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A method for controlling the activities of free metal, hydrogen, and phosphate ions in hydroponic solutions using ion exchange and chelating resins

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Summary

An ion exchange and chelating resin system was developed to buffer the activities of selected free cations and phosphate in hydroponic solutions at concentrations similar to those that occur naturally in soil solutions. Free-ion activities of Cd, Cu, Ni, Zn, Mn, H, Ca, Mg, and K were maintained by ion exchange and chelating resins in a controlled ionic strength system. Iron was controlled by EDDHA and chelating resin, and P by a cation-exchange resin containing adsorbed polynuclear hydroxyaluminum. This mixed-resin hydroponic system was used to establish a range of ionic Cd activities similar to that found in soil solutions of soils amended with sewage sludge. Activities of other nutrients were maintained at realistic soil-solution levels. A metal complexing agent (EDTA) was used to increase total metal concentration in the hydroponic solutions without significantly altering the ionic activities of the metals maintained in solution. This allowed differentiation of the effects of free ions and complexed metals on metal uptake. Concentrations of metal complexes in solution were controlled by the ion activities of the metals maintained and the concentrations and selectivities of the complexing agent. The mixed-resin system supplied sufficient nutrients for the growth of tomato plants (Lycopersicon esculentum, cv. Wisconsin-55) in hydroponic culture.

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Author notes

  1. R. T. Checkai

    Present address: US Plant Soil and Nutrition Laboratory, Cornell University, Tower Road, 14853, Ithaca, NY, USA

  2. L. L. Hendrickson

    Present address: Enichem Americas, 08544, Princeton, NJ, USA

Authors and Affiliations

  1. Department of Soil Science, University of Wisconsin-Madison, 53706, Madison, WI, USA

    R. T. Checkai, L. L. Hendrickson, R. B. Corey & P. A. Helmke

Authors
  1. R. T. Checkai
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  2. L. L. Hendrickson
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  3. R. B. Corey
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  4. P. A. Helmke
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Additional information

Research supported by the College of Agricultural and Life Sciences, University of Wisonsin-Madison and by United States Environmental Protection Agency through Grant CR807270010.

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Checkai, R.T., Hendrickson, L.L., Corey, R.B. et al. A method for controlling the activities of free metal, hydrogen, and phosphate ions in hydroponic solutions using ion exchange and chelating resins. Plant Soil 99, 321–334 (1987). https://doi.org/10.1007/BF02370878

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  • DOI: https://doi.org/10.1007/BF02370878

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