Abstract
Using the data of the performance test for recommendable varieties in Toyama Prefecture, the influence of the environments (year, Iocation) on the yields of the rice varieties was analyzed during the 10 year-period from 1961 to 1970. These data were divided into 3 periods, and common varieties and locations were extracted (Table 1). The variances of the main effects and the interactions of the factors were examined by analysis of variance at each period, and then, the adaptability and the features of each variety were evaluated by FlNLAY and WILKlNSON (1963)'s regression analysis, principal component analysis (PCA) and cluster analysis.
