抄録
In our last paper, we reported that a higher soil temperature (11°C) in winter promoted the vegetative and reproductive growth of wheat varieties. In the present paper, we elucidate the fact that the grade of such promotion is correlated with the grade of winter sowing habit of the variety. In this experiment, ten wheat varieties were used as material and were seeded in the containers on Dec. 1. 1958. The soil temperatures were adjusted with constant temperature tanks at 11°C and 6°C respectively from Jan.10 to Mar. 2. The results were as follows : 1. The rate of emergence of the leaves on main axis was promoted by the higher soil temperature, and the higher the grade of winter sowing habit of the variety was, the higher this grade of promotion was (Fig. 1). 2. The total leaf number on main axis was larger at 11°C and the grade of its increase was also correlated to the variety in the same way as that of emergence of leaves (Fig. 1). 3. The initiation time of ear primordia was hastened at 11°C and that grade was lower in the higher grade varieties of winter sowing habit (Table. 3). 4. The increase of shoots in winter season was promoted by 11°C treatment, but that in spring season was promoted by 6°C treatment, and these grades of increase were also related with the grade of winter sowing habit (Fig. 2)
