STUDIES ON THE DROUGHT RESISTANCE OF SUGAR-CANE. : II. Effects of Manurial Elements to Drought Resistance of Seedling.

摘要

The author formerly reported on the drought resistance of sugar-cane seedlings and pointed out that potassium - content of seedlings and sets has some relation to drought resistance, especially the latter is closely related with root development. The present studies were carried out on the effects of manurial elements to drought resistance of seedling. The results are summarized as follows. (1) Nitrogen decreases drought resistance of seedling and potassium increases it. Effect of phosphorus on drought resistance seems not so distinct. (2) Decreasing of drought resistance by nitrogen is due to the exceeding growth of seedling to root development and to lowering colloid-content, electrical conductivity, viscosity of cell sap of seedling and to high osmotic pressure of seedling-set. (3) Increasing of drought resistance by potassium is due to remarkable effect upon the root development and to increasing colloid-content, osmotic pressure, electrical conductivity and viscosity of cell sap of seedling.