The interrelationships were studied between local soil N availability, tree N status, and
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uptake capacity of excised roots of mature, commercially grown `O'Henry' peach trees. Nitrogen sufficient (+N) and deficient (–N) peach trees were established previously by differential N fertilization. High (+N) and low (–N) soil microsites were established under +N and –N trees in June 1994. Per unit root length
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uptake capacities of roots excised from +N and –N microsites were measured in late July 1994. Root excised from +N microsites exhibited higher
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uptake capacity per unit root length than roots from –N microsites irrespective of tree N status. The relationship of these data to the concept that
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uptake is a function of sink N demand will be discussed.