A study was carried out to determine the most effective nitrogen fertilizer application rate for optimal tree growth, fruit quality, and leaf mineral content of the young citrus 'Shiranuhi' ['Kiyomi' (Citrus unshiu Marcow × C. sinensis (L) Osbeck) × C. Total nitrogen concentration in the leaves increased with increasing nitrogen fertilizer application rate up to twice the standard application rate. However, no further increases in leaf total nitrogen concentration were observed in the N-application rate of three times the recommended rate. Lowering the nitrogen fertilizer application rate to half the recommended rate resulted in leaf total nitrogen concentration that was below the accepted content for optimal plant nutrition. From this study, the optimal annual nitrogen fertilizer application rate for 7-year-old 'Shiranuhi' trees appears to be between 224 kgN・ha −1 and 448 kgN・ha −1 .
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