• Korean Journal of Agricultural and Forest Meteorology
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• v.23 no.3
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• pp.163-168
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• 2021

The growth experiment under shading condition has been performed to understand the eco-physiological responses of crops to light in terms of photosynthesis. There are two types of shading: overall shading and partial shading. In this study, the chlorophyll fluorescence of soybean was observed under the overall shading of the box made by polyresin and the partial shading at agrivoltaic system. The overall shading condition during vegetative growth induced lower SPAD and Electron transport rate (ETR). These lower values recovered after removal of shading box. However, the Non-photochemical fluorescence quenching (NPQ) became lower under overall shading and higher under partial shading. Such increase in NPQ limited crop photosynthesis even though the ETR was almost same to the control without shading treatment. Under the condition of partial shading, the values of SP AD and ETR for soybean did not change. However, the NPQ was higher than control condition. This suggests that the crop photosynthesis under both types of shading would be decreased by different eco-physiological processes which are the lower ETR in overall shading and the higher NP Q in partial shading despite the reduced light under shading conditions.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.25 no.4
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• pp.1-13
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• 2022

This study was conducted to investigate the chlorophyll content, photosynthetic characteristics, and growth characteristics of Aster koraiensis and Dendranthema zawadskii var. latiloba according to shading treatment. A. koraiensis and D. zawadskii grew in four different shading treatment plots (0%, 50%, 75% and 95% of full sunlight) for experiments. It was found that as the shading level increased, the total chlorophyll content increased and dark respiration decreased in both A. koraiensis and D. zawadskii, indicating that A. koraiensis and D. zawadskii increase the utilization efficiency for photosynthesis under low light conditions. In addition, as the shading level increased, the net apparent quantum yield increased, resulting in the highest in the 95% shading plot, but the highest photosynthetic rate, water use efficiency, and leaf mass per area (LMA) were shown in the control group than in the shading treatments. The results showed that A. koraiensis and D. zawadskii are heliophytes showing plasticity to light, and if the light is restricted to continue to shade, it may be detrimental to growth. For healthy growth, it is considered suitable to grow A. koraiensis under full light conditions, and D. zawadskii under the light condition that blocks 0-50% of full sunlight.

• Journal of Practical Agriculture & Fisheries Research
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• v.16 no.1
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• pp.67-75
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• 2014

Use of mobile shading helps ameliorate heat stress of cucumber in greenhouse during summer. The mobile shading according to solar radiation may be optimal to produce high-quality cucumber in greenhouse during summer. Simultaneous comparison was made among greenhouse sections that were either not shaded or covered with reflective aluminized shadecloth that shaded 40%, or 90% of direct sunlight. Solar radiation amount, soil temperature, difference in leaf temperature and air temperature, and air temperature were lower, and relative humidity was higher as shade level increased. With increased shade level, photosynthesis rate, leaf area, fresh weight, dry weight, and number of marketable fruits increased. The mobile shading of 90% when the outer sunlight was above 650W·m^-2 yielded favorable growth environment in greenhouse of cucumber during summer.

• Journal of Convergence for Information Technology
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• v.7 no.4
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• pp.75-81
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• 2017

The design trend of information technology is quickly changed with the times. The design trend of information display is a bezel-less display, recently. The bezel-less display or edge-less display is a new trend of mobile phone display. In this study, the shading tape was manufactured for assembling process of touch panel display with the high screen-to-body ratio so-called bezel-less display. The shading tape was fabricated on PET film with the UV curable acrylic pressure sensitive adhesive(PSA) by roll-to-roll process. The UV curable PSA was synthesized with the eco-friendly toluene-less manufacturing method. The adhesive power of manufactured shading tape was investigated by motorized tensile testing machine. The thixotropic, maintaining property of cutting shape, was characterized by field emission scanning electron microscope. As results, the shading tape exhibits high adhesive power and good thixotropic performance suitable for assembly process of touch panel display. The functional shading tape will be expected to improve productivity of assembly process of touch panel display.

• Journal of Bio-Environment Control
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• v.23 no.2
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• pp.88-94
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• 2014

This study was carried out to survey the early growth characteristics of Ligularia fischeri, plants of half-shaded grounds, primarily used as functional wild edible greens and examine its shading treatment to transplant seedling. The shading treatment was regulated with the shading level(full sunlight, 35%, 50%, 75%, and 95% of full sunlight). According to the experiment, the height was the highest under 75% of shading (17.3 cm), and root diameter was the highest under full sunlight (2.13 mm). It was found that fresh weight (leaf, shoot, root and whole) was the highest (1.784 g, 1.330 g, 0.791 g, 3.905 g respectively ) under 50% of shading. In case of dry weight, leaf, shoot and whole dry weight were surveyed the highest under 35% of shading, and root dry weight was the highest under full sunlight. It was found that S/R ratio and moisture contents (leaf, shoot, root and whole) were the highest under 95% of shading. Leaf area was the highest under 50% of shading ($39.3cm^2$) and the higher shading level, the higher SLA and LAR. It was surveyed that the higher shading level, the thinner leaf thickness. In case of root characteristics, it was showed that the relatively high height growth under 35%~75% of shading, excepting 95% of shading. As a result of surveying the whole experiment, it is concluded that the early growth of L. fischeri is more effective in producing it under 50% of shading.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1999.11a
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• pp.114-117
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• 1999

표고 시설재배에서의 고품질 표고(동고, 화고)의 생산환경 분석을 위하여 차광재배와 시설재배사의 환경을 분석하여 각 시설내의 환경조건을 분석하였다. 차광재배사와 시설재배사의 기상환경 분석 결과, 시설재배의 습도는 차광재배에 비하여 20-40%높게 나타났으며, 70-80% 이상인 기간이 차광재배에 비하여 약2배 가량 높게 나타났다. 생육기간중 시설재배에서의 최고온도가 저온성 표고의 생육 온도보다 2-4$^{\circ}C$ 높아 생육에 악 영향 준 것으로 판단된다. 골목 하부로 갈수록 시설재배에서 4-5$^{\circ}C$ 높게 나타났다. 시설재배의 $CO_2$의 농도는 차광재배에 비하여 100-200ppm 정도 높게 나타났다. 이상의 결과로부터 시설내의 환기촉진과 과습방지가 시설내의 고품질 표고 생산을 위한 환경개선 방법이라고 판단된다.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.7 no.3
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• pp.73-77
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• 2004

The purpose of this study was to improve the ornamental value of Perilla frutescens var. acuta. The growth of Perilla frutescens var. acuta was significantly varied as according to light intensities. The plant height, crown width, petiole length, leaf length, leaf width, stem diameter, and chlorophyll content were the greatest with 30% shade treatment. All of growth characteristics decreased as increasing shading levels. The anthocyanin contents also decreased with 70% shading level. The leaf color turned from dark purplish red to deep yellowish green, and the growth rate and ornamental value were the lowest with 70% shading condition.

• Korean Journal of Weed Science
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• v.8 no.1
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• pp.33-36
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• 1988

The emergences of Echinochloa glabrescens, Monochoria vaginalis, and Cyperus difformis seeds were little affected by fertilizer application. All shading treaments resulted in decrease in emergence of E. glabrescens, while shading up to 67% slightly stimulated emergence of M. vaginalis and C. difformis. The peak emergence of E. glabrescens was at two week after sowing in the full sunlight, 31, and 52% shading, but no peak emergence at the 67% shading. Emergence peaks of C. difformis were observed during 6 to 8 weeks after sowing for all shading levels employed.

• FLOWER RESEARCH JOURNAL
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• v.17 no.2
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• pp.75-80
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• 2009

The objective of this research was to select the native shade tolerance plant which grows well from landscape objective of the urban. Seven species native ground cover plants were evaluated on the growth and chloropyll under 0, 40, 60, 90% shading treatments. Hosta longipes was showed the quite good growth from 60% level of natural light. The plant growth of Liriope platyphylla was good within $144.2{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ intensity which is 90% shade level of natural light. But, Dryiopteris crassirhizoma was judged with shade tolerance plant which grow quite well from shading condition level of 60% degree. Carex siderosticea was showed the highest plant length and plant width in 40% shading of natural light more than at conditon too much shading. Hosta longipes, Liriope platyphylla, Dryiopteris crassirhizoma, and Carex siderosticea were as shade tolerance plant with increases chlorophyll content well to overcome a light restrictive condition and is adapted to seem with the result.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.175-179
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• 2016

수상 태양광 발전시설은 댐이나 호소, 저수지의 잉여공간인 수면역에 설치하여 수위 변동에 대응하고 육상 대비 발전효율이 높은 발전시스템이지만 수상 태양광 발전시설의 설치로 인하여 수질오염 및 수생태계 교란을 야기할 수 있다는 우려가 지속적으로 대두 되고 있다. 본 연구는 안성시에 위치한 금광저수지 내 수상회전식 태양광 발전시설의 모니터링을 통해 발전시설의 설치가 수질에 미치는 영향을 파악하고자 하였다. 본 연구에서는 수상회전식 태양광 발전시설로 인하여 차광이 되는 차광구역 6지점과 그 외 비차광구역 4지점을 선정하여 차광으로 인한 수질의 변화를 알아보고자 하였다. 연구 결과 수상회전식 태양광 발전시설의 설치로 인하여 수체의 차광 및 광에너지 저하로 인한 수질 및 조류 농도의 변화는 통계학적으로 유의할 정도(p<0.05)의 수준은 아닌 것으로 판명되었다.