A Computer Simulation of Fe(III) and Fe(II) Complexation in Limited Nutrient Solution: I. Program Development and Testing Academic Article uri icon


  • The mechanism by which Fe-stressed roots increase Fe avaliability was determined with the assistance of a computer model that predicted the effects of redox and pH on the stability of Fe chelates. The program solves a series of simultaneous equilibrium equations to calculate the concentrations of all species in a nutrient solution containing Fe, Ca, and two competing chelating agents as a function of pH and redox potential. Experimental data were used to test the model. Model calculations based on results published by other investigators supported the theory that Fe-deficient soybean plants have the ability to lower the redox potential near their roots. It also showed that this phenomenon is the primary means by which iron-stresses plants are able to increase the availability of Fe.

author list (cited authors)

  • Schwab, A. P., & Lindsay, W. L.

citation count

  • 5

publication date

  • January 1989