• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1999.11a
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• pp.192-195
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• 1999

작물은 생육단계에 따라 양분의 흡수특성이 다르기 때문에 생육단계별로 적정 양액농도를 구명해야만 영양생장과 생식생장이 병행된 과채류에 있어서 균형을 유지할 수 있다. 노 등(1995)은 토마토의 펄라이트경 양액재배시 육묘기 때에 양액농도를 EC 0.5mS/cm에서 3.0mS/cm로 높임에 따라 유묘의 광합성속도가 증가하였으나 그 이상의 범위에서는 오히려 감소하였으며, 초장, 엽장, 엽폭, 경경 및 지상부 건물중은 양액농도를 0.5mS/cm에서 5.0mS/cm로 높임에 따라 계속 증가한다고 보고하였다. (중략)

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.3 no.4
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• pp.319-328
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• 2005

This paper describes a compartment dynamic model for evaluating the contamination level of kritium in agricultural plants exposed by accidentally released tritium. The present model uses a time-dependent growth equation of plant so that it can predict the effect of growth stage of plant during the exposure time. The model including atmosphere, soil and plant compartments is described by a set of nonlinear ordinary differential equations, and is able to predict time-dependent concentrations of tritium in the compartments. To validate the model, a series of exposure experiments of HTO vapor on Chinese cabbage and radish was carried out at the different growth stage of each plant. At the end of exposure, the tissue free water(TFWT) and the organically bound tritium(OBT) were measured. The measured concentrations were agreed well with model predictions.

• Proceedings of the Korean Society of Crop Science Conference
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• 2001.05a
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• pp.104-105
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• 2001

• Proceedings of the Korean Society of Crop Science Conference
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• 1994.06a
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• pp.126-127
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• 1994

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05b
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• pp.639-644
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• 1998

온실내에서 $^{85}$ Sr, $^{103}$ Ru, $^{134}$ Cs의 혼합용액을 배추의 생육중 다섯 차례에 걸쳐 분무기를 이용하여 엽면 처리하고 오염경로를 해석하였다. 작물체에 의한 차단계수는 핵종간에 차이없이 처리시기가 수확기에 가까울수록 증가하여 최고 약 0.9에 달하였다. 작물체에 침적한 핵종의 수확시 잔류율은 처리시기에 따라 $^{85}$ Sr가 16~58%, $^{103}$ Ru이 15~73%, $^{134}$ Cs가 33～64%의 범위로 생육전기 처리 시에는 $^{134}$ Cs가, 후기 처리시에는 $^{103}$ Ru이 가장 높았다. 강우처리에 의해 수확시 핵종농도가 비교적 크게 감소됨을 확인하였다. 수확된 배추의 겉잎을 제거함으로써 배추내 핵종농도를 효과적으로 낮출 수 있다는 것이 입증되었다. 본 연구결과는 배추의 생육중 사고침적시 배추내 핵종농도 예측 및 대책 수립에 활용될 수 있다.

• Proceedings of the Korean Society of Crop Science Conference
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• 2020.11a
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• pp.54-54
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• 2020

• Journal of Bio-Environment Control
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• v.27 no.2
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• pp.132-139
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• 2018

The photosynthetic rate is an indicator of the growth state and growth rate of crops and is an important factor in constructing efficient production systems. The objective of this study was to develop a canopy photosynthetic rate model of romaine lettuce using the three variables of $CO_2$ concentration, light intensity, and growth stage. The canopy photosynthetic rates of the lettuce were measured at five different $CO_2$ concentrations ($600-2,200{\mu}mol{\cdot}mol^{-1}$), five light intensities ($60-340{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$), and four growth stages (5-20 days after transplanting) in three closed acrylic chambers ($1.0{\times}0.8{\times}0.5m$). A simple multiplication model expressed by multiplying three single-variable models and the modified rectangular hyperbola model including photochemical efficiency, carboxylation conductance, and dark respiration, which vary with growth stage, were also considered. In validation, the $R^2$ value was 0.923 in the simple multiplication model, while it was 0.941 in the modified rectangular hyperbola model. The modified rectangular hyperbola model appeared to be more appropriate than the simple multiplication model in expressing canopy photosynthetic rates. The model developed in this study will contribute to the determination of an optimal $CO_2$ concentration and light intensity with the growth stage of lettuce in plant factories.

• Korean Journal of Remote Sensing
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• v.37 no.5_1
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• pp.1199-1206
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• 2021

Accordingly, attention is also being paid to the agricultural use of remote sensing technique that non-destructively and continuously detects the growth and physiological status of crops. However, when remote sensing techniques are used for crop monitoring, it is possible to continuously monitor the abnormality of crops in real time. For this, standard growth information of crops is required and relative growth considering the cultivation environment must be identified. With the relationship between GDD (Growing Degree Days), which is the cumulative temperature related to crop growth obtained from ideal cultivation management, and the vegetation index as standard growth information, compared with the vegetation index observed with the spectralreflectance sensor(SRS_NDVI & SRS_PRI) in each rice paddy treated with standard cultivation management and non-fertilized, it was quantitatively identified as a time series. In the future, it is necessary to accumulate a database targeting various climatic conditions and varieties in the standard cultivation management area to establish a more reliable standard growth information.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1998.05a
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• pp.165-167
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• 1998

식물은 생육에 필요한 특정양분의 요구도가 환경요인, 품종 및 생육단계에 따라 좌우된다. 양액내 특정양분의 부족과 축적은 NFT같은 순환식 재배시스템에서 많은 문제점으로 나타나고 있는데 이는 식물생육이 주로 근권내 EC 조절에 의존하기 때문이다. 일반적으로 Ca, Mg, SO$_4$, Cl, Na, HCO$_3$$^{-}$등이 축적되기 쉬워 대규모 엽채류 재배농가와 식물공장에서 작물생육에 영향을 주는 것으로 알려져 있다. (중략)

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1994.05a
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• pp.121-122
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• 1994

배양액농도는 작물의 양분과 수분흡수에 영향을 주고 생육, 수량 및 품질에 미치는 영향이 큰 근권제어요인이다. 순수수경재배에서는 작물종류별 배양액농도에 대한 연구가 많이 되어 있으나 배지경에서 배지종류별 작물에 따른 적정배양액 농도에 대한 연구는 드물다. 특히 적정배양액 농도는 작물종류, 품종, 생육단계에 따라 다르고, 생산물의 품질에도 지대한 영향을 미치는 것으로 밝혀지고 있다. 따라서 토마토에서 배지종류별(펄라이트, 버미큘라이트, 피트모스) 육모기와 정식후 배양액농도에 따른 토마토 수량 및 품질에 미치는 영향을 밝히고져 실험을 수행하였다. (중략)