Abstract
(1) Soil survey and survey of the development of fruit trees or forest trees were made at some places in the village of Nishi and Shikai, Shodo Gun, Kagawa Prefecture. These places were of two kinds, the one of which was presumed to be tales gloscier or talus and the other was in marked contrast with the former regarding topography and soil profile.
(2) Because of presumably the block structure of the soil, the root of olive tree penetrated to a depth of 1 meter in the II Horizon notwithstanding the highly clayey texture of the soil which originated from metamorphic clayslate, in the Oki Island. On the hill of Oe the roots of olive tree penetrated more deeply than in the of Oki Island and the maximum depth was recorded to be 1.45 meters. It was supposed that there is close relation between the root development of olive trees and the soil moisture.
(3) The fact that the roots of olive trees in Mr. TAKAHASHI'S olive grove in the village of Nishi penetrated shallowly into the soil was supposed to be a case of the phenomenon due to so-called“Leachy Substrata”.
