抄録
This experiment was undertaken to determine the effect of nitrogen deficiency on the development of tillering bud in rice seedling by water culture method. Design of experiment and composition of nutrient solution are shown in table 1 and 2. Nutrient solution of nitrogen deficiency used for this study omitted the N-ion from the standard nutrient solution (shown in table 2). The results are summarized as follows; In the rice seedling which has been grown under nitrogen deficient condition since the seeding (of rice plant): 1. In case the plant was supplied with nitrogen since the early stage of the 3rd foliage leaf, the 2nd tillering bud grew well. 2. In case the plant was supplied with nitrogen since the early stage of the 4th foligage leaf, the development of the 2nd tillering bud was remarkably inhibited but the 3rd tillering bud grew well. 3. In case the plant was supplied with nitrogen since the early stage of the 5th foliage leaf, not only the development of the 2nd tillering bud but also that of the 3 rd one were remarkably inhibited, but the 4th tillering bud and the following 5th, 6th, 7th etc. showed remarkable growth. 4. In case the plant was grown under nitrorgen deficient condition throghout the whole growing periods of the plant, all the tillering buds in the plant were rested to grow. From these results, the rice seedling which was supplied with nitrogen after having been grown under nitrogen dificient condition in the early growth (of rice plant) it was concluded that the development of tillering buds by the differences of growing stages in the plant supplied nitrogen, were many differences as to the development of tillering bud in the plant, was differently affected in response to the period of nitrogen deficieney, especially the effects on the development of tillering buds in as such low stem-nodes as the 2nd and 3 rd etc. in main stem were remarkable.
