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Sweet cherry is an important crop, grown on all continents. A serious problem associated with sweet cherry cultivation is fruit cracking, occurring on rainy days during the ripening period. The yield loss caused by fruit cracking can be as high as 90%. The most common approach to reducing this adverse phenomenon is foliar fertilization with calciumcontaining preparations. Only a few studies have focused on the impact of this macronutrient on fruit quality and content of bioactive substances in them and physiological properties of the trees. The aim of this study was to evaluate the effects of calcium foliar supplementation on fruit yield quality and quantity, fruit susceptibility to cracking and on selected physiological parameters of sweet cherry. The study involved 14-year old sweet cherry trees of 'Burlat' cultivar, grafted onto 'PHL-A' rootstock. The trees were sprayed with InCa fertilizer (8.0% N, 13.0% CaO, and 1.0% Zn). The fertilizer was applied three times, at a dose of 1.5 dm3 ∙ ha–1. The first foliar fertilization was performed at the beginning of the flowering period, and the next two took place at fourteen-day intervals. By reducing fruit cracking, InCa used in foliar nutrition significantly increased marketable yield of sweet cherry, without changing fruit weight, size or antioxidant properties. Application of the fertilizer caused a reduction in total acidity (TA) of the fruit and increased TSS/TA (total soluble solids/total acidity) ratio. Foliar application of InCa fertilizer increased the content of chlorophyll a, total chlorophyll and carotenoids in the leaves of 'Burlat' cultivar. The foliar nutrition with InCa did not change CO2 assimilation rate, CO2 concentration in leaf intercellular spaces and the value of relative water content (RWC).

folia pomeranae universitatis technologiae stetinensis. agricultura, alimentaria, piscaria et zootechnica

THE EFFECTS OF InCa FERTILIZER USED IN FOLIAR NUTRITION ON YIELD QUANTITY AND QUALITY AND SELECTED PHYSIOLOGICAL PARAMETERS OF SWEET CHERRY CV. ‘BURLAT’