2 
MANURING EXPERIMENTS WITH PADDY RICE (THIRD YEAR). 
I—2 days and the water allowed to drain off from the plots. 
Towards the end of September the irrigation was discontinued, 
and water was afterwards given only for two days when the rice 
was in blossom. The weather, though not so very favorable 
as in 1890, continued to be good throughout the season; no 
injuries were noticed, and the yield in our vicinity was in 
general regarded as medium good. On the 10th of November 
the rice was cut and dried in the air. 
Each trial was carried out in triplicate. 
I. Series. Researches on the exhaustion of soil nutrients 
(nitrogen, phosphoric acid, and potash) 
in the third year. 
Carried out in conjunction with 
S. Ucliiyama and T. Yamada. 
These experiments were carried out on 15 plots divided into 
5 groups of 3 plots each, which had already served for the same 
purpose in the two preceding years. Our intention was, as 
already stated, to ascertain the quantity of each of the three 
essential nutrients which the soil may yield to rice on plots not 
supplied with the respective nutrients but manured with the 
other essential ingredients of plant food. The supply of ferti¬ 
lizers was as follows (per tan = 0.0992 hectare) : 
1) 3 plots were left unmanured. 
2) 3 plots did not receive any nitrogenous manure, but were 
supplied with much phosphoric acid (10 kilogrms.) and potash 
(10 kilogrms.). 
3) 3 plots reveived a manure free from phosphatic ingredients 
but rich in nitrogen (10 kilogrms.) and potash (10 kilogrms.). 
4) 3 plots were not supplied with potash, but received much 
nitrogen (10 kilogrms.) and phosphoric acid (10 kilogrms.). 
