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).
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Richard Shibles (1976) studied this question.
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