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A Computer Simulation of Fe(III) and Fe(II) Complexation in Nutrient Solutions: II. Application to Growing Plants

Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506

W. L. Lindsay

Dep. of Agronomy, Colorado State Univ., Fort Collins, CO 80523

* Corresponding author.

ABSTRACT

A computer model developed by the authors accurately predicted the chelation of ferrous and ferric ion as a function of pH and redox potential in nutrient solutions. Experiments were conducted to establish the apparent redox potential (4 < pe + pH < 7) imposed by roots of efficient and inefficient soybean plants (Glycine max L.). Using this information, equilibrium Fe²⁺ concentrations were controlled by adjusting the concentrations of the chelating agents. Iron-59 uptake was correlated with log[Fe²⁺] for concentrations between 10^–6.5 and 10^–9.2 mol Fe²⁺/L in the experimental nutrient solutions.

Joint contribution from Colorado and Kansas Agric. Exp. Stn. Kansas Agric. Exp. Stn. no. 88-257-J.

Received for publication December 21, 1987.