Prebloom calcium chloride or lime sprays on Spartan apple (Malus pumila Mill.) trees did not increase fruit calcium levels or decrease breakdown incidence. Boron applied in summer with calcium sprays did not decrease breakdown incidence or increase fruit calcium levels beyond the effect of the calcium sprays alone. Strontium sprays did not affect the incidence of breakdown in Spartan apples.
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Lidster et al. (1978) studied this question.