A robust, relatively low cost (parts $300 Aust., 1976) instrument suitable for field studies was constructed to give rapid estimates of photosynthetically active radiation, both absolute and as percentage transmission, within plant canopies. The instrument consists of 9 selenium photocells mounted i
A Sensor for Measurement of Spatial Heterogeneity of Photosynthetically Active Radiation
✍ Scribed by M. Méthy; J. Fabreguettes; J.L. Salager; F. Jardon
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 193 KB
- Volume
- 58
- Category
- Article
- ISSN
- 0021-8634
No coin nor oath required. For personal study only.
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Knowledge of the photosynthetically active radiation is necessary in different applications dealing with plant physiology, biomass production and natural illumination in greenhouses. Nevertheless, as a result of the absence of widespread measurements of this radiometric flux, it is often calculated
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## METHODS Fabrication of Thermocouple-Light Probe Standard 1 mm glass pipettes were drawn to an outer tip diameter of -50 pm and an interior diameter of -30 pm. An annular thermocouple junction was formed at the tip by vapor deposition of nickel and copper on the pipette. First, a 2,000 A nickel