Seasonal Trends of Calcium, Magnesium, and Potassium Fractions in Apple Leaf and Fruit Tissues1

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Abstract
Leaf and fruit tissues of apple (Malus domestica Borkh.) were sequentially fractionated using hot water, sodium nitrate, acetic acid, and hydrochloric acid to extract Ca, Mg, and K in various forms. Water-soluble and sodium nitrate-exchangeable Ca were considered physiologically active forms and increased from 50 to 84% of the total Ca in fruit during the season and decreased from 57 to 45% in leaves. About 90% of the Mg and K concentrations in fruit were physiologically active. Physiologically active forms of Ca, Mg, and K followed changes in total concentrations very closely, so that analyses of physiologically active fractions provide no increased accuracy for predicting physiological disorders.

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