ISHS Acta Horticulturae 711: V International Symposium on Artificial Lighting in Horticulture
INTERFERENCE PIGMENTS IN PHOTOSELECTIVE SHADING PAINT FOR GREENHOUSES |
| Author: | B. von Elsner |
| Keywords: | Greenhouse shading, interference pigments, spectral filters, photosynthetically active radiation, global radiation assessment |
| Abstract:
During summer high solar radiation some greenhouse cultivations need shading paint or woven shading fabric in order to reduce global insolation, high leaf temperatures or plant burning. Although fabrics can be adapted to changing global radiation by movable installations, shading paint reduces radiation permanently, even in cloudy conditions. A way to increase consumption of photosynthetically active radiation (PAR) is by lowering less radiation in the range of PAR while intensifying the reduction of near infrared (NIR). This can be achieved by interference pigments acting through selective reflection, scattering and transmission. Interference pigments have been evaluated through laboratory spectral measurements together with global radiation assessment as well as for plant optical properties. During a summer experiment, 2 different types of pigments in 2 concentrations were compared with conventional white wash on experimental plastic film greenhouses. The findings clearly showed that resulting inside temperature is dependent on overall reduction of global radiation. The inside spectral radiation regime followed the expected distribution in PAR and NIR in which the wavelength band of 300 to 800 nm became less shaded than the band of 800 to 1400 nm. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
