Statistical Studies on Various Characteristics of Crop Plant : V. Varietal difference of a morphological characteristic of rice plants when three plant-spacings and three nitrogen levels put together

摘要

In this paper, studies on the varietal differences of a morphological characteristic of rice variety were carried out considering all plant-spacings and nitrogen levels together. The present results were as follows: (1) The morphological characteristic of rice variety could be shown by two principal components which were indices of the morphological characteristic. X1= 0.459x1+0.186x2+0.309x3+0.374x4+0.515x5+0.505x6, X2= -0.391x1+0.300x2+0.645x3+0.536x4-0.136x5-0.187x6 (2) The meaning of these indices was entirely the same as in the previous papers (4, 5), and the first index was concerned chiefly with the yield of an individual plant. The second index was concerned chiefly with the plant type whether it is a long culm, heavy panicle one, or short culm, high tillering one. (3) The plant type showed by second index varied with plant-spacings at each nitrogen level, and these variations can be classified in to three types as mentioned in the previous papers (4, 5). At the same time, the plant type varied with nitrogen level at each plant-spacing, and in these variations several pattern can be seen as given at the figure in page 184.