MANURING EXPERIMENTS WITH PADDY RICE (THIRD YEAR). 
9 
The results of the two last years have now enabled us to find 
oht how much assimilable potash must be contained in the soil 
for the production of i koku of hulled rice. 5 The total quantity 
of potash in the harvested materials was per frame 4.32 resp. 
3.14 grms., hence per tan 5.19 resp. 3.77 kilogrms. which 
correspond to 10.38 resp. 7.54 kilogrms. of total assimilable 
potash in the soil. The yield of hulled grain amounted to 3.97 
resp. 2.82 koku, hence the proportion of assimilable potash 
required for the production of 1 koku was in 1890 2.62 and in 
1891 2.67 kilogrms. 5 
In connection with the preceding researches we also as¬ 
certained the influence of the various manures on the composi¬ 
tion of the straw and hulled grain. The analysis of the crop of 
1890 made in conjunction with S. Uchiyama and T. Yamada , 
graduates of the College, gave the following results : 
5 The quantities of nitrogen and phosphoric acid necessary for the produc¬ 
tion of i koku hulled grain have already been given in bulletin No. 10, p. 42. 
