Abstract
Abstract The interactions between Mg, K and Ca in leaves of ‘Spartan’ apple and ‘Bing’ cherry were studied in relation to the expression of Mg deficiency symptoms. Results of sand culture and field experiments indicate that Mg analyses alone may permit reliable assessment of the severity of Mg deficiency in tree fruits, and that this assessment is not significantly improved by the use of cation ratios. Regression equations were used to relate per cent leaf Mg to symptom expression (the index of the severity of deficiency). Little response to soil applied Mg was obtained on young ‘Spartan’ and ‘Bing’ trees. No mutual antagonism between leaf K and Mg was observed in ‘Spartan’ apple and only a one-sided effect of K on Mg in ‘Bing’ cherry. K applications increased the severity of Mg deficiency symptoms in all experiments, however.
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