According to Blackman’s law of limiting factor, at any given time, photosynthesis can be limited by

According to Blackmans law of limiting factor, at any given time photosynthesis can be limited either by light or ${\mathrm{CO}}_2$. Blackman proposed the law of limiting factors in 1905 to determine the rate of photosynthesis. According to this law, when a process depends on a number of factors, its rate is limited by the pace of the slowest factor.