抄録
In order to study the agronomical capability of rice plants in differently transplanting cultivation, such as early, usual or late, the authors investigated changes of chemical components and morphological characters which constitutes their yields by controlling the number of tillers. The results obtained were as follows: 1) Rice plants transplanted early on paddy field were lower in the percentage of ripened grains and the grain weight, but more in number of tillers, as the result of it, they brought about the highest yields as well as the most numlerous panicles per unit area. The yield of the late transplanting cultivation was the least, because of a small number of panicles and the decrease of the percentage of ripened grains and the grain weight due to the delay of heading. 2) The percentage of ripened grains and the grain weight showed good results when rice plants were transplanted early with the controlled number of tillers. 3) Starch and total sugar percentages in leaf sheath were the highest in the early transplanted plants with the controlled number of tillers, and the carbohydrates were most easy to be translocated to the ears. On the contrary starch and total sugar percentages in leaf sheath were the lowest and nitrogen percentages the highest in the plants lately transplanted with the controlled and non-controlled number of tillers, and the carbohydrates were most hard to be translocated to the ears
