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Estimation of Evapotranspiration Model for Seasonal Irrigation Control of Garlic
Ui Jeong Woo,Won Jun Jo,Ha Seon Sim,Hye Jin Lee,Yu Hyun Moon,Soo Bin Jung,Su Ran Ahn,Jung Su Jo,Sung Kyeom Kim 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
Irrigation amount and schedule is considered depend on the cultivation environments, cultural practices, crop species and it is necessary to estimate the water requirement accurately for efficient irrigation management. The purpose of this experiment is to estimate the amount of evapotranspiration of garlic (ETc) using the Penman-Monteith (P-M) equation in open field cultivation and to supply an appropriate amount of water per unit area for each season. The experiment was conducted from October 7, 2020 to June 16, 2021 at the open field of Kyungpook National University’s trial farm. Environmental data in terms of air temperature, wind speed, humidity, and solar radiation required for evapotranspiration amount (ETo) calculation were collected every 10 minutes in a data logger. The ETc was estimated by P-M equation. The average daily air temperature and relative humidity were maintained at 10.4°C and 52.7%, respectively during experiment periods. The daily average of ETo was approximately 5.9 mm and that increased at the late spring and the early summer cultivation season. When calculating seasonal ETo by four seasons based on 24 seasonal divisions, the daily averages of ETo were 6.07 mm, 4.92 mm, 6.42 mm, and 6.75 mm, respectively, autumn, winter, spring, and summer in sequence. ETo in winter was estimated to be lower than in other seasons, which is considered to be that crop transpiration was reduced due to dormancy. The ETc was calculated by multiplying ETo and the crop coefficient (Kc ini = 0.7, Kc mid = 1.0, and Kc end = 0.7). The seasonal average irrigation amount (ETc × cultivation area) per 10a was estimated 4.2 ton, 4.5 ton, 6.2 ton, and 4.7 ton, respectively. In addition, ETo increased from 200 days after transplanting, a period when the leaf senescence rate, bulb weight, and bulb diameter increased rapidly. Results founded that the seasonal irrigation amount of garlic estimated using the P-M equation can be applied for precise irrigation control.
Jung, Ui-Won,Kim, Chang-Sung,Choi, Seong-Ho,Cho, Kyoo-Sung,Inoue, Takashi,Kim, Chong-Kwan Blackwell Publishing Ltd 2007 Clinical oral implants research Vol.18 No.2
<P>Abstract</P><P>Objectives</P><P>This study was conducted to evaluate the healing of surgically created circumferential gaps around non-submerged-type implants according to varying size and healing periods in dogs.</P><P>Material and methods</P><P>In four mongrel dogs, all mandible premolars were extracted and after an 8-week healing period, non-submerged-type implants were placed. Circumferential coronal defects around the implants were performed surgically with a customized tapered step drill. Groups were divided according to the width of the coronal gaps: 1, 1.5, or 2 mm. First the right side of the mandible was prepared, and after 8 weeks, the left side was prepared. The dogs were sacrificed following an 8-week healing period. Specimens were analyzed histologically and histomorphometrically.</P><P>Results</P><P>As the size of the coronal gap increased, the unfilled area tended to be greater. In terms of bone-to-implant contact and bone density, both the 1 and 1.5 mm groups showed a larger percentage of coronal defect than the apical side, while the 2 mm group showed contrary results in the 8-week groups. The general histologic features in the 16-week groups were similar to the findings of 8-week groups but were more matured, with a higher percentage of lamellar bone. A certain amount of bone filling and osseointegration was observed in the defects of all the groups.</P><P>Conclusion</P><P>It can be concluded that the remaining defect, small enough to be clinically neglected, irrespective of gap size within 2 mm, does not need any kind of regenerating procedures.</P>
Measurement of proton beam range by using scintillating fiber optic dosimeter
Ui-Jung Hwang,Hojin Jeong,Jeong-Eun Rah,Seung Hoon Yoo,Byung Jun Min,Sang-Yeob Lee,Myonggeun Yoon,Dong Ho Shin,Se Byeong Lee,Sung Yong Park,Kyong Won Jang,DongHyun Cho,Bongsoo Lee 대한방사선방어학회 2010 대한방사선방어학회 학술발표회 논문요약집 Vol.2010 No.11
Won Jun Jo,Ha Seon Sim,Hye Jin Lee,Yu Hyun Moon,Ui Jeong Woo,Soo Bin Jung,Su Ran Ahn,Jung Su Jo,Sung Kyeom Kim 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
The photosynthetic rates of leaves depend on the crop characteristics and vertical position of the leaf in terms of leaf age and development stages. The photosynthetic models of crops are an important factor for manipulating the optimum CO₂ concentration and light intensity for crop productivity in a greenhouse. However, few models have been proposed to estimate the net photosynthetic rate according to leaf positions. The purpose of this study was to predict and validate the leaf photosynthetic rate of cucumber (Cucumis sativus L., cv. Goodmorning) by the vertical positions using a photosynthetic model. The leaf photosynthetic rate at the vertical positions was measured under several CO₂ concentrations and light intensity conditions in the three plants. Leaf photosynthetic was analyzed using the FvCB (Farquhar, von Caemmerer, and Berry) model and validated as a multivariable photosynthetic model. As the CO₂ concentration and light intensity increased, the photosynthetic rate of the leaf showed a saturation curve. The CO₂ concentrations and light intensities saturation point were the highest in the upper leaf (at three internodes below the meristems) and lowest in the bottom leaf (at two or three internodes over the substrate area). The maximum carboxylation capacity (μmol·CO₂·m<SUP>-2</SUP>·s<SUP>-1</SUP>) and maximum electron transport rate (μmol·m<SUP>-2</SUP>·s<SUP>-1</SUP>) estimated in the FvCB model were high accuracies in regression analysis. As a result of comparing the actual measured photosynthetic rate and the estimated values through the FvCB model, the R² values at the bottom, middle, and upper leaf were 0.89, 0.89, and 0.87, respectively. The root means square errors values at the bottom, middle, and upper leaf were 2.521, 2.958, and 3.200, respectively. The leaf photosynthetic rate for each vertical position estimated from the FvCB model was similar to the actual measured value. Results, the FvCB model could be feasible to establish optimal CO₂ concentration and light intensity to maintain the productivity of cucumber in greenhouse cultivation.