營養條件으로서 加里가 代謝過程의 活性化 乃至調整者라는 見地에서 加里供給水準과 生態的調整條件이라고 볼수있는 溫度週期性이 고구마 生育과 몇 가지 同位元素 動態에 미치는 影響을 살피었다. 礫耕培養下 低水準加里區(3m.e/ℓ)는 生長을 顯著히 抑制할 뿐아니라 末期에는 待異한 生長點 萎凋現象 등을 나타나게 하였다. 高水準加里區(14m.e/ℓ) 특히 暗期低溫區는 顯著한 草丈, 마디數, 生體重增大를 가져오고 窒素效果와 비슷한 營養生長促進生育相을 나타냈으나 含有窒素를 分析한 결과 低水準加里區가 平均 2.86∼3.23% 高水準加里區가 2.91∼3.41%로서 큰 差異를 나타낸 것으로 볼수없다. 따라서 高水準加里區의 營養生長促進型 誘導 특히 草丈促進은 加里가 窒素吸收를 促進한데 然由한것이 아니라 加里自體의 效果로 보인다. 低水準加里區에서는 塊根形成이 不能하였지만 高水準加里區에서는 營養生長促進生育相에 수반하며 窒素效果와는 달리 後期에는 塊根形成도 旺盛하였다. 高水準加里區中에서도 暗期低溫區에서는 더욱 營養生長促進傾向이 願著하고 暗期高溫區에서는 地上部對地下部比, 또는 塊根比가 越等하여 元來의 溫度週期性의 效果가 高水準加里에 依하며 變化된 것으로 보인다. 燐-32 加里-42의 個體當 吸收 및 吸收率은 高水準 加里區에서 顯著하고 特히 塊根形成期 및 塊根生成이 가장 旺盛한 區에서 增大되고 있나 p-32보다 k-42動態가 이點에 관하여 더 活潑한 것을 볼 수 있다. 低水準加里區에서는 P-32, K-42의 地上部로의 移動이 抑制되고 高水準加里區에서는 促進되고 있다. 즉 加里가 燐-32와 加里-42의 地上部轉移 特히 生長點으로의 轉移에 密接한 關係를 가지고 있다. 加里含量은 高水準加里區에서 높고 根伸長期보다 塊根形成期에 감에 따라 增加되고 있지만 燐酸含量은 別差異가 없고 나토리움含量은 加里와 對熙的으로 正反對의 傾向을 나타내고 있다. 加里는 溫度週期性의 關與下 고구마生長에 持異한 效果를 나타내고 또 P-32, K-42移動등 基本的 代謝過程에 關與하기 때문에 供給量이나 條件에 따라서 多樣的效果를 가질수 있는 營養要素라고 본다. 本硏究를 指導하신 趙伯顯原子力委員과 協調하여주신 國際原子力機構 및 加里硏究會에 深謝한다.

1. The experiment was carried out for investigating the interaction between potassium nutrition and thermoperiod (as an environment regulating factor) in relation to behaviors of several nutrients including phosphorus-32 and Potassium-42 in IPOMOEA BATAS. 2. To obtain same condition to trace the behaviors of phosphorus and potassum-42 they were simultaneously incorporated to roots. The determination of each CPM by counting twice with adequate interval and calculating true CPM of each isotope according to different half-life, was carried out with satisfactory. 3. Some specific symptoms i.e, chlorosis and withering of growing point under the condition of lower potassium level were found and was accelerated by the low night temperature. 4. A manganese shortage in growing point of the lower potassium level was found by activiation analysis and very low distribution ratio of phosphorus-32 and potassium-42 in the growing point of the lower potassium level was manifested, though the contents of nitrogen, phosphorus, potassium, sodium and magnesium were not in great difference. 5. In addition to the low water content with appearence of "hard," shorterning internode and lower ratio of roots to shoot as well as the symptoms of potassium deficiency such as brown spot in leaf blade and necrosis of leaf margin were appeared at later stage of experiment at the lower potassium level. 6. Very stimulating vegetative growth, e.g, large plant length, leaf expansion, increasing node number and fresh weight as well as high ratio of roots to shoot, high water content was resulted in the condition of higher potassium level. 7. A specific interaction between higher potassium level and thermoperiod was found, that is, the largest tuber production and the largest ratio of roots to shoot were resulted in the combined condition of higher potassium level and constant temperature while the largest plant length, fresh weight etc. i.e. the most stimulative vegetative growth was resulted in the combined condition of higher potassium level and low night temperature. 8. Comparatively low water content in the former condition of stimulative tuber production was resulted(especially at the tuber thickening stage), while high water content in the latter condition of stimulative vegetation was resulted though the higher potassium level made generally high water contents. 9. The nitrogen contents of soluble and insoluble did not make distinct difference between the lower and higher potassium level. 10. Though the phosphorus contents were not distinctly different by the potassium level, the lower potassium level made the percentage of phosphorus increased at tuber forming stage accumulating more phosphorus in roots, while the higher potassium level decreased percentage of phosphorus at that stage. 11. The higher potassium level made distinctly high potassium contents than the lower potassium level and increased contents at the tuber forming stage through both conditions. 12. The sodium contents were low in the condition of higher potassium level than the lower potassium level and decreased at tuber forming stage in both conditions, on the contary of potassium. 13. Except the noticeable deficeney of manganese in the growing point of the lower potassium level, mangense and magnesium contents in other organs did not make distinct difference according to the potassium level. 14. Generally more uptake and large absorption rate of phosphorus-32 and potassium-42 were resulted at the higher potassium level, and the most uptake, and the largest absorption rate of phosphorus and potassium-42 (especially potassium-42 at tuber forming stage) were resulted in the condition of higher potassium level and constant temperature which made the highest tuber production. 15. The higher potassium level stimulated the translocation of phoshorus-32 and potassium-42 from roots to shoots while the lower potassium level suppressed or blocked the translocation. 16. Therefore, very