• 한국식생활문화학회지
• /
• 제35권6호
• /
• pp.590-596
• /
• 2020

Buckwheat (Fagopyrum species) has long been an excellent functional food. Besides, buckwheat sprouts contain various functional substances. In this study, we investigated the antioxidant activity of buckwheat sprouts in the context of cultivars harvested after different cultivation periods (0, 3, 5, 7, 9, 13, and 15 days after planting). Buckwheat sprouts were cultivated at 25℃ for up to 15 days and then extracted with ethanol. Antioxidant components were then extracted from sprouts and leaves using a freeze dryer. The total polyphenolic content, flavonoid content, and antioxidant activity were then analyzed. The total polyphenol content increased from 32.26 mg GA eq/100 g for raw buckwheat to 114.75 mg GA eq/100 g after 7 days of cultivation. Also, the flavonoid content increased from 20.61 mg catechin eq/100 g (0 days) to 56.54 mg/g after 9 days of cultivation. The DPPH radical scavenging activity (concentration of extract at 0.25 mg/mL) increased from 7.89% at day 0 to 53.48% after 9 days of cultivation. Additionally, the ABTS radical scavenging activity increased from 10.26% at day 0 to 32.89% after 7 days of cultivation; of note, the activity decreased afterward. These results suggest that the best buckwheat sprouts with higher biological activities are those cultivated for 7-9 days. For a complete understanding of the potential of buckwheat sprouts as functional foods, we plan to further analyze their antioxidant activity in the future.

• 인간식물환경학회지
• /
• 제23권6호
• /
• pp.647-654
• /
• 2020

Background and objective: Particulate matter (PM) is one of the serious environmental problems and threatens human health. Plants can clean the air by removing PM from the atmosphere. This study was carried out to investigate the PM removal efficiency of 12 species of woody plants. Methods: Actinidia arguta, Dendropanax morbiferus, Fraxinus rhynchophylla, Parthenocissus tricuspidata, Pittosporum tobira, Rhaphiolepis indica, Rhapis, Salix integra, Salix koreensis, Schisandra chinensis, Viburnum odoratissimum var. awabuki, and Vitis coignetiae were used as plant material. Six 15 cm (D) pots were placed in an acrylic chamber of 800 (D) × 800 (W) × 1000 (H) mm. The LED panel was used as a light source. The reduction of PM10, PM2.5, and PM1 for 300 minutes after the injection of PM was automatically measured. Results: The leaf area and the amount of PM in the chamber showed a negative correlation. 12 species of plants were compared by dividing the plants into 3 groups according to their characteristics: vines, trees, and shrubs and small trees. In the vine plant group, the averages of PM10, PM2.5, and PM1 were 7.917%, 8.796%, and 30.275%, respectively. In the shrubs and small trees group, the average of PM10, PM2.5, and PM1 were 10.142%, 11.133%, and 36.448%, respectively. In the trees group, the average of PM10, PM2.5, and PM1 were 11.475%, 12.892%, and 40.421%, respectively. When the initial concentration was 100%, PM10, PM2.5, and PM1 of Viburnum odoratissimum var. awabuki with the largest leaf area were 5.6%, 6.3%, and 21.0% after 5 hours, respectively, the best results among 12 species of plants. Conclusion: The vine plant group was more effective in removing PM than the other two groups. In the tree groups, the fact that the leaf development was relatively inactive at a plant height of 30 cm was considered to have an effect on the removal of particulate matter.

• 인간식물환경학회지
• /
• 제23권1호
• /
• pp.115-123
• /
• 2020

With the aim of accumulating data that can be used to infer the basis for the acculturation of trees called 'Goe,' this study aims to identify the survival status of the pagoda and zelkova trees known as 'Goe' trees by comparing and analyzing the status of pagoda trees (Sophora japonica) and zelkova tree (Zelkova serrata) designated as a protected tree in Korea. The results of this study are as follows; Zelkova serrata designated as a protected tree grows the most, with 2,147 trees (29.4%) in Cheonnam, followed by Chungnam (16.5%) and Gyeongbuk (14.4%). However, Sophora japonica showed a different result from zelkova Serrata as the total number of 210 Sophora japonica (55.7%) in Gyeongbuk and Daegu is much larger than that of zelkova Serrata. As a result, in the Yeongnam region, where the Confucianism of Yeongnam was actively practiced, the existence of Sophora japonica is much larger than that of the Zelkova Serrata, which is not a coincidence, and it is difficult to determine it only based on their flora and planting distribution. Results of comparing protected trees of Sophora japonica and Zelkova Serrata showed that the average age of Zelkova Serrata wass 289 years, while that of Sophora japonica was 302 years, and that the average height of Zelkova Serrata wass 18 m, which is higher than the height of 16 m of Sophora japonica. The average diameter at breast height of Zelkova Serrata was 398 cm and that of Sophora japonica was 314 cm, which indicates that Zelkova Serrata is relatively big. Therefore, it can be assumed that Zelkova Serrata has a larger growth potential than Sophora japonica, and the possibility of growth as a big tree is also high, but it seems that the explanation that "they are relatively long-lived" is not clearly determined.

• 한국작물학회지
• /
• 제33권3호
• /
• pp.254-261
• /
• 1988

Lysimeter and field experiments were conducted in Sandy Loam to establish a simple estimation model for evapotranspiration (ET) of soybean for three years (l984-1986). Potential ET (PET) could be estimated by the eq.1 using Pan-evaporation (Eo) and was ranged from 1.1 to 4.6 mm/day during the experiments. PET (mm/day)=1.348＋0.573 Eo …(1) Crop coefficient (Kc=maximum ET/PET) could be estimated by the eq.2 using Growth degree (G=days after planting/total growing days) and was ranged from 0.2 to 1.1 and from 0.6 to 1.4 for monoculture cropping and double cropping followed by barley, respectively, during the experiments. Monoculture : Kc=0.016＋3.719 G-3.224 G$^2$…(2), Double cropping : Kc=0.609＋2.014 G-2.120 G$^2$…(2). However, the maximum Kc was shown when G was about 50% and 40% for the monoculture and the double cropping, respectively. Soil water coefficient (f=AET/maximum ET) could be estimated by the eq.3 using soil water tension (Ψ) in 15cm depth. and it was decleased to 0.2 when Ψ was 10 bar. f=0.755-0.537 log │Ψ│…(3) Consequentially, the model to estimate the Actual ET (AET) of soybean was determined as eq.4 with the correction coefficient of -0.380. AET(mm/day)=PETㆍKcㆍf -0.380 …(4) The estimated AET were compared with the measured AET to verify the model established above. The average deviation of the estimated ET(AET) was 0.5782$\pm$0.338 (mm/day), and it would be within reasonable confidence range.

• 현장농수산연구지
• /
• 제7권1호
• /
• pp.55-63
• /
• 2005

마산업 경쟁력 제고에 필수적인 대량생산 체계 확립을 위한 둥근마 씨마 생산에 있어서 소절편 크기별 상품 괴경 생산 방법에 관한 연구는 다음과 같다. (1) 분할마를 심은지 30일 후에 3g, 5g, 7g, 9g, 12g씩 분할한 절편의 발아율은 60.3%, 80.5%, 85.3%, 98.6% 및 99.3%를 나타냈다. (2) 하우스재배에서 분할 절편에 따른 괴경 비대는 3g, 5g, 7g, 9g, 12g에서 66g, 87g, 98g, 120g, 140g을 나타냈다. (3) 노지재배에서 분할 절편에 따른 괴경 비대는 3g, 7g, 12g, 18g, 23g에서 35.2g, 124.7g, 142.7g, 174.8g, 200.7g을 나타냈다.

• 디자인융복합연구
• /
• 제17권3호
• /
• pp.55-70
• /
• 2018

이 연구는 하지장애인의 보행보조를 위한 목발 디자인의 가이드라인을 개발하고 그것을 적용한 사례에 관한 장기 프로젝트의 후반부에 해당한다. 다학제적 융합연구를 통하여 목발보행에 관한 객관적인 결과를 도출하고 이를 토대로 현실적인 대안을 제시하고자 한 이 연구의 구체적인 목표는 목발을 이용한 보행 특성에 부합하고 산업 측면에서 활용성이 높은 양산형 목발의 디자인 개발과 프로토타입 제작에 있다. 연구의 결과로 개발된 혁신적인 목발인 토고(TOGO)는 (1)목발 팁과 겨드랑이 받침대의 형태 및 구조 개선을 통해 목발이 지면과의 접촉으로 발생하는 충격의 전달 최소화, (2) 보행 중 사용자의 신체에 합리적으로 대응하는 인체공학적 구조, (3)알루미늄 압출 성형에 의한 프레임 제작과 구조 개선으로 목발을 사용하지 않을 경우 휴대성·이동성을 위한 쉽고 빠른 목발의 길이 조절, (4)보행 중 안전상 위험요소 최소화 및 (5)사용자가 자존감을 지킬 수 있게 충분히 매력적인 형태 등이 특징이다. 연구 성과로 도출된 새로운 목발은 특허 출원이 완료되었으며, 현재 대량생산 환경에서 발생할 수 있는 잠재적인 문제 검토에 이어 양산을 위한 기업 탐색과 실용화 방안을 모색하고 있다.

• 한국작물학회:학술대회논문집
• /
• 한국작물학회 2017년도 9th Asian Crop Science Association conference
• /
• pp.239-239
• /
• 2017

The enhancement of leaf photosynthetic capacity can have the potential to improve the seed yield of soybean. Key targets for the increase of leaf photosynthetic capacity remains unclear in soybean. Peking, Chinese local variety, has been the useful material for soybean breeding since it shows various resistances against biotic and abiotic stress. Sakoda et al., 2017 reported that Peking had the higher capacity of leaf photosynthesis than Enrei, Japanese elite cultivar. They identified the genetic factors related to high photosynthetic capacity of Peking. The objective of this study is to elucidate the physiological basis underlying high photosynthetic capacity of Peking. Peking and Enrei were cultivated at the experimental field of the Graduate School of Agriculture, Kyoto University, Kyoto, Japan. The sowing date was July 4, 2016. Gas exchange parameters were evaluated at the uppermost fully expanded leaves on 43, 49, and 59 days after planting (DAP) with a portable gas exchange system, LI-6400. The leaf hydraulic conductance, $K_{leaf}$, was determined based on the water potential and transpiration rate of the uppermost fully expanded leaves on 60 DAP. The morphological traits related to leaf photosynthesis were analyzed at the same leaves with the gas exchange measurements. The light-saturated $CO_2$ assimilation rate ($A_{sat}$) of Peking was significantly higher than that of Enrei at 43 and 59 DAP while the stomatal conductance ($g_s$) of Peking was significantly higher at all the measurements (p < 0.05). It suggested that high $A_{sat}$ was mainly attributed to high $g_s$ in Peking. $g_s$ is reported to be affected by the morphological traits and water status inside the leaf, represented by $K_{leaf}$, in crop plants. The tendency of the variation of the stomatal density between two cultivars was not consistent throughout the measurements. On the other hand, $K_{leaf}$ of Peking was 59.0% higher than that of Enrei on 60 DAP. These results imply that high $g_s$ might be attributed to high $K_{leaf}$ in Peking. Further research is needed to reveal the mechanism to archive high $g_s$ on the basis of water physiology in Peking. The knowledge combining the genetic and physiological basis underlying high photosynthetic capacity of Peking can be useful to improve the biomass productivity of soybean.

• Weed & Turfgrass Science
• /
• 제3권4호
• /
• pp.299-304
• /
• 2014

본 연구는 예방적 잡초방제 중 하나인 가묘상의 이용방법을 체계화 하고자 처리방법과 처리시기를 달리하여 옥수수 밭에서 수행하였다. 가묘상 처리 적기를 찾기 위하여 5월 초부터 6월 초까지 1주 단위로 실시하고 3주와 7주 후 발생 잡초를 조사하였다. 잡초 억제 효과가 가장 좋았던 가묘상 처리시기는 5월 하순 이후 처리, 처리 방법으로는 화염 제초가 얕은 경운 처리보다 다소 좋았다. 또한 5월 중순 이후 가묘상 1회 처리시 무처리구 대비 27-52%였던 잡초억제율이 2회 처리시 70-90%로 높아져 가묘상의 활용 가능성을 보여주었다. 옥수수 생육 및 수량 또한 5월 하순 이후 처리구가 가장 좋았다. 이 결과를 종합했을 때 가묘상 처리 적기는 5월 하순 이후였으며 얕은경운 또는 화염으로 2회 처리를 하면 효과적인 초기잡초관리를 수행할 수 있었다.

• 농업과학연구
• /
• 제45권1호
• /
• pp.19-27
• /
• 2018

To study the effect of natural anti-microbial chemicals on the growth and quality of chili peppers, chitosan ($100mg/L^{-1}$), stevia ($250mg/L^{-1}$), and the mixture of both chemicals at the same concentration were sprayed after planting at 1-week interval throughout the experimental period. Plant height was measured twice after the $3^{rd}$ and $4^{th}$ applications. Plant height was numerically reduced in all chemical treatments compared to that of untreated control; however, there was no statistical difference between treatments. The fruit quality was examined at commercial maturity, and only minor differences were found in fruit color, length, and dry matter content between the treatments. Although a statistical difference was not present for soluble sugars levels, total phenolics, and capsaicin contents, yield in all chemical treatments significantly increased compared to untreated control. The effect on yield increase was greater at the late harvest season regardless of treatments. Total yield of 4 harvests was higher for the chitosan treatment than other treatments. During the experiment, the entire experimental field was waterlogged for 1 day due to sudden heavy rainfall, which resulted in the occurrence of bacterial browning disease in all treatments. The rate of disease occurrence and the degree of severity, however, were much lower in the chitosan treatment. In conclusion, the potential of chitosan as an alternative antimicrobial agent was confirmed in chili peppers in this study. Further research is required on stevia as an alternative chemical for disease control in chili peppers.

• 한국초지조사료학회지
• /
• 제38권2호
• /
• pp.91-98
• /
• 2018

본 시험은 여름철 논에서 사료용 케나프의 파종량, 유기질 비료 시용량 및 수확시기 등 적정 재배 방법을 확립하기 위해 2014년에 전남 강진 지역 논에서 실시하였다. 시험구는 파종량이 ha당 10, 15, 20 kg 등 3수준 및 수확 시기가 파종 후 60일, 75일, 90일 등 3수준과 동일한 파종량에 유기질 비료 시용량이 20톤, 30톤 등 2수준으로 하였고, 시험구는 분할구 배치법 3반복으로 하였다. 케나프의 파종량을 ha당 10 kg에서 20 kg까지 늘림에 따라 초장이 커지고, 수량이 증가되었다. 파종량과 관계없이 수확 시기가 60일에서 90일까지 늦춰질수록 계속 성장하여 초장은 10.1~26.0% 수량은 18.8~30.0% 증가되었고, 파종 후 75일에서 90일 사이 증가 폭이 62.3~68.9%로 가장 컸다. 그러나 수량이 증가함에 따라 조단백질과 TDN 값은 감소되고, ADF와 NDF는 증가되어 사료가 치가 감소되었다. 유기질 비료를 ha당 20톤에서 30톤으로 증가하여 시비함에 따라 평균 15.3% 수량이 증가되었다. 결과적으로 케나프 재배시 ha당 가축분퇴비 30톤을 시비하고, 종자 20 kg를 파종하며, 생육 90일에 수확하는 것이 가장 높은 수량을 얻을 수 있었다.