A rapid method for determining firmness of fruits of sweet cherry ( Prunus avium L.) using the Ottawa Texture Measuring System is described. Firmness was determined by averaging the mean slope of force-deformation curves for 15 individual cherries per replication. Fruit of intermediate maturity was less from (P < 5%) than more immature or mature fruit Three Ca sprays applied prior to harvest firmed fruit (P < 5%) at harvest. Cherry bioyield and deformation values were not significantly influenced by fruit maturity or CaCl 2 sprays at harvest
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Lidster et al. (1978) studied this question.