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,'h/thtio,ia/ itilc'v iiorc/s. IJidrangc'a ;uac;'opinI(a 'Berlin'. Abstract. Rooted liners of Iit'drangea iiacrophrlla (Thunb.) Ser. Berlin' were fertigated with different rates of nitrogen (N) l'rorn ink to Sept. 2007 and leaves were spra yed with "N-labeled urea in late October to evaluate urea uptake anti ' 5N translocation by hydrangea leaves in relation to plant N status. Four plants from each N ferfigation rate were harvested before the y were spra yed with urea and 2, 5, 10, and 15 da ys after urea spray. Increasing rate of N ferfigation increased plant N content in October ' before being sprayed with urea. Leaves rapidly absorbed I5\ from urea spra y. The highest rate of '5N uptake occurred during the first 2 days after urea spray anti then decreased. Export of 'N from leaves occurred rapidly after uptake and the highest rate of ' 5N export occurred during the first 2 da ys after urea spra y anti then decreased. During the first 5 days after urea spray. the rate of ' 5N uptake by leaves and export from leaves decreased with increasing rate of N fertigation. On a whole plant basis, the total amount of 'N from foliar ' 5N—urea spray increased sitii increasing rate of N fertigation; however, the percentage of 'N exported from leaves and the percentage of N that derived from foliar ` 5N—urea spray decreased with increasing rate of N fertigation. Results suggest that hydrangea plants with lower N status in the fall are more efficient in absorbing and translocating N from foliar urea than plants with higher N status.

Nitrogen Uptake and Mobilization by Hydrangea Leaves from Foliar-sprayed Urea in Fall Depend on Plant Nitrogen Status