Observation for Branch Stub after Pruning (III) : Changes of branch stub from 2 to 4 Years after pruning and knot analysis

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Other Title
  • 枝打跡の追跡調査団 (III) : 枝打後2 - 4年の枝打跡の変化と節解析
  • 枝打跡の追跡調査-3-枝打後2～4年の枝打跡の変化と節解析
  • エダウチアト ノ ツイセキ チョウサ 3 エダウチゴ 2 4ネン ノ エダウチ

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Abstract

We had researched about occlusion of branch stubs after prunning for the purpose of noticing the difference among the sickle, the hatchet, and the saw. In this paper, we discussed changes for encased parts of branch stub from 2 to 4 years after pruning, and results of the knot anaylsis about five sample trees. The results were as follows. 1) The ratio of occuluded branch stub used sickle was high such as 33.9%, and that of hatchet 81.0%, and that of saw 71.4% respectively, at the four years after pruning. 2) Judging from the knot analysis, it seemd that the discoloration of stem wood after pruning is caused by the splitting of annual rings, the severance at the convex branch base and peelig off inner bark. 3) It was observed that the occurrence ratio of bark pocket caused by the pruning used hatchet was slightly high than that of other tools.

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