I 
390 
r 
Average composition of Fertilizers. 
The following table gives the average percentage composition of 
the various artificial fertilizers in common use. From thu t table it wt 
be easy to see what quantity of any particular fertilizer can replace 
any other in order to supply equivalent quantities of the same const - 
tuent. 
Ammonium Sulphate 
Potassium Nitrate 
Sodium Nitrate 
Ordinary Super- 
phosphate 
Double or concentrat- 
ed Superphosphate 
Basic Slag 
Mineral Phosphate 
Bone meal 
Bone dust 
Potassium Chloride 
Potassium Sulphate 
Kainit 
Perlis Guano (Phos- 
phatic) 
Ground Nut Cake 
Rape Cake 
Para Seed Cake 
Castor Seed Cake 
Calcium Nitrate 
Calcium Cyanamide 
Nitrogen 
N. per cent. 
20 % 
13 % 
15 - 5 % 
Potash O. 
per cent. 
46 % 
Phosphoric acid, 
p O per cent. 
20 % 
44 % 
17 % 
36 . 5 % 
21% 
20% 
Lime Ca O 
per cent. 
35 % 
8 % 
6 % 
5 % 
6 % 
13 % 
20% 
60% 
52 % 
12.4% 
1.2% 
1.2% 
1 . 2 % 
1 . 2 % 
15 - 5 % 
1.2% 
2.3% 
1.2% 
1.2% 
REMARKS ON THE PURCHASE AND USE OF FER- 
TILIZERS : — No fertilizers should be purchased without a guaiantee 
from the vendor of the percentage of the essential constituent 111 eac 
case. In most countries the buyer is protected by a Fertilizers Act. 
The purchase of mixed manures is not recommended as these are 
much more expensive, since the buyer has to pay for the cost of 
mixing and the experience of the vendor. 
The following manures should not be mixed together, otherwise 
loss results due to volatilization or to chemical action between the 
constituents : — 
1. Lime and Ammonium Sulphate. 
2. Basic Slag and Ammonium Sulphate 
3. Lime and Superphosphate , T . 
4. Superphosphate with Sodium, Potassium or Calcium Nitrate 
5. Lime and Nitrogenous Guanos 
C Basic Slag and Nitrogenous Guanos 
B. J. EATON, F.I.C., F.C.S., 
Agricultural Chemist, F.M.S. 
