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Five age groups of trees were carried out in order to study relationships between the deterioration of Ponkan mandarin fruit quality and changes in tissues nutrient concentrations with tree age.Fruit quality and nutrient concentrations in fruits and leaves were measured.Comprehensive fruit quality decreased in the order:5-year-old > 13-year-old > 38-year-old > 8-year-old >18-year-old.In 18-year-old trees,calcium(Ca) concentrations of fruit and leaf were lower,while potassium(K) and boron(B) concentrations of fruit and magnesium(Mg) and manganese(Mn) concentrations of leaf were higher.Negative relationships were observed between fruit total soluble solids and leaf B,while positive relationships were observed between fruit total soluble solids and leaf and fruit Ca concentrations,and between titratable acidity and leaf Mn.Fruit quality decreasing with tree age most likely resulted from an imbalance of high K,Mg and B but lower Ca concentrations in leaves and fruits.
Five age groups of trees were carried out in order to study relationships between the deterioration of Ponkan mandarin fruit quality and changes in tissues nutrient concentrations with tree age. Fruit quality and nutrient concentrations in fruits and leaves were measured. Comprehensive fruit quality decreased in the order : 5-year-old> 13-year-old> 38-year-old> 8-year-old> 18-year-old.In 18-year-old trees, calcium (Ca) concentrations of fruit and leaf were lower , while potassium (K) and boron (B) concentrations of fruit and magnesium (Mg) and manganese (Mn) concentrations of leaf were higher. Negative relationships were observed between fruit total soluble solids and leaf B, while positive relationships were observed between fruit total soluble solids and leaf and fruit Ca concentrations, and between titratable acidity and leaf Mn.Fruit quality decreasing with tree age most likely resulted in an imbalance of high K, Mg and B but lower Ca concentrations in leaves and fruits.