ボラ地帯の耕地整備に関する基礎的研究

概要

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In some part of south Kyushu, there are areas in which subsoil layer of the fallen pumice-stone, called Bora, is deposited. This layer deprives the productivity of farm land. In about 1960,the farm land improvement removing Bora was performed in some areas, and since then the productivity of farm land has been on rising. On the other hand, owing to the heap consisting of the removed Bora, the farm land was decreased the area, divided into small blocks, the improvement of the labor productivity being prevented. As a solution of the above mentioned problems, we designed a means of re-improvement in which the Bora crushed and mixed with field soil, have performed some fundamenntal studies for the purpose. That is, in addition to the investigation for physical and mechanical properties of Bora, we investigated the physical properties of the field soil, mixed soil and the crushed Bora. Then pot-culture tests using hill rice were done in regard to these 3 sorts of soil. Consequentially, it was ascertained that the possible growth of hill rice was to be maintained under the condition that the content of the crushed Bora mixed should be checked below about 50%.
鹿児島大学の論文
1974-03-20