Potassium fertilization arrests malate accumulation and alters soluble sugar metabolism in apple fruit.

A decreasing trend of Ca levels was observed in both K2- and K3-treated fruit, which was different from the trend in K0- and K1-treated fruit.

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At the same time, the sucrose and fructose levels showed an increasing trend, but there was no significant difference among treatments.

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In the present study, titratable acid levels showed a trend of rapid decline from 56–126 DAB across all treatments ( Fig. 1 ).

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