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Emir. J. Food Agric. 2011; 23(5): 431-439

Effects of girdling, nitrogen, zinc and auxin foliar spray
applications on mandarin fruit ?Nova? quality characteristics

Peter A. Roussos? and Anastassios Tassis.

Four treatments were applied in young mandarin trees, variety ?Nova?, in order toassess their effects on fruit quality. The treatments comprised an untreated control, applications ofzinc plus nitrogen, post-bloom auxin application and pre-bloom girdling. At harvest the physicalquality characteristics of the fruits were measured (weight, diameter, length, peel thickness, juicecontent, peel color) along with juice quality characteristics (pH, total soluble solids, titratableacidity, phenolic compound content, antioxidant capacity and carbohydrates). Zinc and nitrogenas well as auxin application resulted in the heaviest fruits among treatments, while juice contentwas the lowest under control treatment. None of the treatments had a significant effect on maturityindex of the fruit. Girdling slightly increased the antioxidant capacity of the juice while decreasedpeel color index. Sucrose, glucose and fructose concentration was highest in fruits from girdledscaffolds, resulting in the highest sweetness index, while the lowest was observed under zinc andnitrogen application. It seems that all treatments enhanced fruit quality, but girdling had adistinctive and significant effect on most of the fruit quality characteristics assessed.

Key words: Antioxidant capacity, carbohydrates, fruit quality, phenolic compounds, triclopyr

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