Nitrogen movement between trees in Japanese pear grafted by the joined-tree training system

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  • ニホンナシの樹体ジョイント仕立てにおける樹体間の窒素移行
  • ニホンナシ ノ ジュタイ ジョイント シタテ ニ オケル ジュタイ カン ノ チッソ イコウ

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Abstract

Joined-tree training creates a single, vertical main shoot by grafting together the stems of several adjacent trees. We used ^<15>N labeled ammonium sulfate to investigate the movement of nitrogen between the individual trees of Japanese pear that had been joined by this method. (1) In the grafted year, even if the graft had fully taken, only small amounts of nitrogen moved between trees. (2) When one of the tree stems was cut below the graft, or when nitrogen and water were not supplied to its roots, nitrogen was supplied to its upper stem and shoots through the graft from another joined tree or trees. (3) Several years after grafting, nitrogen applied to any of the root systems moved to the tip of the main shoot of other trees grafted into the joined tree.

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