Manuring Experiments with Paddy Rice. 
(Second Year, 1890.) 
BY 
Dr. O. Kellner, Y. Kozai, Y. Mori, and M. Nagaoka. 
The principal purpose of the researches carried out by us in 
1889 and reported in bulletin No. 8 was to ascertain how much 
nitrogen, phosphoric acid, and potash can be consumed by rice 
from the stock of nutrients in the unmanured soil, and how 
much of them is needed in the manure for the production of a 
maximum crop if the three nutrients are applied in the most 
assimilable form. On the basis of the results then obtained, 
we partly continued in 1890 these experiments, partly we tried 
new ones, with the object of getting information on the follow¬ 
ing questions : 
I. How much nitrogen, phosphoric acid, and potash is taken 
up from those plots which had not received the respective 
nutrients in the preceding year ? 
II. What is the effect of unrecovered phosphatic manure on 
the succeeding crop ? 
III. How much nitrogen can be supplied to rice by the preced¬ 
ing cultivation of a leguminous plant (Astragalus lotoi- 
des, Lam.) for green manuring? 
IV. What is the effect of various phosphatic fertilizers on 
rice ? 
V. What is the effect of various nitrogenous manures on 
rice ? 
The arrangement of the experimental plots was the same as 
