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1949). Growth and composition of Biloxi soybean grown in a controlled environment with radiation from different carbon arc sources. Plant Physiol. 24, 345-358. Proctor, J. R. A. (1973). Developmental changes in radish caused by brief end of day exposure to far red radiation. Can. J. Bot. 51, 1075-1077. Rajan, A. , and Blackman, G. E. (1971). Interrelationships between the nature of the light source, ambient air temperature and the vegetative growth of different species within growth cabinets. Ann.

Agric. Meteorol. McCree, K. J. 10, 443-453. (1973). A rational approach to light measurements in plant ecology. Monteith, J. L. Curr. Adv. Plant Sei. 3, 39-43. (1969). Light interception and radiative exchange in crop stands. In "Physiological Aspects of Crop Yield" (J. D. ), pp. 89-111. American Society of Agronomy, Madison, Wisconsin. Monteith, J. L. (1975). " London. RADIATION Monteith, 27 J. L. (1976). Spectral distribution of light in leaves and foliage. In pp. 447-460. B ut t e r w o r t h , London.

For some research problems a combina­ tion of the simplest sources and measuring devices is adequate; in other cases the most accurate and complex measuring devices may be inadequate for one reason or another. If an investigator is considering conducting research in which radiation is an important parameter and which requires the use of radiation sources and making radiation m e a s u r e m e n t s , he or she should think very seriously about methodology. When an investiga­ tor can resolve in his or her min d the explicit definitions of the 47 Copyright © 1979 by Academic Press, Inc.

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