Statistical Studies on Various Characteristics of Crop Plants : III. Varietal differences of morphological complex characteristics in rice when three planting spaces are putting together.

[摘要] According to the line previously reported (2, 3), studies on the varietal differences of the morphological complex characteristics in rice varieties were performed with the data from three planting spaces being put together. Namely, spacing between plants in the row was 5 cm, 15 cm and 25 cm, while the spacing between rows was 20 cm in the whole plots. All the other neccessary matarials and methods were in accordance with the previous experiments (2, 3). The results were as follows : (1) The complex charcteristics of rice varieties in the whole plots putted together can be shown by two principal components as indices of complex characteristics, the result being the same as in the 5 cm-plot in the previous paper (3). These indices of complex characteristics are : X1=0.457x1+0.123x2+0.293x3+0.368x4+0.499x5+0.490x6 X2=-0.296x1+0.529x2+0.613x3+0.494x4-0.064x5-0.091x6 (2) The meaning of these indices is as follows: The first index is mainly concerned with the per plant yield of the variety. The difference in the first index is attributable to the difference of planting spaces. The second index is mainly concerned with the plant type which were whether it is a long-culmed, heavy panicle-type or a short-culmed, tillering type, the meaning of this index being the same as in the first index in the 5 cm-plot. (3) The plant type shown by the second index of complex characteristics was changed by difference of planting spaces, and there were three types in these changes. One of the reasons of these changes was mentioned.

[学科分类] 农业科学（综合）