• Title/Summary/Keyword: greenhouse horticulture

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Effect of Cold Treatment for Mother Plants of New Strawberry Cultivars Bred in Korea on the Production of Runners and Daughter Plants (국내 육성 신품종 딸기의 모주 저온처리가 런너와 자묘의 발생에 미치는 영향)

  • Jun, Ha Jun;Jun, Eui Hwan;Kang, Su In;Bae, Keun Hye
    • Journal of Bio-Environment Control
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    • v.24 no.1
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    • pp.8-12
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    • 2015
  • There are various limiting factors that take part in the production of daughter plants, but the important thing for mother plants of strawberries is to undergo a sufficient period of dormancy during winter. It is a well known fact that many runners and daughter plants are generated from mother plants that have been through sufficient cold treatment, but such researches were not found in Korea. This experiment was conducted due to the recent need for a research on the effects of cold treatment using 'Seolhyang,' 'Maehyang' and 'Ssanta' cultivars bred in Korea for two years in 2012 and 2013. The strawberries were divided into 4 types treatments: cold treatment plants in which 1,000 hours have passed in the temperature of $5^{\circ}C$ and below; cold+heated treatment plants in which 1,000 hours have passed in the temperature of $5^{\circ}C$ and below, and then 2 weeks in the greenhouse; greenhouse treatment plants raised in the greenhouse; and plants in harvest treatment. The results of the 2012 experiment showed that 'Seolhyang' had the bigger number of daughter plants in the cold, cold+heated, and harvest than greenhouse. 'Maehyang' had the biggest number of daughter plants in the cold+heated, and lowest in the greenhouse and harvest. 'Ssanta' had no significant difference in all treatments. The results of the 2013 experiment showed that 'Seolhyang' and 'Maehyang' both had more daughter plants in cold and cold+heated than in the greenhouse and harvest. 'Ssanta' tended to show a similar result and cold+heated had statistically more daughter plants than greenhouse.

Study on the performance analysis of long-term field test for protected horticulture heating system using solar thermal energy (태양열 시설원예 난방시스템 장기실증 성능분석 연구)

  • Lee Sang-Nam;Kang Yong-Heack;Yu Chang-Kyun;Kim Jin-Soo
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.06a
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    • pp.403-407
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    • 2005
  • Objective of the research is to demonstrate solar thermal space and ground heating system which is integrated to a greenhouse culture facility for reducing heating cost, increasing the value of product by environment control, and developing advanced culture technology by deploying solar thermal system. Field test for the demonstration was carried out in horticulture complex in Jeju Island. Medium scale solar hot water system was installed in a ground heating culture facility. Reliability and economic aspect of the system which was operated complementary with thermal storage and solar hot water generation were analyzed by investigating collector efficiency, operation performance, and control features. Short term day test on element performance and Long term test of the whole system were carried out. Optimum operating condition and its characteristics were closely investigated by changing the control condition based on the temperature difference which is the most important operating parameter. For establishing more reliable and optimal design data regarding system scale and operation condition, continuous operation and monitoring on the system need to be further carried out. However, it is expected that, in high-insolation areas where large-scale ground storage is adaptable, solar system demonstrated in the research could be economically competitive and promisingly disseminate over various application areas.

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Change of Internal Temperature and Humidity According to Kind of Covering Materials in Sweet Pepper's Greenhouse (착색단고추 재배 온실의 피복재 종류에 따른 내부 온.습도 변화)

  • Kim, Ho-Cheol;Choi, Jun-Hyuk;Lee, Soo-Won;Lee, Jeong-Hyun;Bae, Jong-Hyang
    • Journal of Bio-Environment Control
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    • v.19 no.1
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    • pp.1-5
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    • 2010
  • This research was conducted to investigate difference of internal temperature, humidity, and plant growth according to covering materials in sweet pepper's greenhouse. For growing period, daily mean internal temperature was not different between glass (GH) and plastic film house (PH), but the changed volume was more PH than GH. Internal humidity deficit was more PH than GH as that was 4.3 $g{\cdot}m^{-2}$ and 5.6 $g{\cdot}m^{-2}$, respectively. In change of internal temperature effected by different intensity of external light, that of PH was fasted twice that of GH, and that's tendency was effected by difference of internal temperature for several hours after sunrise. Leaf growth and photosynthetic product were more GH than PH, productivity of GH was better 80 percents than PH. As results, To improve productivity in PH compared with productivity in GH need to be the detailed managements of internal environmental factors in early period after sunrise.

A Study on the Control of the Temperature and Relative Humidity in Greenhouse by Adjusting the Amount of Natural Ventilation and Fog Spray Quantity (자연환기량과 포그분무량 조절에 의한 온실 온습도의 동시제어 기법 연구)

  • Kim, Youngbok;Sung, Hyunsoo;Hwang, Seungjae;Kim, Hyeontae;Ryu, Chanseok
    • Journal of the Korean Solar Energy Society
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    • v.36 no.5
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    • pp.31-50
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    • 2016
  • To develope a greenhouse fog cooling system to control the temperature and relative humidity simultaneously to the target value, a theoretical analysis and experiments were done. The control process includes the measuring of environmental variables, setting and coding of the water and heat balance equations to maintain the target temperature and relative humidity in greenhouse, calculating of the open level of the greenhouse roof window that governs the natural ventilation and spray water quantity, and operating of the motor to open/close the roof window and pump to spray for water. The study results were shown to be very good because the average air temperature in the greenhouse was kept to be about $28.2^{\circ}C$ with the standard deviation of about $0.37^{\circ}C$ compared to the target temperature of $28^{\circ}C$ and the average relative humidity was about 75.2% compared to the target relative humidity was 75% during the experiments. The average outside relative humidity was about 41.0% and the average outside temperature was $27.2^{\circ}C$ with the standard deviation of about $0.54^{\circ}C$. The average solar intensity in the greenhouse was 712.9 W. The wind velocity of outside greenhouse was 0.558 m/s with the standard deviation of 0.46 m/s.

Comparison of Heat Insulation Characteristics of Multi-layer Thermal Screen and Development of Curtain System (다겹보온자재의 보온성 비교 및 커튼개폐장치 개발)

  • Lee, Si-Young;Kim, Hark-Joo;Chun, Hee;Yum, Sung-Hyun;Lee, Hyun-Joo
    • Journal of Bio-Environment Control
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    • v.16 no.2
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    • pp.89-95
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    • 2007
  • This study was accomplished to compare energy saving effects of several heat insulation materials in greenhouse and to develop new automatic opening and closing equipment which is suitable to the most effective heat insulation material. To find out more effective heat insulation material, the magnitude of heat transfer occurred through aluminum screen (ALS), non-woven fabric (NWF), double-layer aluminum screen with chemical cotton sheet (DAL), and multi-layer fabric screen material quilted with non-woven fabric, chemical cotton, poly foam, and polypropylene (MLF) were compared relatively. The results showed that the relative magnitude of heat transfer occurred through MLF was lower than DAL and ALS by 23.3% and 43.0% respectively. MLF screen material was the most effective compared with other heat insulation materials. But because of thickness, there was a need of new mechanism for automatic operation in greenhouse. Accordingly, new screen system using MLF-thick but profitable for keeping warm in greenhouse-was developed. Opening & closing equipment was designed to roll MLF with pipe axis during opening process and pull MLF with string during closing process with electric motors, clutches, drums, and so on. In hot pepper cultivation and energy saving test during winter time, the early stage yield of pepper under MLF screen system was higher than NWF by 27%, and gasoline consumption of MLF screen system was lower than NWF by 46%.

Analysis of Relationship between Tomato Growth, Vital Response, and Plant-induced Electrical Signal in a Plastic Greenhouse due to Carbon Dioxide Enrichment Treatment (플라스틱 온실 내 이산화탄소 시비에 따른 토마토 생육과 생체 반응 및 Plant-induced Electrical Signal 간 관계 분석)

  • Hee Woong Goo;Gyu Won Lee;Wook Jin Song;Do Hyeon Kim;Hyun Jun Park;Kyoung Sub Park
    • Journal of Bio-Environment Control
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    • v.32 no.4
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    • pp.484-491
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    • 2023
  • Tomatoes in greenhouse are a widely cultivated horticultural crop worldwide, accounting for high production and production value. When greenhouse ventilation is minimized during low temperature periods, CO2 enrichment is often used to increase tomato photosynthetic rate and yield. Plant-induced electrical signal (PIES) can be used as a technology to monitor changes in the biological response of crops due to environmental changes by using the principle of measuring the resistance value, or impedance, within the crop. This study was conducted to investigate the relationship between tomato growth data, vital response, and PIES resulting from CO2 enrichment in greenhouse tomatoes. The growth of tomato treated with CO2 enrichment in the morning was significantly better in all items except stem diameter compared to the control, and PIES values were also higher. The growth of tomato continuously applied with CO2 was better in the treatment groups than control, and there was no significant difference in chlorophyll fluorescence and photosynthesis. However, PIES and SPAD values were higher in the CO2 treatment group than control. CO2 enrichment have a direct relationship with PIES, growth increased, and transpiration increased due to the increased leaf area, resulting in increased water absorption, which appears to be reflected in PIES, which measures vascular impedance. Through this, this study suggests that PIES can be used to monitor crops due to environmental changes, and that PIES is a useful method for non-destructively and continuously monitoring changes of crops.

Folate Contents of Oriental Melon (Cucumis melo) Cultivated in Greenhouse Covered with Different Films and Varieties (시설 피복자재와 품종에 따른 참외 엽산 함량)

  • Chun, Hee;Choi, Yeung-Ha;Um, Yeong-Cheol;Paek, Y;Yu, In-Ho;You, Hee-Yong;Hyun, Tai-Sun;Yon, Mi-Yong;Shin, Yong-Seub
    • Journal of Bio-Environment Control
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    • v.17 no.1
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    • pp.32-37
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    • 2008
  • Light transmittance of PO-2 film was 71.2% higher than any other films, because of low amount of pending water and attaching dust on film surface. On dawn, the air temperature of tunnel were higher than that of outdoors as much as between 11.8 and $14.5^{\circ}C$ on Feb. 19 to 20, 2007. The air temperature in the greenhouse covered with PO-2 film was higher than any other films as much as $2.3^{\circ}C$. Analyzing of folate in oriental melon, the folate contents of fruit were between 68.9 and $113.4\;{\mu}g/100\;g$ according to varieties. In winter, the folate contents in the treatment of PO-2 film was higher than that in the treatment of PE film as much as 17%. Above $15^{\circ}C$ in outdoors mean air temperature, the folate contents were as much as between 55.2 and $75.2\;{\mu}g/100\;g$. The folate contents in the treatment of PO-2 film was higher than that in the treatment of PE film as much as 36%.

Production of transgenic potato exhibiting enhanced resistance to fungal infections and herbicide applications

  • Khan, Raham Sher;Sjahril, Rinaldi;Nakamura, Ikuo;Mii, Masahiro
    • Plant Biotechnology Reports
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    • v.2 no.1
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    • pp.13-20
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    • 2008
  • Potato (Solanum tuberosum L.), one of the most important food crops, is susceptible to a number of devastating fungal pathogens in addition to bacterial and other pathogens. Producing disease-resistant cultivars has been an effective and useful strategy to combat the attack of pathogens. Potato was transformed with Agrobacterium tumefaciens strain EHA101 harboring chitinase, (ChiC) isolated from Streptomyces griseus strain HUT 6037 and bialaphos resistance (bar) genes in a binary plasmid vector, pEKH1. Polymerase chain reaction (PCR) analysis revealed that the ChiC and bar genes are integrated into the genome of transgenic plants. Different insertion sites of the transgenes (one to six sites for ChiC and three to seven for bar) were indicated by Southern blot analysis of genomic DNA from the transgenic plants. Expression of the ChiC gene at the messenger RNA (mRNA) level was confirmed by Northern blot analysis and that of the bar gene by herbicide resistance assay. The results obviously confirmed that the ChiC and bar genes are successfully integrated and expressed into the genome, resulting in the production of bialaphos-resistant transgenic plants. Disease-resistance assay of the in vitro and greenhouse-grown transgenic plants demonstrated enhanced resistance against the fungal pathogen Alternaria solani (causal agent of early blight).

Effect of CO2 Supply on Lettuce Growth

  • Hyeon-Do Kim;Yeon-Ju Choi;Eun-Young Bae;Jum-Soon Kang
    • Journal of Environmental Science International
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    • v.33 no.6
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    • pp.355-365
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    • 2024
  • This study was conducted to investigate the effects of CO2 supplement on growth and quality in greenhouse lettuce cultivation. When CO2 was supplied at 1,500 ppm in lettuce cultivation, overall growth parameters such as number of leaves, leaf area, plant length, fresh weight, and dry weight were superior compared to those of the control group. While there was no significant difference in relative growth rate due to CO2 supplement, an increase in leaf area index was observed with CO2 usage. Furthermore, although there was no significant difference in the content of water-soluble vitamins such as Vitamin C, B1, B2, B5, and B6 due to CO2 supplement, the Vitamin B3 content in the CO2 treatment group was 0.5 mg/kg higher than in the control group. Therefore, the use of CO2 in lettuce cultivation resulted in increased yield and promoted growth, enabling early harvesting.

A New Gymnocalycium mihanovichii 'Gohong' with Bright Red Color (밝은 진적색 비모란 선인장 '고홍' 육성)

  • Park, Pil Man;Jeong, Myeung Il;Kim, Young Jin;Kim, Won Hee;Lee, Eun Kyung;Kim, Seung Tae;Yoo, Bong Sik
    • FLOWER RESEARCH JOURNAL
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    • v.17 no.3
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    • pp.197-200
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    • 2009
  • A new grafted cactus cultivar, G. 'Gohong', was developed by crossing 'DR' line with dark red color and G. 'Seolhong' with dark red color in 2004. It grew for 6 months after grafting in vitro and culturing at 100 mL test tube. After grafting and planting in greenhouse in 2005, various characteristics were evaluated three times until 2008. It has flat-round shape and dark red skin. In addition, it has 8 to 10 ribs and gray and straight spines on the body. The diameter of it was 44.1 mm after 10 months. It grew bigger and faster comparing with G 'Seolhong' cultivar. The ability of propagation in G. 'Gohong' is similar to that of G. 'Seolhong' producing approximately 12.1 daughter globes for 10 months after planting.