Abstract
Using the data of determining test of recommended variety of rice, the author tried to classify the plain part of baisin area in Yamagata prefecture into several groups by the application of the principal component analysis. Result of this investigation is following 1. The complex characteristics of two rice varieties in this investigation can be shown by three principal components as indices of complex characteristics. 2. The first index is concerned with whether type of the each place is a tiller-number type or a panicle-weight type. The second index is concerned with the yield on the each place and the third index, with plant height. 3. By the first index and the third index, each place could be classified clearly into the SHONAI and NATRIKU region, respectively.
