Quantitative methods for evaluating the conversion performance of spectrum conversion films and testing plant responses
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RESEARCH REPORT
Quantitative methods for evaluating the conversion performance of spectrum conversion films and testing plant responses under simulated solar conditions Hyo In Yoon1 · Jin Hyun Kim2 · Kyoung Sub Park3 · Jin Woong Namgoong4 · Tae Gyu Hwang4 · Jae Pil Kim4 · Jung Eek Son1 Received: 1 June 2020 / Revised: 13 July 2020 / Accepted: 6 August 2020 © Korean Society for Horticultural Science 2020
Abstract Spectrum conversion film (SCF) is a covering material that modifies incident solar spectrum to more-active wavelengths in photosynthesis. Due to its fluorescence property, the performance of SCF cannot be accurately evaluated in a conventional way for agricultural films. We proposed quantitative methods to evaluate the conversion performance of SCF and tested the plant responses. The performance of GR films [green light (500–600 nm) to red light (600–700 nm)] containing different concentrations of dye (40–3000 ppm) was tested in comparison to a transparent film (control). A method for estimating light emission was developed using a series of equations and values measured under artificial lighting. The spectral properties and photosynthetic rates of sweet pepper (Capsicum annuum L.) leaves covered with the GR film were measured using a solar simulator. The emission of GR film was detected using a spectroradiometer connected to an integrating sphere instead of using a spectrophotometer used in the conventional method. The transmittance of GR film and its change rate of transmitted photon flux densities at emission wavelength differed depending on the light source. The change rate calculated through the equations was constant within the target spectrum and could be used as a basis for conversion performance. The solar spectrum modified by the GR film caused to increase the red light reaching the leaves by 10.47% and thereby increased the photosynthetic rates by 15.41% compared to the control. The photosynthetic efficiency based on incident and absorbed photons under the GR film increased by 22.14% and 21.87%, respectively. These methods were proposed for quantifying spectral properties of SCF under the solar spectrum, confirming the application of solar simulator for photosynthetic evaluation. When used as a standard light source for SCF, a solar simulator provides indoor test conditions with a spectrum similar to solar radiation without long-term cultivation or a large-scale film test. Keywords Greenhouse covering material · Light conversion film · Photosynthetic efficiency · Spectroradiometer · Sweet pepper
Communicated by Young Yeol Cho, Ph.D. * Jung Eek Son [email protected] 1
Department of Agriculture, Forest and Bioresources (Horticultural Science & Biotechnology Major) and Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Korea
2
Protected Horticulture Research Institute, National Institute of Horticultural and Herbal Science, Haman 52054, Korea
3
Department of Horticultural Science, Mokpo National University, Muan 58554, Korea
4
Department of M
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