Abstract
The effect of nitrogen upon both the yield and the alkaloid content of Datura Stramonium L. was investigated by aid of the solution culture and the greenhouse test with Iwatahara yellow soil under different nitrogen supply. (1) The highest yield was obtained at the highest nitrogen supply in the present experiment. (Table 1) (2) The total nitrogen content of the leaf, stem and root respectively increases with the increased supply of nitrogen, but that of the seed increases slightly. (3) With increased supply of nitrogen, the total alkaloid content of the leaf increases, increases in the root to some extent and then decreases, but decreases slightly in the seed. (Table II) (4) The total alkaloid content in the root, seed and stem respectively obtained with the solution culture remarkably differs from that of the greenhouse experiment.
