On the nursery selection by means of the number of tillers in wheat breeding experiment. : (1) Experimental results of fixed variety.

[摘要] The number of head is the most important factor in the snowy district for producing wheat and barley. And the correlation between the number of tillers at the seedling stage and the number of heads at the maturity as a varietal difference has been stated by many investigators. But the relations with the individual plants on a same Variety or the breeding strains have not yet been studied by the new method of statistics. The value of nursery selection has been examined for the purpose of saving trouble and experimental farm as a matter of breeding process. In the first the result on the fixed variety was described and in the second regarding the strains of third filial generations from dissimilar combinations of two were given. The result on the fixed variety was stated in this paper. The variety used in this study is "Norin No. 24" which is resistibility against snow damage and a type of habit having many tillers and heads, and the grad was sorted in 5 classes according to the number of tillers about the individual plants at the nursery plat, viz. the number of stems of each classes of series are as follows : 1, 2, 3, 4 and 5 or 6. The relations between the number of tillers when they were transplanted from the nursery plat and the length of culm at the maturity are judged with hightly significant respectively. The relations between the number of tillers at the transplanting time and the number of heads at the maturity are resulted as follows : there are hightly or slightly significant 1 or 2 to over 3 stems, however, amongst over 3 stems obtained not significant respectively. All of the result of this study has been conducted by Fisher's method.

[学科分类] 农业科学（综合）