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Terms, recommended by the CSSA Committee on Crop Terminology, for the expression of photosynthetic energy and photosynthetic capacity are defined. These are: Photosynthetically Active Radiation (PAR), Photosynthetic Photon Flux Density (PPFD), Photosynthetic Irradiance (PI), Apparent Photosynthesis (AP), and CO2-Exchange Rate (CER).
2 Professor, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011.
Accepted for publication April 21, 1976.
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