Abstract
The author found the difference in drought resistance of sugar-cane seedlings from every stem nodes, that is seedlings from upper nodes are most strong, next are from lower nodes and those of middle nodes are weak for drought. Experiments were carried out in order to ascertain what character of seedling is effective for drought resistance. The results are summarized as follows. (1) Colloid-content of seedlings is large in those from upper nodes, next from lower nodes and small in those from middle nodes, corresponding with the degree of drought resistance. (2) Osmotic pressure of seedling-sets (part of stem, planted) varies inversely to drought resistance of seedlings. Low value of osmotic pressure of set seems convenient for water absorption of seedling at dry. (3) Potassium-content of seedlings and sets (before planted) is also corresponding with the degree of drought resistance of seedlings, especially the latter closely related with root development. (4) Viscosiy and electrical conductivity of cell sap of seedings also have some relation to drought resistance.
