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The effectiveness of spraying foliage with urea to provide nitrogen (N) to augment the seasonal internal cycling of N in young nectarine trees ( Prunus persica  (L.) Batsch var.  nectarina  (Ait. f. Maxim.), cv. Stark Red Gold) was studied. One-year-old trees were grown with contrasting N supplies during the summer and foliage was sprayed with a 2% urea solution labeled with  15 N just before leaf senescence started. After leaf abscission had finished, the trees were repotted in sand and given no further N. Remobilization of both labeled and unlabeled N for leaf growth the following spring was quantified.

Storage of foliar-absorbed nitrogen and remobilization for spring growth in young nectarine ( Prunus persica var. nectarina ) trees