1974 年 38 巻 4 号 p. 32-37
1) Growth of sample trees (Ginko biloba L. and Camellia japonica L. var. hortensis Makino f. otome Makino) Planted in highly solid ground is unsatisfactory as far as the parts above ground is concerned, and as years go by this becomes more remarkable, while the contrary is observed among trees planted in less solid ground.
2) As for the parts nnderground, though growth is not satisfactory, in highly solid ground, roots are seen growing more extensively than one expects. Also, the rate of underground development underground parts/whole (except flowers and leaves) is great. In the meantime those planted in less solid ground extend their roots well, but the rate of underground development is small.
4) In case of Ginkgo biloba L. those planted in highly solid ground shed their leaves early, while those planted in less solid ground shed theirs late. In case of Camellia japonica L., var. hortensis Makino f. otome Makino those planted in highly solid ground put out ower buds fairly well while they are yound, and those planted in less solid ground put them out quite well.
4) As to the moisture in soil, in highly solid ground soil easily dries. Even after rain, it contains a big amount of water only for a short while and quickly dries up. Soil in less solid ground holds water fairly well.