• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1996.06c
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• pp.1081-1089
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• 1996

In Korean agriculture, an automatic environment control system for greenhouse is essential to save labor and to increase the quality of products. The existing environment monitoring systems have weighed on greenhouse growers and researchers because of their high cost and difficult applications. Many sensors are widely used for monitoring the greenhouse environment, but most of commercial sensors are expensive and not suitable for use in greenhouses. Thus , the development of an environment monitoring system for exclusive use in greenhouses is essential . The objective of this study was to develop modular environment monitoring systems, which are low-cost , reliable and easy -to -use. The results showed that the sensors for indoor and outdoor environments and nutrient solution had the ranges and accuracies appropriate for use in greenhouses. Also the modular environment systems developed showed a satisfactory performance in terms of stability and reliability in the measurement and acquisition of the greenhouse environment data.

• Journal of Plant Biology
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• v.27 no.4
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• pp.253-261
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• 1984

Leaf discs isolated from the pea seedling grown in nutrient solution containing 5mM ammonia or nitrate exhibited a half level of photorespiration as compared with the nitrogen free control. The manifestation of the ammonia effect appeared somewhat earlier than that of nitrate effect, but this difference subsided as the culture periods was extended. The total amount of ${CO}_2$ fixed by leaves from nitrogen-supplemented seedlings showed approximately 1.5 fold increase over the control with the ammonia effect being manifested earlier than the nitrate effect. The activities of peroxisomal serine: glyoxylate aminotransferase were always higher with ammonia than nitrate, the two types of nitrogen source, however, had similar effect on conversion rate of glyoxylate into glycine. These results indicate that exogenous ammonia does not act directly as an effector of this aminotransferase in vivo. But changes in the level of the pool size of glycine and serine, both of which are the intermediates of photorespiratory process, suggest that exogenous ammonia inhibit the transformation of serine from glycine metabolically.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1999.11a
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• pp.141-144
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• 1999

1970년대에 덴마크에서 원예용 배지로 암면을 사용한 이래 현재 암면은 채소 및 화훼류 양액재배에 있어서 가장 중요한 배지의 하나로 여겨지고 있다(Smith. 1996). 그러나, 이는 주로 판상암면을 의미하는 것으로 이와는 다른 형태인 입상암면은 고려되고 있지 않다. 입상암면은 판상암면과는 달리 입자형태를 하고 있기 때문에 판상암면보다 더 많은 공극을 확보할 수 있으며, 또한 입자내부에는 기존의판상암면과 같은 보습성을 지니고 있기 때문에 새로운 원예용 배지로서 대두되고 있다(Smith. 1996). (중략)

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1999.11a
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• pp.157-160
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• 1999

토양양액재배의 역사는 국내에서 '95년 이후 일부 시험기관에서 시험되었으며 일본과 이스라엘의 경우 꾸준히 연구가 수행되어 지금은 상당한 수준에 이르고 있다(이, 1999 ; 서, 1999 ; 임, 1998). 일본에서는 양액토경재배가 강부(1994)에 의해서 그 기술이 연구되고 또한 일부 회사에서 저단가로 실용적인 시스템과 전용액비를 개발하여 보급하고 있다. 절화국의 경우에는 EC 1.0과 EC 1.5dS/m 처리구에서 생장과 품질이 양호하였으며 EC 2.0과 EC 2.5dS/m 처리구에서 생육 후반기 염류장해로 인한 뿌리 손상이 발견되었으며 초장과 품질이 저하하였다. (중략)

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1994.11a
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• pp.74-75
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• 1994

양액재배에서 고려해야할 문제는 근권의 환경관리인데, 그 중에서도 가장 중요한 문제는 배양액의 관리이다. 배양액의 관리는 재배환경 및 작물의 생육단계에 따라서 달리해야 하는데, 현재 농가에서의 배양액관리는 재배경험이 일천한데다 사용하는 배양액에 따른 생장과 발육반응에 대한 결과가 미흡하다. 이런 측면에서 토마토의 분무경재배시 일반적으로 가장 많이 사용하는 배양액조성들이 방울토마토의 생장과 과실생장에 미치는 작용을 살펴보고, 방울토마토 양액재배시 성공적인 배양액관리를 위한 기초자료로 활용하고자 본 실험을 수행하였다. (중략)

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1994.11a
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• pp.86-87
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• 1994

토마토과실은 ripening 도중에 연화가 되며 수확후 운반이나 저장중에 물리적인 상처, 부패때문에 연화가 심화되어 많은 손실을 가져온다. 연화란 세포벽의 구조적 붕괴에 기인하며 이중 pectin의 분해와 밀접한 관계가 있다고 한다. Pectin에는 세포내 Ca함량의 대부분이 존재하며 Ca은 세포벽의 구조를 지지하는데 중요한 역할을 한다고 알려져 있다. 따라서 작물재배시 Ca 이온을 효과적으로 사용, 과실내의 Ca함량이 증가된다면 조직의 경도가 향상되어 과실의 저장력 뿐만 아니라 모식물체에서 보다 더 숙성된 과실을 수확, 유통 할수 있다. (중략)

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1994.11a
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• pp.84-85
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• 1994

과실의 연화는 주로 조직의 세포벽의 구조적 붕괴에 기인하며 이 중 Pectin의 분해와 밀접한 관련이 있다고 한다. 과실의 세포벽에는 다량의 $Ca^{2+}$이 존재하면서 세포벽의 구조를 지지하는데 중요한 역할을 하고있다. 양액 재배시에는 배양액의 농도가 높을수록 $Ca^{2+}$ 흡수이동이 억제되어 토마토식물체의 $Ca^{2+}$ 함량은 감소하는 것으로 보고되었다. 본 실험은 $Ca^{2+}$을 이용한 토마토과실의 품질향상을 위한 연구의 기초자료를 얻고자 토마토 유식물체에 $Ca^{2+}$ 농도별, 종류별 처리를 통하여 토마토 육묘중 $Ca^{2+}$ 및 다른 양이온의 흡수 유형을 알아보고자 하였다. (중략)

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2003.10a
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• pp.158-162
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• 2003

• Journal of Bio-Environment Control
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• v.32 no.1
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• pp.23-33
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• 2023

Sucrose (suc) is a disaccharide that consists of glucose (glu) and fructose (fru). It is a carbohydrate source that acts as a nutrient molecule and a molecular signal that regulates gene expression and alters metabolites. This study aimed to evaluate whether suc-specific signaling induces an increase in bioactive compounds by exogenous suc absorption via roots or whether other factors, such as osmotic stress or biotic stress, are involved. To compare the osmotic stress induced by suc treatment, 4-week-old cultured mugwort plants were subjected to Hoagland nutrient solution with 10 mM, 30 mM, and 50 mM of suc or mannitol (man) for 3 days. Shoot fresh weight in suc and man treatments was not significantly different from the control. Both man and suc treatments increased the content of bioactive compounds in mugwort, but they displayed different enhancement patterns compared to the suc treatments. Mugwort extract treated with suc 50 mM effectively protected HepG2 liver cells damaged by ethanol and t-BHP. To compare the biotic stress induced by suc treatment, 3-week-old mugwort plants were subjected to microorganism and/or suc 30 mM with Hoagland nutrient solution. Microorganisms and/or suc 30 mM treatments showed no difference about the shoot fresh weight. However, sugar content in mugwort treated with suc 30 mM and microorganism with suc 30 mM treatment was significantly higher than that of the control. Suc 30 mM and microorganism with suc 30 mM were effective in enhancing bioactive compounds than microorganism treatment. These results suggest that mugwort plants can absorb exogenous suc via roots and the enhancement of bioactive compounds by suc treatment may result not from osmotic stress or biotic stress because of microorganism, but by suc-specific signaling.

• Korean Journal of Soil Science and Fertilizer
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• v.47 no.1
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• pp.23-27
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• 2014

Nutrient accumulation in surface soil has become a serious problem for cucumber production in greenhouse. However, still in many cases, soil management practices are only focused on maintaining crop yield, regardless of sustainability related with soil chemical properties. This study was conducted to propose a sustainable soil management practice by investigating the impact of cover crop species and nitrogen rate of fertigated solution on cucumber yield and soil chemical properties in greenhouse condition. Rye and hairy vetch were tested as a fallow cover crop, and each amount of urea (1/2, 3/4, 1 times of N fertilizer recommendations), determined by soil testing result, was supplied in fertigation plots as an additional nitrogen source. The result showed that the yield of cucumber was higher in rye treatment than control and hairy vetch treatment. In addition, rye effectively reduced EC and accumulated nutrients from the soil. Meanwhile, N concentration of fertigated solution showed no significant effect on the growth and yield of cucumber. Consequently, these results suggest that it is desirable to choose rye as a fallow catch crop for sustainable cucumber production in greenhouse.