Young orange plants were supplied with N (15N-urea) by foliar fertilization. The leaves absorbed 52% of the N applied, 48 hours after foliar fertilization. In relation to the total N applied to the leaves of young orange plants, 38, 39, 23 and 15% were recovered in plants harvested 75, 120, 180 and 360 days after transplantating to pots, respectively. There were no significant effects of foliar fertilization on dry matter weight and amounts of N taken up during the first year after transplanting.
foliar fertilization; 15N; citrus; urea
