STUDIES ON THE ANALYSIS OF DROUGHT DAMAGE ON PADDY RICE PLANTS. : (III) Metallic Elements and Drought Resistance.

[摘要] In 1950 spectro-analysis was carried out to the plants and soil in the experiments of the previous year. (Cf. the secondary report.) The results are summarized as follows: 1. Parallel relation was recognized between the drought resistance and the volume of the particular metallic elements absorbed in drought condition. Especially in nondrought-resistant varieties, important metallic elements such as Fe, Ca, P, etc. were detected less in the drought condition. 2. Almost the same results were obtained as for the disease resistance to the panicle-neck rice blast. 3. "Cu" element seems to play some important physiological parts of a rice plant as well as other essential elements, recognizing the fact that it was contained considerably in every part of a rice plant like essential elements. 4. Metallic elements were contained most abundantly in roots and next in underground stems as follows; essential elements-Fe, Ca, Mn, P and complementary elements-Al, Ti, Ba, Zr, V, Be. Especially the latter elements were contained more in roots and bases of underground stems than other parts. By this fact those elements seem to play some important parts as for absorption of nutrients of rice plants. 5. In unpolished rice kernels "K" and "Mg" elements were contained conspicuously more than in other parts of rice plants. This fact suggests that those elements have important physiological meanings in young rice plants.

[学科分类] 农业科学（综合）