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제안 방법
- Transmittance for NIR (near-infrared radiation, 700-1100nm) was almost similar for all covering films. After three months of utilization optical characteristics were again analyzed. Analysis of optical characteristics of plastic coverings showed that reduction in transmittance was similar for the whole spectrum and this reduction in light transmittance was due to increased absorptance for light.
- However higher decrease in transmittance for PAR was observed in PE film compared to TKP and TKN films. After three months of utilization relative loss in PAR transmittance was 5.7%, 5.1% and 4.5% for PE, TKN and TKP covering films, respectively. In our opinion, the most prominent factor for decreasing transmittance of covering films was a dust and dirt accumulation on the polymer’s outer surface.
- Air temperature and relative humidity were measured and recorded using TR-72U dataloggers (T&D Corp., Nagano, Japan), soil temperature was measured and recorded at 30 min interval using HOBO Pro v2 dataloggers (Onset Computer Corp., ME, USA) with embedded temperature sensors.
- During gas exchange measurement in green lettuce, red lettuce and chicory the leaf temperature, relative humidity and CO2 levels within the leaf chamber were set at 26°C, 70±5%, and 400µmol·mol−1, respectively.
- Experiment was arranged in a completely randomized design with four replications. Data were subjected to analysis of variance (ANOVA) and means of treatments were separated by Duncan’s multiple range test at p ≤ 0.
- External integrating sphere (model - 1800-12) connected to spectroradiometer via quartz fiber optic probe (model - 1800-10) was utilized to investigate the optical characteristics of three cover materials. Optical characteristics were analyzed for the new plastic films and after three months of utilization period as a greenhouse covering (March, April, and May). Relative loss in transmittance was determined as (Geoola et al, 1998):
- Solar radiation spectral distribution in the 300-1100nm waveband in minigreenhouses covered by three plastic films was analyzed by means of LI-1800 spectroradiometer (Licor, Lincoln, NE, USA) with the standard cosine receptor on a clear day at solar noon (12:00 - 13:00). External integrating sphere (model - 1800-12) connected to spectroradiometer via quartz fiber optic probe (model - 1800-10) was utilized to investigate the optical characteristics of three cover materials.
대상 데이터
- 3. Diurnal course of air temperature and relative humidity in greenhouses covered by three plastic materials.
- The experiment was conducted in the minigreenhouses at the Protected Horticulture Research Station, Busan, Korea (35°N and 128°E) during March-May in 2014.
데이터처리
- Data were subjected to analysis of variance (ANOVA) and means of treatments were separated by Duncan’s multiple range test at p ≤ 0.05 in the SAS 9.1 software (SAS Institute Inc. Cary, NC, USA).
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