Back to Search
Start Over
Influence of covering material and shading on the spectral distribution of light in greenhouses
- Source :
- Journal of Agricultural Engineering Research, Journal of Agricultural Engineering Research, Elsevier-Academic Press;Elsevier, 1999, pp.341-351
- Publication Year :
- 1999
- Publisher :
- HAL CCSD, 1999.
-
Abstract
- The solar photon flux distribution was measured in the range from 400 to 1100 nm under a twin-span glasshouse and under the same glasshouse with blanked roof, external shading net and internal aluminized shade-screen. Measurements were also carried out under a twin-span polyethylene greenhouse, a multi-span greenhouse with fibreglass and a polyethylene tunnel. For each greenhouse configuration, the measured solar photon flux spectra were used to calculate the solar transmission for the photosynthetically active radiation waveband (PAR), from 400 to 700 nm, the near infrared waveband (NIR), from 700 to 1100 nm, and the whole waveband (TOTAL), from 400 to 1100 nm. Other parameters having a physiological interest were also determined: the broadband PAR to TOTAL photon flux ratio and PAR to NIR photon flux ratio; and the morphogenesis-related parameters, such as the red to far red photon flux ratio, the phytochrome equilibrium, the relative cycling rate, the blue to red photon flux ratio and the blue to far red photon flux ratio. The results provided a better insight on the quantitative and qualitative properties of the light environment under each greenhouse configuration. Some significant differences in the values of blue light quality related parameters were found between greenhouses. Minor changes were observed on the PAR:TOTAL and PAR:NIR photon flux ratios, but indicated that glass and blanking tend to enrich the PAR content of the transmitted light, while the two plastic cover materials have the opposite effect, enriching the NIR content. These results stressed the need for a more precise characterization of modifications in light quality induced by greenhouse materials or shading devices as plant photosynthetic and photomorphogenetic responses may be significantly influenced by these modifications.
- Subjects :
- [SDE] Environmental Sciences
Materials science
Spectral power distribution
020209 energy
[SDV]Life Sciences [q-bio]
Greenhouse
02 engineering and technology
Aquatic Science
RAYONNEMENT PAR
7. Clean energy
Spectral line
chemistry.chemical_compound
Optics
0202 electrical engineering, electronic engineering, information engineering
ComputingMilieux_MISCELLANEOUS
business.industry
Near-infrared spectroscopy
Far-red
04 agricultural and veterinary sciences
Polyethylene
[SDV] Life Sciences [q-bio]
chemistry
13. Climate action
Photosynthetically active radiation
[SDE]Environmental Sciences
040103 agronomy & agriculture
0401 agriculture, forestry, and fisheries
Shading
business
Subjects
Details
- Language :
- French
- ISSN :
- 00218634 and 10959246
- Database :
- OpenAIRE
- Journal :
- Journal of Agricultural Engineering Research, Journal of Agricultural Engineering Research, Elsevier-Academic Press;Elsevier, 1999, pp.341-351
- Accession number :
- edsair.doi.dedup.....c3424201019cf0d19fc86ed4a97325bc