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Keywords:

  • Droop equation;
  • Liebig;
  • Monod equation;
  • nutrient productivity;
  • nutrient proportions;
  • relative growth rate;
  • nutrient concentration

Abstract I propose that one single formulation can be applied to relate growth and content of several nutrients, including the most important macronutrients, of most plant species. The plant growth rate is proportional to the nutrient content minus a given minimal concentration of the nutrient in minimum. The proportionality factor, the nutrient productivity, and the minimum concentration are species specific properties. The nutrient productivity formulation is shown to apply for very different plant species and for different nutrients.