(I) Studies on the Causes Relating to the Difference of Dry Matter Content of Sweet Potatoes : (11) The relation between daily changes of osmotic pressure in different parts of sweet potatoes, particulary in root-tuber and dry matter content

[摘要] The experiments were made to know how the differences of daily changes of osmotic pressure are between varieties which have high dry matter content and those of low dry matter content. Generally the osmotic pressure increases in the morning and decreases in the afternoon, but the osmotic pressure in the varieties having high percentage of dry matter content (Norin 1, Genji, Gifu 1) drops rather gradually in the afternoon, while those having low percentage of dry matter content (Okinawa 100, Chabo, Ibaraki 1) show a sudden drop in the afternoon or no increasing from the beginning and a gradual falling. Osmotic pressure in the varieties having middle dry matter content was proved apt to be intermediate between two groups above mentioned. From these results it was made clear that the daily changes of osmotic pressure in the varieties having high percentage of dry matter are quite different from those of varieties having low percentage of dry matter content.

[学科分类] 农业科学（综合）