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Assessment of the availability of ions to plant roots from the determination of their chemical activity in nutrient solutions



Assessment of the availability of ions to plant roots from the determination of their chemical activity in nutrient solutions



Journal of Plant Nutrition 10(5): 539-552



In soilless culture, the chemical composition of the nutrient solutions is usually expressed in terms of ion concentrations which do not reflect their actual availability to plant roots: even in aqueous media, the ions supplied as salts can give rise to complexes; furthermore, other kinds of ion interactions can be involved. The VEGACT model, developed from thermodynamic concepts used in geochemistry, affords a more reliable assessment of the energy level of the ions. Using a particular example, at equal concentrations, the roots are shown to take up potassium or nitrate ions more readily than calcium or phosphate ions. This model also affords the prediction of the possible occurrence of phosphate precipitation within nutrient solutions of a given composition.

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Accession: 001533179

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DOI: 10.1080/01904168709363590



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