production of potato plantlets; also, to obtain vigorous growth of potato plantlets cultured in PAS, the number of air exchanges should be set at 10 h<SUP>-1</SUP> or over by forced ventilation.