MANURING EXPERIMENTS WITH PADDY RICE (SECOND YEAR). 
41 
is no longer materially affected. Thus the proportion of nitrogen 
consumed by a certain crop from a given supply in the manure 
cannot be regarded as an exact basis for the determination of 
the general effect of that manure on the special crop in view. 
Nevertheless it may give valuable information as to the exact 
time at which the nitrogen became available, if its relation to 
the yield of grain and straw, and the proportion between grain 
and straw, are considered together and at the same time. If 
we carry out such calculations in the present case we get 
the following results : 
Hulled grain, 
per cent of the 
whole crop. 
Nitrogen in 
the dry matter 
of the whole crop 
0/ 
Without nitrogen... 
. 34 -i 
/o 
0.90 
Steamed bone dust 
. 33 -o 
0.91 
Hoshika . 
. 34 - 1 
0.91 
Shimekasu . 
. 34 -i 
0.96 
Blood meal . 
. 35-3 
00 
Ö 
Crude bone dust ... 
. 33-7 
O.92 
Shöchü cake. 
. 32-3 
0.88 
Horn meal . 
. 35-2 
0.94 
Peruvian guano ... 
. 32-5 
0.91 
Shöyu cake . 
. 34-3 
o -93 
Rape cake . 
. 33 - 1 
0.92 
Night-soil . 
. 32-5 
0.90 
Ammonium sulphate 
. 35 -i 
o -95 
Farmyard manure 
. 34 -i 
0.90 
Rice bran 
. 35-5 
0.92 
Green plants. 
. 344 
0.90 
The variations caused by the different fertilizers as regards the 
percentage of hulled grain in the whole crop as the percentage 
content of nitrogen, are so insignificant that in all the special 
trials the nitrogen of the manures appears to have displayed its 
full effect. 
