Blackman Law of Limiting Factors

Blackman gave the statement that ‘when a process is conditioned as to its rapidity by a number of separate factors, the rate of the process is limited by the pace of the slowest factor.’ This means that when any process is regulated by more than one factor, then the rate of the process will be determined by the factor which has the minimum value among all factors. This minimum value factor is directly proportional to the rate of the process being governed.

For instance, in the green leaves under optimum light intensity and temperature, with low levels of carbon dioxide concentration, the photosynthesis rate may falter unless optimum CO2 levels are achieved.