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By T. W. Tibbitts

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Evaluation of visible radiation for plant growth. A n n u . R e v . Page, Planta P h ysiol. P. 19, 490-499. (1972). The International System (SI). National Bureau Standards Special Publication 330. Rabinowitch, E. E. (1951). "Photosynthesis and Related Processes. Interscience, New York. Shibles, R. (1976). Committee Report: Terminology pertaining to photosynthesis. Smith, H. (1975). McGraw Hill, Crop S ei. 16, 437-439. "Phytochrome and Photomorphogenesis" London. , p. 151. CONTROLLED ENVIRONMENT GUIDELINES FOR PLANT RESEARCH RADIATION: Robert CRITIQUE I J .

Significance of enhancement for calculations based on the action spectrum for photosynthesis. Plant Physiol. 49, 704-706. McCree, K. J. (1972a). The action spectrum, absorptance and quantum yield of photosynthesis in crop plants. Agric. Meteorol. 9, 191-216. McCree, K. J. (1972b). Test of current definitions of photosyn- thetically active radiation against leaf photosynthesis data. Agric. Meteorol. McCree, K. J. 10, 443-453. (1973). A rational approach to light measurements in plant ecology. Monteith, J.

In addition, the HID lamp system generally uses fewer lamps per unit area than the fluorescent lamp system so that the HID radiation exitance variations do not average out as well as in the fluorescent system. The advantages of the HID lamp system are energy saving and the higher irradiance levels than can be achieved with the fluorescent-incandescent system. Is one measurement at the beginning of an experiment enough? It would be infinitely better to confirm that the irradiation, spectral irradiance or photoperiod do not change during an experiment.

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