24 
MANURING EXPERIMENTS WITH PADDY RICE (SECOND YEAR). 
Phospho¬ 
ric acid 
in the 
manure, 
grms. 
Phophos- 
ric acid 
in the 
whole 
crop, 
grms. 
Phosphoric acid 
consumed from the 
manure. 
grms. 
per cent 
of the 
phospho¬ 
ric acid 
applied. 
Without phosphoric acid 
0 
0.915 
— 
— 
Sodium phosphate . 
3-67 
1.316 
0.401 
10-9 
,1 n ...... 
7-34 
1.936 
1.021 
13-9 
Double superphosphate 
3-89 
1.854 
0-939 
24.1 
J) U . . • . 
7.78 
2.290 
i -375 
17.7 
Precipitated phosphate 
4-59 
2.067 
I .152 
25.1 
î j n .... 
9.18 
2.565 
b\ 
Ln 
O 
18.0 
Peruvian guano. 
6.97 
1-496 
0.581 
8-3 
n n •• •• • • •• 
13-94 
1.787 
0.872 
6-3 
Thomas phosphate . 
6.885 
1.85g 
0.944 
13-7 
i J J1 • • * • • • 
13-77 
2-332 
I - 4 I 7 
10.3 
Steamed bone dust . 
6.885 
i.88g 
0.974 
I 4- I 5 
n î j it ...... 
13-77 
3.024 
2.109 
15-3 
Crude bone dust . 
6.885 
1.918 
1.003 
14.6 
1 J 51 55 . 
13-77 
3-339 
2.124 
15.4 
Bone ash . 
6.885 
I - 37 I 
0.456 
6.6 
^ 3-77 
1-939 
1.024 
7-4 
Phosphorite. 
6.885 
1-033 
0.118 
i-7 
>5 •• •• •• •• •• 
13-77 
o -997 
0.082 
0.6 
The figures given for the absolute quantities consumed per 
plot indicate that, with the exception of the phosphorite, from 
the larger doses of phosphatic manure considerably more was 
taken up than from the smaller ones, so that here also the 
results obtained with the smaller doses are sure to yield reliable 
information on the assimilability of various forms of phospho¬ 
ric acid. -Assuming the assimilability of the phosphoric acid 
of the superphosphate (24.1%) to be 100, and calculating, on 
this basis, the relative assimilability of the other forms of phos¬ 
phoric acid we obtain the following results to which we add 
