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The uptake efficiency of apple scions and rootstocks has not been studied in the field. Using  15 N (ammonium nitrate, 1 atom %  15 N) we compared nitrogen uptake efficiency of 12 rootstocks grafted to one scion (Gala) and of 20 scions on the same clonal rootstock (M.9 EMLA) in orchards located in northeastern Wisconsin. Trees were treated in either Fall or Spring 1998 with 40 g actual N per tree applied as a liquid to the soil. N uptake was assessed by measuring  15 N in leaf and wood tissue taken monthly from June to Oct. 1998. Tissues were oven-dried and analized using a ratio mass spectrometer. Treatment differences were greater among scions with the same rootstocks than among rootstocks with the same scion. Total N and  15 N content differences were found between roostocks and these values were inversely related to tree size.

614 Nitrogen Uptake Efficiency of Apple Rootstocks and Scions