| 摘要 |
PROBLEM TO BE SOLVED: To provide a tree planting block requiring no fertilizer spray on a planting zone for a certain fixed period. SOLUTION: The tree-planting block 1 to be laid on a boundary of a tree-planting zone 140 has a hollow part 20 in its main body 10, in which hollow part 20, a fertilizer 30 of the tree-planting zone 140 is filled, and on a surface facing to the tree-planting zone when laid, at least one communicating hole 40 communicated with the hollow part 20 is formed. COPYRIGHT: (C)2006,JPO&NCIPI
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