THE EFFECT OF FRUIT SIZE AND METHOD OF CALCIUM CHLORIDE APPLICATION ON FRUIT CALCIUM CONTENT AND BREAKDOWN IN SPARTAN APPLE

Abstract

Four sprays of 0.6% CaCl2, one spray of 2% or 4% CaCl2, and postharvest dips in 4% CaCl2 each decreased the incidence of breakdown in Spartan apple (Malus pumila Mill.). Fruit Ca levels were significantly increased by each CaCl2 treatment except the 2% CaCl2 spray applied 2 wk prior to harvest. The postharvest dip was more effective in increasing fruit Ca levels and decreasing the incidence of breakdown than the Ca spray applications in one orchard. Combining all three methods of Ca application resulted in the greatest increase in tissue Ca. A 4% CaCl2 spray or dip caused some injury to fruit from one orchard. Increases in fruit Ca content as a result of sprays or dips were consistently greater in fruit from one orchard than the other.