Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Radiation Environment of Growth Chambers.
Author Tibbitts, T. W. ; McFarlane, J. C. ; Drizek, D. T. ; Berry, W. L. ; Hammer., P. A. ;
CORP Author American Society for Horticultural Science, Mount Vernon, Va. Growth Chamber Committee.;Environmental Monitoring and Support Lab., Las Vegas, Nev.
Year Published 1976
Report Number EPA/600/J-76/052;
Stock Number PB-266 822
Additional Subjects Test chambers ; Radiation measuring instruments ; Light(Visible radiation) ; Controlled atmospheres ; Illuminance ; Sensitivity ; Calibrating ; Plant growth ; Standards ; Incandescence ; Reprints
Library Call Number Additional Info Location Last
NTIS  PB-266 822 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 9p
Radiation measurements with different types of meters in several controlled environment facilities have been compiled to demonstrate the problems associated with insuring uniform radiation levels in separate facilities. Data are provided for a quantum meter, three photometers, a pyranometer and a far-red energy meter. Significant variations in total radiant energy in chambers under similar photosynthetically active radiation (PAR) levels were demonstrated. Measurement of light under cool white fluorescent and incandescent lighting with calibrated photometers from different manufacturers, varied by 20%. Greater variation occurred when photometers measurements were compared under different types of lamps. One of the most significant variations in different chambers was the intensity of incandescent radiation. This could only be effectively monitored and controlled with the far-red sensor. The study documents the need for calibration of instruments under the same type of light source that is utilized in the growth chambers and for the use of more than one type of sensing instrument to quantify the radiation that controls plant growth.