抄録
According to the rice experiments previously reported, studies on the varietal differences in morphological complex characteristic of two-rowed barley varieties were carried out at Minamikawauchi Division, Tochigi Agrcultural Experiment Station. Thirty varieties of two-rowed barley were cultured under standard fertilization level, and plant spacing in this experiment was determined by seeding rate per are; namely, quantities of seed sowed were 0.4 kg, 0.8 kg and 1.2 kg per are, The following six characters were employed to obtain the indices of morphological complex characteristic: calm length (X1), panicle length (X2), number of panicle (X3), total weight per plant (X4), panicle weight of the longest stalk (X5), and panicle weight per plant (X6). The indices of a morphological complex characteristic were estimated by principal component analysis, which is one of the multivariate analysis. The present results were as follows : (1) A morphological complex characteristic of each variety at each plant spacing level can be shown by two principal components which were indices of the morphological complex characteristic. These indices were as follows; 0.4 kg/a plot X1=0.427x1+0.187x2+0.249x3+0.519x4+0.401x5+0.531x6 X2=-0.342x1-0.255x2+0.758x3+0.118x4-0.296x5+0.137x6 0.8 kg/a plot X1=-0.084x1+0.343x2+0.273x3+0.543x4+0.412x5+0.580x6 X2=-0.654x1-0.325x2+0.620x3+0.001x4-0.417x5+0.114x6 1.2 kg/a plot X1=0.332x1+0.259x2+0.208x3+0.526x4+0.414x5+0.576x6 X2=0.626x1+0.296x2-0.622x3-0.315x4+0.456x5-0.195x6 (2) The meaning of the first index in each plant spacing was mainly concerned with quantity of individual plant yield of variety at a given condition. (3) The meaning of the second index in each plant spacing was mainly concerned with the plant type whether the variety was a long-culmed, heavy-panicle type or short-culmed, tillering type. The sign of second index was, however, different in each plant spacing, namely short-culmed, tillering type varieties were plus sign in 0.4 kg and 0.8 kg per a. plots, but in 1.2 kg per a. plot it was minus sign.
