Photosynthesis in the fleeting shadows: an overlooked opportunity for increasing crop productivity?

Although we cannot be certain that an improvement in photosynthetic efficiency will increase the yield, there is evidence for all four crops that an artificial increase in leaf photosynthesis by season‐long elevation of [CO 2 ] under open‐air field conditions results in highly significant increases in yield (Long et al. , 2006 ; Rosenthal et al. , 2012 ; Hasegawa et al. , 2013 ).

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