Prediction of the Harvesting Time for Four Apple Cultivars On the Basis of Beginning of Flowering and Attaining of T-Stage of Fruitlets and Dependence of Diameter of Fruitlets at T-Stage and Fruits at Ripening Stage

The growth of fruits was evaluated during three growing seasons on four apple cultivars ‘Angold’, ‘Jonagold’, ‘Rubinola’ and ‘Topaz’. The follow-up period was defined by the start of flowering, the date of attaining of T-stage by fruitlets and the start of optimal harvest ripening, which for each cultivar was determined on the basis of starch index, flesh firmness and soluble solids. The close relationships were detected between time of attaining the T-stage and term of harvest maturity for three of four studied cultivars.