The forecasting of polyphenolic substances in sweet cherry fruits under the impact of weather factors
Iryna Ivanova | Мarina Serdyuk | Vira Malkina | Tetiana Tymoshchuk | Anna Kotelnytska | Vira Moisiienko
It has been proved that during the period of research the weather factors had dominating effects on the formation of phenolic substances fund for the fruits of early and late groups of cultivars. The cultivar features affected the accumulation of the phenolic substances in the fruits of a group of cultivars of a medium-term ripening. It has been established that the fruits of 'Kazka' cultivar (203.17 mg 100 g–1) were selected from among the cultivars of an early-term ripening according to the average phenol substances content. The fruits of 'Rubinova Rannia' (175.27 mg 100 g–1) are characterized by the optimal variation indices as well as by the average content of polyphenolic substances. From the technological point of view, the most perspective from among the cultivars of medium- and late-terms of ripening was: 'Uliublenytsia Turovtseva' (226.85 mg 100 g–1), 'Udivitelna' (288.55 mg 100 g–1). The results of experimental analysis for the fruits of early- and late-terms of ripening as well as their dispersion analysis allow us to forecast the content of the phenolic substances by the average indices but not separately for every pomological cultivar. Based on designed regression models, the analysis of the degree of impact of each weather factor on the rate of the phenolic substance has been made. The humidity index (the average monthly amount of rainfalls in May) had maximal effects on the accumulation of phenolic substances fund for the cherry fruits of three terms of ripening. The humidity indices of the last months of fruits formation (May and June) had the greatest effects on the accumulation of phenolic substances for a test group of plants of all terms of ripening.
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