Abstract
1. The stomatal index and the stomatal aperture of cabbage laves increased in the order of 60%, 40%, 80%, 20% and 100% plots for the saturation of the soil water. The maximum dimensions of the daily stomatal aperture were shown between 10 a. m. and 2 p. m. in all plots, but the opening hours of the stomata was prolonged in the same order as above. 2. Osmotic values of the cell sap in the leaves measured by means of the plasmolytic method, and the transpiration rate experimented by the cobalt chloride method, and the assimilation rate measured by the leaf punch method were also shown in the same order mentioned above. And osmotic values were higher at night and in the forenoon than at daylight and in the afternoon. The amount of the water lost by transpiration was less at night than at daylight. From above results we emphasize that the transpiration and the assimilation ratio and osmotic values of cabbage were closely related to the stomatal index and its daily aperture were subjected to various soil moisture.
