SOME FACTORS AFFECTING UPTAKE OF CALCIUM BY APPLES DIPPED AFTER HARVEST IN CALCIUM CHLORIDE SOLUTION

Abstract
An inverse relationship occurred between fruit weight and increase in calcium (Ca) content in Spartan apples (Malus pumila Mill.) resulting from postharvest CaCl2 dips. The influence of fruit weight on Ca increase was greatest in tissue near the core. The addition of a thickener to the dip solution resulted in significantly higher flesh Ca levels. Ca absorption was significantly enhanced by treating with dip solutions which were colder than the fruit. Spartan apples absorbed less Ca from a postharvest CaCl2 dip than did McIntosh which absorbed less than Golden Delicious or Delicious. The use of a surfactant in the CaCl2 dipping solution did not affect Ca penetration into McIntosh or Delicious apples but decreased penetration of Ca into Spartan and Golden Delicious.

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