The expansion of the buckwheat area is planned in Ogimi village, but some farmer's fields showed lower buckwheat yield. Therefore, choosing fields suitable for buckwheat is important. From site investigation, we found that fields with discontinuous and discontinuous buckwheat cultivation formed several clusters. Thus, this study is intended to develop a land classification method for finding suitable fields for buckwheat in Ogimi village. For developing the method to find suitable fields, we focused on spatial hierarchy of agricultural land, namely, regions, fields block, and fields in order from wide to narrow range. The survey and data analyses were performed separately for these three spatial hierarchy units. In the regions survey, topography and soil data were collected. Also, data of agricultural land improvement were collected in fields blocks survey, while physical and chemical soil feature were collected in the field survey. Analyzing of the data obtained thorough these hierarchal surveys suggested that the region should be classified at first according to their topography groups. The regions classified to topography group I and II, where fields conditions are humid, are not suitable for buckwheat cultivation, whereas those classified topology group III and IV, where fields condition are dry, are suitable for its cultivation. Here, we could propose the fundamental land classification method to find suitable fields for buckwheat cultivation in Ogimi village. To extend this method to other districts or other crops, it would be effective to collect and analyze data considering spatial hierarchy as performed in this study.
