KIM. Joon Ho (Dept. of Biology, Kongju Teacher`s College): The effects of urea nitrogen on the metabolism of plants. Ⅱ. The response of some nitrogen components of barley to urea and other nitrogen in water culture. Kor. Jour. Bot. V(2), 6-12. 1962. For the comparison with the previous paper (4) the present report deals with the absorption and metabolism of urea and other nitrogen ions in barley seedling absorbed through root. 1. The amount of nitrate in barley treated with urea reach it pcak on the 8 th day, NO_3 on the 4 th, NH_4 on the 6 th or 8th. respectively. 2. The ammonia content in urea group reaches its peak on the 6 th day but other groups on the 4 th day. The present data in the urea group show to shorten 4 days compared with that of the previous paper (4). 3. The content of total amide from the present data are gradually increased on all of the groups during this experiment. These are agreement with the result of the previous paper (4). 4. The alcohol soluble nitrogen in the urea group shows the similar tendency to the NaNO_3 group but reaches its peak 2 days later than in the (NH4)_2SO_4 group. 5. The content of total nitroaen in the urea series has the lowest amount at the beginning while the richest from the 4th day after. These would be explained on that the absorption of urea is delayed and the PH in the urea solution does not change, so called "physiological neutralily". The author should like to express his sincere thanks to Prof. M. J. Lee of Seoul National University for his valuable advices.