Correlations Between Nutrient Concentrations in Leaves and Quality of Fruit in Seedless Wampee

The seedless wampee, Clausena lansium, in Yunan of Guangdong province was used to study the relationships between the N,P, K, Ca and Mg concentrations in the leaves and fruit yield and quality. The simple correlation analyses showed that correlations between nutrient concentrations and fruit quality were different among phonological phases. During bud differentiation stage, there was a significant negative correlation between the N or K concentrations and fruit acidity. The Ca and Mg concentrations were highly positively correlated with vitamin C, and Ca concentration was significantly correlated with fruit soluble solid. The concentration of K was highly negatively correlated with soluble sugars. The Mg concentration was significantly correlated with soluble solids and vitamin C. There was a positive correlation between K concentrations at flowering stage and fruit productivity. No significant correlation was observed between the nutrient concentrations in the leaves at fruit stage and fruit quality. At fruit developing stage, the concentration of K was negatively correlated with fruit soluble solids, while the Ca concentration was highly positively correlated with yield. During harvest stage, the N concentration was highly positive correlated with the soluble solids and soluble sugars. Canonical correlation analysis showed that the concentrations of Ca and Mg in leaves were highly correlated with fruit soluble solids and vitamin C.