Justus Liebig 1803-1873
The total yield or biomass of any organism will be determined by the nutrient present in the lowest (minimum) concentration in relation to the requirements of that organism.
"The limiting nutrient is the one in least abundance."
In aquataic ecosystems, Phosphorous is usually limiting.
If the limiting nutrient is supplied in abundance, then Liebig's law states that
the next least-abundant nutrient will become limiting, and if the needs for that
nutrient are then met, then the next least-abundant nutrient will become limiting.