Calcium and Potassium Fertilization on Antioxidant Capacity and the Fruit Quality of ‘Hicaz’ Pomegranates (Punica granatum L.)

1 Mugla Sitki Kocman University, Horticulture Programme, Ortaca Vocational School, Mugla 48600, Turkey
2 Mugla Sitki Kocman University, Medicinal and Aromatic Plants Programme, Koycegiz Vocational School, Mugla 48800, Turkey
3 Mugla Sitki Kocman University, Biology Department, Mugla 48000, Turkey
4 Mugla Sitki Kocman University, Greenhouse Programme, Ortaca Vocational School, Mugla 48600, Turkey


GUNERI, M., M. YILDIZTEKIN, A. L. TUNA and I. YOKAS, 2016. Calcium and potassium fertilization on antioxidant capacity and the fruit quality of ‘hicaz’ pomegranates (Punica granatum L.). Bulg. J. Agric. Sci., 22: 591–599

This study was carried out in two different pomegranate (Punica granatum L.) orchards in the Mugla City of Turkey. The aim of the study was to evaluate the effects of calcium and potassium fertilizers on the fruit properties and total antioxidant capacity of pomegranate plants. 1.5% and 3% KNO3, 1.5% and 3% Ca(NO3)2, 0.75% KNO3 + 0.75% Ca(NO3)2 and 1.5%KNO3 + 1.5% Ca(NO3)2 were sprayed on the leaves. The Ferric Ion Reducing Antioxidant Power (FRAP), lipid peroxidation (Malondialdehyde – MDA) and Super Oxide Dismutase (SOD) parameters and fruit pomological properties evaluated after the treatments. Ca fertilization signifi cantly affected to the FRAP. Potassium treatments generally reduced the sugar content of the plants leaves. Considering fruit quality and pomological properties, the Ca treatments signifi cantly increased fruit weight, peel percent, juice yield and acidity. The K treatments higher affected fruit width and length, as well as the fruit peel percent; and Ca + K treatments increased acidity.

Key words: FRAP, fruit characteristics, MDA, Pomegranate, SOD
List of abbreviations: TUIK – Turkey Statistical Institute; Ca(NO3)2 – Calcium nitrate; KH2PO4 – Potassium phosphate; KNO3 – Potassium nitrate; FRAP: Ferric Ion Reducing Antioxidant Power; MDA – Malondialdehyde (Lipid Peroxidation); SOD – Super Oxide Dismutase; SAS: Statistical Analysis Software; TSS – Total Soluble Solids; TA – Titrable Acidity; ns – non-signifi cant

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