8 - 10 %
||Kirschbaum MUF (2011) Does enhanced photosynthesis enhance growth? Lessons learned from CO2 enrichment studies. Plant Physiol 155: 117–24 p.117 right column top paragraphPubMed ID21088226
||Long SP, Zhu XG, Naidu SL, Ort DR (2006) Can improvement in photosynthesis increase crop yields? Plant Cell Environ 29: 315–330 & Zhu XG, Long SP, Ort DR (2010) Improving photosynthetic efficiency for greater yield. Annu Rev Plant Biol 61: 235–261PubMed ID17080588, 20192734
||"Photosynthesis is a relatively inefficient process,
with only a maximum of 8% to 10% of the energy in
sunlight being converted to the chemical energy in
reduced sugars (primary sources).
Further considering carbon losses from autotrophic
respiration and limitations by other factors such as
water and nutrient limitations, realized conversion
efficiencies are typically just 2% to 4% of the energy
received in sunlight (BNID 110843, primary sources)."