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Jirapa Austin(오스틴 지라파),Young-Yeol Cho(조영열) (사)한국생물환경조절학회 2018 시설원예‧식물공장 Vol.27 No.4
작물 생육 모델은 작물의 생육을 이해하고 통합하기 위해 유용한 도구이다. 완전제어형 식물공장에서 엽채류로 활용하기 위한 퀴노아(Chenopodium quinoa Willd.)의 초장, 광합성률, 생장 모델을 예측하기 위한 모델을 1차식, 2차식 및 비선형 및 선형지수 등식을 사용하여 개발하였다. 식물 생육과 수량은 정식 후 5일간격으로 측정하였다. 광합성과 생장 곡선 모델을 계산하였다. 초장과 정식 후 일수(DAT)간의 선형 및 곡선 관계를 얻었으나, 초장을 정확하게 예측하기 위한 모델은 선형 등식이었다. 광합성률 모델을 비선형 등식을 선택하였다. 광보상점, 광포화점, 및 호흡률은 각각 29, 813 and 3.4 μmol·m<SUP>-2</SUP>·s<SUP>-1</SUP>였다. 지상부 생체중과 건물중은 선형관계를 보였다. 지상부 건물중의 회귀계수는 0.75 (R<SUP>2</SUP>=0.921<SUP>***</SUP>)였다. 선형지수 수식을 사용하여 시간 함수에 따른 퀴노아의 지상부 건물중 증가를 비선형 회귀식으로 수행하였다. 작물생장률과 상대생장률은 각각 22.9 g·m<SUP>-2</SUP>·d<SUP>-1</SUP> and 0.28 g·g<SUP>-1</SUP>·d<SUP>-1</SUP>였다. 이러한 모델들은 정확하게 퀴노아의 초장, 광합성률, 지상부 생체중과 건물중을 예측할 수 있다. Crop growth models are useful tools for understanding and integrating knowledge about crop growth. Models for predicting plant height, net photosynthesis rate, and plant growth of quinoa (Chenopodium quinoa Willd.) as a leafy vegetable in a closed-type plant factory system were developed using empirical model equations such as linear, quadratic, non-rectangular hyperbola, and expolinear equations. Plant growth and yield were measured at 5-day intervals after transplanting. Photosynthesis and growth curve models were calculated. Linear and curve relationships were obtained between plant heights and days after transplanting (DAT), however, accuracy of the equation to estimate plant height was linear equation. A non-rectangular hyperbola model was chosen as the response function of net photosynthesis. The light compensation point, light saturation point, and respiration rate were 29, 813 and 3.4 μmol·m<SUP>-2</SUP>·s<SUP>-1</SUP>, respectively. The shoot fresh weight showed a linear relationship with the shoot dry weight. The regression coefficient of the shoot dry weight was 0.75 (R<SUP>2</SUP>=0.921<SUP>***</SUP>). A non-linear regression was carried out to describe the increase in shoot dry weight of quinoa as a function of time using an expolinear equation. The crop growth rate and relative growth rate were 22.9 g·m<SUP>-2</SUP>·d<SUP>-1</SUP> and 0.28 g·g<SUP>-1</SUP>·d<SUP>-1</SUP>, respectively. These models can accurately estimate plant height, net photosynthesis rate, shoot fresh weight, and shoot dry weight of quinoa.
Jirapa Austin,Youn A Jeon,Mi-Kyung Cha,Sookuk Park,Young-Yeol Cho 한국원예학회 2016 원예과학기술지 Vol.34 No.3
Quinoa (Chenopodium quinoa Willd.) is a plant native to the Andean region that has become increasing popular as a food source due to its high nutritional content. This study determined the optimal photoperiod, light intensity, and electrical conductivity (EC) of the nutrient solution for growth and yield of quinoa in a closed-type plant factory system. The photoperiod effects were first analyzed in a growth chamber using three different light cycles, 8/16, 14/10, and 16/8 hours (day/night). Further studies, performed in a closed-type plant factory system, evaluated nutrient solutions with EC (salinity) levels of 1.0, 2.0 or 3.0 dS·m<SUP>-1</SUP>. These experiments were assayed with two light intensities (120 and 143 μ㏖·m<SUP>-2</SUP>·s<SUP>-1</SUP>) under a 12/12 and 14/10 hours (day/night) photoperiod. The plants grown under the 16/8 hours photoperiod did not flower, suggesting that a long-day photoperiod delays flowering and that quinoa is a short-day plant. Under a 12/12 h photoperiod, the best shoot yield (both fresh and dry weights) was observed at an EC of 2.0 dS·m<SUP>-1</SUP> and a photosynthetic photon flux density (PPFD) of 120 μ㏖·m<SUP>-2</SUP>·s<SUP>-1</SUP>. With a 14/10 hphotoperiod, the shoot yield (both fresh and dry weights), plant height, leaf area, and light use efficiency were higher when grown with an EC of 2.0 dS·m<SUP>-1</SUP> and a PPFD of 143 μ㏖·m<SUP>-2</SUP>·s<SUP>-1</SUP>. Overall, the optimal conditions for producing quinoa as a leafy vegetable, in a closed–type plant factory system, were a 16/8 h (day/night) photoperiod with an EC of 2.0 dS·m<SUP>-1</SUP> and a PPFD of 143 μmol·m<SUP>-2</SUP>·s<SUP>-1</SUP>.
Austin, Jirapa,Jeon, Youn A,Cha, Mi-Kyung,Park, Sookuk,Cho, Young-Yeol Korean Society of Horticultural Science 2016 원예과학기술지 Vol.34 No.3
Quinoa (Chenopodium quinoa Willd.) is a plant native to the Andean region that has become increasing popular as a food source due to its high nutritional content. This study determined the optimal photoperiod, light intensity, and electrical conductivity (EC) of the nutrient solution for growth and yield of quinoa in a closed-type plant factory system. The photoperiod effects were first analyzed in a growth chamber using three different light cycles, 8/16, 14/10, and 16/8 hours (day/night). Further studies, performed in a closed-type plant factory system, evaluated nutrient solutions with EC (salinity) levels of 1.0, 2.0 or $3.0dS{\cdot}m^{-1}$. These experiments were assayed with two light intensities (120 and $143{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$) under a 12/12 and 14/10 hours (day/night) photoperiod. The plants grown under the 16/8 hours photoperiod did not flower, suggesting that a long-day photoperiod delays flowering and that quinoa is a short-day plant. Under a 12/12 h photoperiod, the best shoot yield (both fresh and dry weights) was observed at an EC of $2.0dS{\cdot}m^{-1}$ and a photosynthetic photon flux density (PPFD) of $120{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$. With a 14/10 h photoperiod, the shoot yield (both fresh and dry weights), plant height, leaf area, and light use efficiency were higher when grown with an EC of $2.0dS{\cdot}m^{-1}$ and a PPFD of $143{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$. Overall, the optimal conditions for producing quinoa as a leafy vegetable, in a closed-type plant factory system, were a 16/8 h (day/night) photoperiod with an EC of $2.0dS{\cdot}m^{-1}$ and a PPFD of $143{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$.
선형, 쌍곡선과 Beta 함수를 이용한 상추의 주요 온도 비교
차미경,김춘식,Jirapa Austin,조영열 (사) 한국생물환경조절학회 2014 생물환경조절학회지 Vol.23 No.1
The objective of this study was to estimate cardinal temperatures for germination of lettuce (Lactuca sativarL.) using bilinear, parabolic, and beta distribution functions. Seeds of lettuce were germinated in a growth chamberat 7 constant temperatures: 10, 14, 16, 20, 24, 28, and 32oC. Four replicates of 100 seeds were placed on twolayers of filter paper in a 9 cm petri-dish. Radicle emergence of 1 mm was scored as germination. The time course ofgermination was modeled using a logistic function. These minimum, optimum, and maximum temperatures wereestimated by regression of the inverse of time to 50% germination rate against the temperature gradient. In bilinearfunction, minimum, optimum, and maximum temperatures were 7.9oC, 23.3oC, and 28.0oC, respectively. In parabolicfunction, minimum, optimum, and maximum temperatures were 9.7oC, 19.5oC, and 29.4oC, respectively. Inbeta distribution function, minimum, optimum, and maximum temperatures were 3.7oC, 20.7oC and 32.0oC, respectively. Minimum, optimum, and maximum ranges of temperatures were 3.7~9.7oC, 19.5~23.3oC, and 28.0~32.0oC,respectively. 본 연구의 목적은 선형, 쌍곡선, 베타 함수를 이용하여상추의 주요 온도를 예측하기 위함이다. 상추 종자를 항온 생육상에서 발아시켰다. 온도처리는 10oC, 14oC, 16oC,20oC, 24oC, 28oC와 32oC였다. 100개의 종자를 9cm 페트리디쉬에 필터페이퍼 2장을 깔고 4반복 실시하였다. 유근이 1mm 나왔을 때를 발아로 하였다. 시간에 따른발아율은 로지스틱 함수로 계산하였다. 최저, 최적, 최고온도는 50% 발아한 시점의 역수를 온도에 따른 함수로표기하여 나타내었다. 선형 함수의 경우, 최저, 최적, 최고 온도는 각각 7.9oC, 23.3oC, 28.0oC였으며, 쌍곡선 함수의 경우, 최저, 최적, 최고 온도는 각각 9.7oC, 19.5oC,29.4oC였으며, 베타 함수인 경우, 최저, 최적, 최고 온도는 각각 3.7oC, 20.7oC, 32.0oC였다. 최저, 최적, 최고 온도 범위는 각각 3.7~7.9oC, 19.5~23.3oC, 28.0~32.0oC이었다.
Aphiwat Pankaew,Jirapa Rueangsuwan,Rakchart Traiphol,Nisanart Traiphol 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
This study introduces a facile approach for fabricating colorimetric sensors that differentiate concentrationand molecular weight of poly(methyl methacrylate) (PMMA). A cationic surfactant, cetyltrimethylammoniumbromide (CTAB), is incorporated into the structure of polydiacetylene(PDA)/Zn2+/ZnOnanocomposites via a simple mixing process. The interaction between PMMA carbonyl group andCTAB headgroup is the key mechanism inducing color transition of the nanocomposites. The sensitivitycan be tuned by adjusting experimental parameters including CTAB concentration, photopolymerizationtime, and PDA alkyl chain length. Solid-state sensors are fabricated by embedding into filter papers. Ourfinding extends the utilization of PDA-based materials in polymer sensing applications.