VARIOUS PHOSPHATIC MA. MURKS ON UPI.ANI) SOIL. 
IS 
The proportion of phosphoric acid consumed per plot by the 
wheat, as found by the analysis of the crop, are recorded in the 
following table : 
Phospho¬ 
ric acid 
originally 
applied. 
grms. 
Kind of phosphate. 
In the 
crop. 
grms. 
Consumed from the 
manure by the 
3rd crop. 
per cent 
of the 
1 grms. iphosphoric 
acid 
1 applied. 
Consumed 
by the 
first three 
crops, per 
cent of the 
phosphoric 
acid 
applied. 
O 
No phosphoric manure ... 
0.102 
— 
—. 
1413 
Double superphosphate... 
O.204 
0.102 
7.2 
39-5 
2.826 
99 )» 
0.311 
0.209 
7-4 
— 
1.696 
Steamed hone dust* 
(0.172) 
— 
( 7 - 6 ) 
( 31 - 5 ) 
3-392 
99 99 »> 
°-357 
0.255 
7.6 
— 
2.120 
Precipitated calcium phos. 
0.286 
0.184 
8.7 
30.8 
4.240 
>» 99 99 
o -437 
0.335 
7-9 
— 
1.696 
Crude bone dust . 
0.482 
0.3S0 
22.4 
45-5 
3-392 
»♦ 99 »> . 
0.774 
0.672 
19.8 
— 
1.696 
Raw crushed bones. 
0.551 
0.449 
26.5 
489 
3 392 
99 99 99 . 
0-794 
0.692 
20.4 
— 
2.120 
Thomas phosphate. 
0.210 
0.108 
5 -i 
21-3 
4.240 
>> >» . 
0.275 
0.173 
4.1 
— 
2.826 
Bone ash . 
0.332 
0.230 
82 
16.2 
5-652 
99 99 . 
0.453 
0-351 
6 2 
— 
The relative assimilability and manorial value of the various 
phosphates is, according to the preceding results obtained with 3 
consecutive crops, as follows : 
Relative 
assimilability. 
Relative 
increase, dry 
matter of the 3 crops. 
Relative 
mamirial 
value. 
Double superphosphate 
.. IOO 
IOO 
IOO 
Steamed bone dust . 
- 79-8 
84.4 
82 
Precipitated calcium phosphate 
00 
b 
72.0 
75 
Crude bone dust.. 
.. 115.2 
99.9 
108 
Raw crushed bones . 
.. 124.0 
IOI.I 
113 
Thomas phosphate . 
.. 54.0 
42.5 
48 
Bone ash . 
41.0 
34-6 
3S 
* See the note on p. 14. 
