Use of labeled nitrogen to monitor transition in nitrogen dependence from storage to current-year uptake in mature walnut trees

@article{Deng2004UseOL,
  title={Use of labeled nitrogen to monitor transition in nitrogen dependence from storage to current-year uptake in mature walnut trees},
  author={Xiong Deng and Steven A. Weinbaum and Theodore M Dejong},
  journal={Trees},
  year={2004},
  volume={3},
  pages={11-16}
}
Nitrogen (N) derived from both the soil during current-year uptake, and the withintree pool of storage N was distinguished in two groups of “Serr” walnut trees using labeled fertilizer (15N-depleted ammonium sulfate) applied in different years. Mass spectrometric analysis of N in xylem sap collected periodically in spring allowed quantification of the relative contributions of N from storage and current season uptake and the transition in N usage from previously assimilated (storage) N to the… CONTINUE READING

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