VARIOUS PHOSPHATIC MANURES ON UPLAND SOIL. 
17 
Double superphosphate ... . 
Steamed bone dust . 
Precipitated calcium phosphate 
Crude bone dust. 
Raw crushed bones .. 
Thomas phosphate . 
Rone ash . 
Relative increase. 
4 crops. 
. IOO 
. S3.8 
. 71-9 
. 102.4 
. 107.3 
. 42.6 
. 34-7 
The analysis of the backwheat showed that the following quan¬ 
tities of phosphoric acid had been consumed from the soil and 
manure : 
Phospho¬ 
ric acid 
in the 
Phospho¬ 
ric acid 
in the 
Phosphoric acid 
consumed from 
the manure 
Phospho¬ 
ric acid 
consumed 
by the ist. 
original 
manure. 
grins. 
whole 
crop. 
grins. 
1 grins. 
Per cent 
of the 
phosphoric 
acid 
applied. 
2nd, 3rd, 
and 4th 
crops. 
°s 
O 
No phosphatic manure ... 
0.025 
— 
— 
1413 
Double superphosphate... 
0.036 
0.01 l 
0.8 • 
40.3 
2.826 
9} 99 
0.037 
O 012 
0.4 
— 
1.696 
Steamed bone dust. 
O.O27 
0.002 
0.1 
31.6 
3-392 
99 99 99 . 
0.043 
0.018 
0.5 
— 
2.120 
Precipitated calcium phos. 
0.034 
O.OO9 
°-4 
3 ' 3 
4.240 
>» 99 9* 
O.072 
0.047 
I.I 
— 
1.696 
Crude bone dust . 
0.074 
O.049 
2.9 
4S.8 
3-392 
99 99 91 . 
0 1 30 
O.IO5 
3 - 1 
— 
1.696 
Raw crushed bones. 
0.132 
0.107 
63 
55 2 
3-392 
99 99 99 . 
O '93 
0.168 
5 -o 
— 
2.120 
Thomas phosphate. 
0 029 
1 O.OO4 
0.2 
21-5 
4.240 
99 99 . 
0.031 
O.OOÔ 
O I 
— 
2.826 
Bone ash. 
0054 
0.029 
1.0 
17.2 
5- 6 52 
99 99 . 
GO 
O 
d 
0073 
1.3 
— 
The relative assimilability and manurial value of the phosphoric 
acid of the fertilizers experimented on as found with the 4 con¬ 
secutive crops, is as follows : 
