| 摘要 |
PROBLEM TO BE SOLVED: To provide an underground supporting pole easily decomposed for meeting with the growth of the root part of a tree, since the materials of the underground supporting poles such as a metal, aluminum, belt, etc., wear semi-permanently and affect the growth of trees by cutting into roots on the elongation of the roots. SOLUTION: This underground supporting pole is provided by using mainly wood material 1, and therefore from approximately 3 years of its use when the roots of the trees take their roots, the strength of the wood material becomes week and the roots grow with decomposing the underground supporting poles. COPYRIGHT: (C)2005,JPO&NCIPI
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