Journal
SCIENTIA HORTICULTURAE
Volume 119, Issue 2, Pages 193-196Publisher
ELSEVIER
DOI: 10.1016/j.scienta.2008.07.013
Keywords
Leaf senescence; Nitrogen uptake efficiency; Remobilization; Reserve nitrogen
Categories
Funding
- Brain Korea 21 project
- Institute of Agriculture & Life Science, GNU
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This study was conducted to understand the effect of N supply in autumn on its uptake and distribution in tree parts and the utilization of reserve N the following year in persimmon trees (Diospyros kaki cv. Fuyu). The treated trees received 22.5-g N each for two successive years as a 3.5% urea solution from September 18 at 5-day intervals. Trees absorbed about 30% on average of the N applied in autumn. Sixty four to 83% of the N absorbed in autumn was in perennial parts, and 65-72% of that was in roots. Total N in perennial parts of the tree fertilized with N increased by over 4.28 g while leaf N changed little during senescence, indicating that the reserve N was constituted mostly by the N absorbed in autumn. Total N in the new growth was about the same as the amount of N declined in spring from perennial parts, indicating that there was little contribution by soil N to sustain new growth. Total dry weights of new growth the following year in a with-N tree were greater by over 34 g than those in a without-N tree. (C) 2008 Elsevier B.V. All rights reserved.
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