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Transmission properties of dry and wet greenhouse cladding materials and relation to crop photosynthesis

Ivan Pollet (UGent) , Jan Pieters (UGent) and JM Deltour
(2001) Acta Horticulturae. 559. p.285-292
Author
Organization
Abstract
Solar transmission properties of dry and condensate covered single glass and a common polyethylene film (PE) were measured as a function of incidence angle. The experiments revealed that scattering by dry glass was negligible, in contrast to dry PE which scattered 47% of the transmitted radiation. With the presence of condensate, single glass scattered 81 to 86% of the totally transmitted radiation, depending on incidence angle. At an incidence angle of 30degrees, condensate lowered the total transmittance by 4%. The scattered fraction of the radiation transmitted by the PE film was increased to 78-83% by the condensate drops, but the total amount of transmitted radiation was reduced by 22-23%. To assess the effect of scattering on plant growth, net photosynthesis rates were simulated for a tomato crop. The photosynthesis rate was predicted to be 16% higher under dry polyethylene when compared with dry glass due to the scattering proper-ties of the plastic film. The presence of condensate gave rise to a 13% higher photosynthesis rate under single glass and a reduction of 6% under polyethylene when compared with the respective materials in the dry state.
Keywords
condensation, diffusive, transmittance, forward scattering, cladding properties, CONDENSATION

Citation

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Chicago
Pollet, Ivan, Jan Pieters, and JM Deltour. 2001. “Transmission Properties of Dry and Wet Greenhouse Cladding Materials and Relation to Crop Photosynthesis.” In Acta Horticulturae, ed. N Castilla, JA Fernandez, and PF Martinez, 559:285–292. Leuven, Belgium: International Society for Horticultural Science (ISHS).
APA
Pollet, Ivan, Pieters, J., & Deltour, J. (2001). Transmission properties of dry and wet greenhouse cladding materials and relation to crop photosynthesis. In N. Castilla, J. Fernandez, & P. Martinez (Eds.), Acta Horticulturae (Vol. 559, pp. 285–292). Presented at the 5th International symposium on Protected Cultivation in Mild Winter Climates, Leuven, Belgium: International Society for Horticultural Science (ISHS).
Vancouver
1.
Pollet I, Pieters J, Deltour J. Transmission properties of dry and wet greenhouse cladding materials and relation to crop photosynthesis. In: Castilla N, Fernandez J, Martinez P, editors. Acta Horticulturae. Leuven, Belgium: International Society for Horticultural Science (ISHS); 2001. p. 285–92.
MLA
Pollet, Ivan, Jan Pieters, and JM Deltour. “Transmission Properties of Dry and Wet Greenhouse Cladding Materials and Relation to Crop Photosynthesis.” Acta Horticulturae. Ed. N Castilla, JA Fernandez, & PF Martinez. Vol. 559. Leuven, Belgium: International Society for Horticultural Science (ISHS), 2001. 285–292. Print.
@inproceedings{402047,
  abstract     = {Solar transmission properties of dry and condensate covered single glass and a common polyethylene film (PE) were measured as a function of incidence angle. The experiments revealed that scattering by dry glass was negligible, in contrast to dry PE which scattered 47\% of the transmitted radiation. With the presence of condensate, single glass scattered 81 to 86\% of the totally transmitted radiation, depending on incidence angle. At an incidence angle of 30degrees, condensate lowered the total transmittance by 4\%. The scattered fraction of the radiation transmitted by the PE film was increased to 78-83\% by the condensate drops, but the total amount of transmitted radiation was reduced by 22-23\%. To assess the effect of scattering on plant growth, net photosynthesis rates were simulated for a tomato crop. The photosynthesis rate was predicted to be 16\% higher under dry polyethylene when compared with dry glass due to the scattering proper-ties of the plastic film. The presence of condensate gave rise to a 13\% higher photosynthesis rate under single glass and a reduction of 6\% under polyethylene when compared with the respective materials in the dry state.},
  author       = {Pollet, Ivan and Pieters, Jan and Deltour, JM},
  booktitle    = {Acta Horticulturae},
  editor       = {Castilla, N and Fernandez, JA and Martinez, PF},
  isbn         = {9789066059344},
  issn         = {0567-7572},
  keyword      = {condensation,diffusive,transmittance,forward scattering,cladding properties,CONDENSATION},
  language     = {eng},
  location     = {Cartagena, Spain},
  pages        = {285--292},
  publisher    = {International Society for Horticultural Science (ISHS)},
  title        = {Transmission properties of dry and wet greenhouse cladding materials and relation to crop photosynthesis},
  url          = {http://www.actahort.org/books/559/559\_42.htm},
  volume       = {559},
  year         = {2001},
}

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