Statistical researches on bad harvest of rice in Japan : (5) Characteristics of the trans-mode percent in each of three bad harvest types

Abstract

In the present paper, the author reported that the correlation coefficients between the trans-mode percentage and other eight items picked out from the former reports, Were high in Hokkaido and low in S-W type as shown in Taple l. From the correlation diagram, Fig.1, there was observed only one regional linkage group which was linked into a line with Aomori, Miyagi, Iwate and Yamagata Prefectures, which lie in the north along the Pacific Coast of the N-E type, and no other regionally linked groups were not seen, but some topographically correlated groups might be inferable.It Was concluded that the regional likage group is a regionality formed in bad harvest region, located at high latitudes, where rice plants suffeted frequently of a single limiting factor such as cool temperature, and that the topographically correlating group is another regionality formed in bad harvest regions, located at lower latitudes, where bad harvests are presumably derived from numerous factors. Therefore, the bad harvest may be said to come from Okhotsk Sea in Hokkaido, and from Pacific Ocean in the northern N-E region, but such a definite way for bad harvests is not found in the regions of S-W type.