22 
MANURING EXPERIMENTS WITH PADDY RICE. 
Nitrogen. 
Phosphoric acid. 
Potash. 
10) Fukuoka. 
2 da farmyard manure 
0,1 
o ,3 
90 kin fish manure (hoshika).. 
0,4 
— 
Total 
°>5 
o ,3 
11) Fukuoka. 
4 da farmyard manure 
.. ..o ,4 
0,2 
0,6 
20 kuwamme rape cake .. 
.. ..1,0 
0,4 
°»3 
6.5 ka night-soil . 
.. ..0,8 
0,2 
0,4 
Total 
.. ..2,2 
0,8 
1-3 
The total average calculated from these data is found to be per tan : 
2.i kuwamme of nitrogen and 
i.o ,, ,, phosphoric acid. 
According to our experiments are required : 
2.0 kuwamme of nitrogen and 
3.5 ,, ,, phosphoric acid. 
The amount of nitrogen applied in practice appears to coin¬ 
cide very nearly with that found by the experiments to be 
required in our farm. As the soil on which the researches were 
made, contains, however, considerable quantities of available 
nitrogen, it will be advisable to apply to less rich soils, more 
than 2 kuwamme, even in those cases in which very easily 
soluble manures, such as night soil and fish manure are used. 
If straw, green plants, rape cake, bran, etc. are the principal 
fertilizers, still more, viz. up to 3 kuwamme, should be applied.— 
As to phosphoric acid , the above calculations show that Japan¬ 
ese farmers use far too small a quantity of this nutrient, a fact 
which I have already frequently pointed out. 9 The scarcity of 
phosphoric acid in most of the Japanese fertilizers and soils, and 
the continued cropping must have reduced in the course of 
centuries the stock of this ingredient to such an extent that in 
the majority of soils, both paddy and dry land, it exists at pre¬ 
sent in the relative minimum among the essential vegetable 
nutrients. It is consequently a most laudable enterprise to 
manufacture effective phosphatic fertilizers in the country itself, 
and to teach the farmer how to apply these auxiliary manures, 
9 See Bulletin No 3, p. 23—25, and Bulletin No 4, p. 36. 
