On the Tea Soils in Kyushu Region (Part 1)

Abstract

The morphological characteristics of repre-sentative profiles and general characteristics of the tea soils in Kyushu Region were investigated.From the soil survey, the characteristics of these tea soils were generally summarized as follows :1. The tea soils of Kuroki and Ureshino derived from diluvial and tertiary soils were red-brown or yellow-brown mineral soils, and their general characteristics were mainly governed by the contents of clay in soils.2. The tea soils of Izunii derived from diluvial soils were humic soils and their general characteristics were characterized by higher contents of humus in soils.3. The tea soils of Kumamoto, Makurazaki, Chiran, Miyakonozo and Kawaminami were humic allophane soils having the origin of volcanic ash.There were many types in mode of deposition of volucanic ash, that of Kumamoto soil was belonged to aeolian type and those of others were buried type. The general characteristics of these soils were characterized by much contents of humus and allophane in soils and in the tea soils of Kumamoto and Kawaminami the general characteristics due to contents of humus and allophane appeared distinct than those of other tea soils.4. The tea soils of Takachiho was brown mineral soils, but from the analytical results of these soils, it was seemed that the tea soils of this district were relatively influenced by volucanic ash soils.