MANURING EXPERIMENTS WITH PADDY RICE (THIRD YEAR). 
21 
• 
Phosphoric acid 
Phosphoric acid, 
consumed from 
Phosphoric acid, 
consumed from the 
consumed 
Kind of 
the residue.« 
original manure. 
applied 
in 1890. 
grms. 
in the first 
season 
(1890). 
% 
left in 
the soil. 
grms. 
phosphate. 
grms. 
% 
Second 
season. 
% 
First & 
second 
seasons. 
0/ 
Jo 
Average 
% 
3-89 
24.1 
2.95 
Double Superph. 
p 
<~n 
00 
5-3 
4.1 
28.2 
1 26.5 
7.78 
17.7 
6.40 
»» 11 
0.556 
8.7 
7 -i 
24.8 
) 
4-59 
25.1 
3-44 
Precipitated Phos. 
0.341 
9.9 
7-4 
32-5 
1 28.8 
9.18 
18.0 
7-53 
>» 11 
0.646 
8.6 
7.0 
25.0 
] 
6.97 
8-3 
6-39 
Peruvian Guano. 
0.451 
7 - 1 
6.5 
14.8 
\ 13-9 
13-94 
6.3 
i 3-°7 
11 11 
0-935 
7 -i 
6.7 
13.0 
i 
6.885 
13-7 
5 94 
Thomas Phosph. 
0.454 
7.6 
6.6 
20.3 
O'! 
CO 
1 3-77 
10.3 
12.35 
»» »» 
O.ggO 
8.0 
7-2 
* 7-5 
) 
6.885 
14.2 
5 - 9 1 
Steamed Bone D. 
0.392 
6.6 
5-7 
19.9 
120.9 
13-77 
15-3 
11.66 
11 >» »» 
0.916 
7-9 
6.6 
21. g 
6.885 
14.6 
Ln 
bo 
CO 
Crude Bone Dust. 
0.414 
7.0 
6.0 
20.6 
121.3 
1 3-77 
* 5-4 
11.65 
»» 11 >j 
O.9OO 
7-7 
6.5 
21.9 
6.885 
6.6 
6-43 
Bone Ash. 
O 
VO 
00 
3 -i 
2-9 
9-5 
t 9-8 
13-77 
7-4 
12-75 
11 11 
°-357 
2.8 
2.6 
10.0 
) 
6.885 
i -7 
6.77 
Phosphorite. 
0-155 
2-3 
2.2 
3-9 
I 3-6 
I 3-77 
0.6 
13.69 
11 
°- 37 2 
2.7 
2.7 
3-3 
i 
The two preceding tables afford a sufficiently reliable basis 
for a judgment on the relative manurial action of the various 
phosphates displayed in the first two seasons. Assuming the 
assimilability of the phosphoric acid of the superphosphate 
(28.2%) to be 100, and calculating, on this basis, the relative 
assimilability of the other forms of phosphoric acid, we obtain 
the following figures : 
8. After deducting 1.022 grms. of phosphoric acid which had been con¬ 
sumed from the soil ingredients. 
