Root storage of nitrogen applied in autumn and its remobilization to new growth in spring of persimmon trees (Diospyros kaki cv. Fuyu) |
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Authors: | Young Kee Kim Chae Shin Lim Seong Mo Kang Jeong Lai Cho |
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Affiliation: | 1. Department of Horticulture, Division of Applied Life Science, Gyeongsang National University, Jinju 660-701, Republic of Korea;2. Institute of Agriculture & Life Sciences, Gyeongsang National University, Jinju 660-701, Republic of Korea |
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Abstract: | 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. |
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Keywords: | Leaf senescence Nitrogen uptake efficiency Remobilization Reserve nitrogen |
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