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compensation point

British  

noun

  1. botany the concentration of atmospheric carbon dioxide at which the rate of carbon dioxide uptake by a photosynthesizing plant is exactly balanced by its rate of carbon dioxide release in respiration and photorespiration

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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The CO2 compensation point, says Kasting, is the crucial limit at which the net rate of plant respiration exceeds that of oxygenic photosynthesis.

From Forbes