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15 NH 4 15 NO 3, nitrogen-use efficiency, fertilizer, nutrient budgets, lysimeters ABSTRACT. 15 Nitrogen uptake, allocation, and leaching losses from soil were quantified during spring, for 4-year-old bearing 'Redblush' grapefruit ( Citrus x paradisi Macf.) trees on rootstocks that impart contrasting growth rates. Nine trees on either the fast-growing 'Volkamer' lemon (VL) (C. volkameriana Ten & Pasq.) or nine on the slower-growing sour orange (SO) (C. aurantium L.) rootstocks were established in drainage lysimeters filled with Candler fine sand and fertilized with 30 split applications of N, totaling 76, 140, or 336 g·year -1 per tree. A single application of double-labeled ammonium nitrate ( 15 NH4 15 NO3, 20% enriched) was applied at each rate to replicate trees, in late April. Leaves, fibrous roots, soil, and leachates were intensively sampled from each treatment over the next 29 days, to determine the fate of the 15 NH4 15 NO3 application. Newly developing spring leaves and fruit formed dominant competitive sinks for 15 N, accounting for between 40% and 70% of the total 15 N taken up by the various treatments. Large fruit loads intercepted up to 20% of this 15 N, at the expense of spring flush development, to the detriment of overall tree N status in low-N trees. Nitrogen supply at less than the currently recommended yearly rate of 380 g/tree exceeded the requirements of 4-year-old grapefruit trees on SO rootstock; however, larger trees on VL rootstock took up the majority of 15 N from this rate over the 29-day period. Nitrogen-use efficiency declined with increasing N rate, irrespective of rootstock. The residual amounts of 15

Springtime 15Nitrogen Uptake, Partitioning, and Leaching Losses from Young Bearing Citrus Trees of Differing Nitrogen Status