Abstract
There are a large number of examples poor of growth of trees in Kabokurinen of Yumebutai (34 33' 30. 4N, 135 0' 30. 7E) north AWAJI-island in Hyogo. (Original planting was in 1998) It is necessary to investigate the cause of poor growth and to relate to future management plan. Therefore, the weather stations were set to establish the environment of the planting sites. Tree growth factors (height, canopy spread and girth) and soil (moisture, temperature and electric conductivity) were measured. Soil amending work was also carried out to recover the vigor of Cornus florida, over 2 months period, photosynthetic rates were measured to assess effect of soil amending work. Results show that, a large improvement was suitable for a poor water area. The other way around a small improvement was suitable for a rich water area. It is important for management to consider these factors.
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