There are several types of fertilizer available on the market, in both liquid and dry granular form.
| Rock phosphate |
0-(3 to 8)-0 |
Raw mined product with limited phosphate availability |
| Superphosphate (OSP or SSP) |
0-20-0-10S |
Results from reaction of rock P with sulfuric acid - an older form of phosphate |
| Triple Super Phosphate (monocalcium phosphate) |
0-45-0 |
Solid granular fertilizer with good handling properties |
| Monoammonium phosphate (MAP) |
11-48-0
11-51-0
11-52-0
11-54-0
11-55-0 |
A solid granular that does not absorb moisture during storage. It is fairly resistant to breakdown during handling |
| Diammonium phosphate (DAP) |
18-46-0 |
Solid granular fertilizer with higher level of nitrogen |
| Ammonium Polyphosphate |
10-34-0 |
The solution will settle out below -18 °C, and must be brought back into solution |
Many dry blends of urea and ammonium phosphate are also available, with analysis such as 28-28-0, 17-34-0, etc.
The choice of liquid or dry formulation should be based on the fit for individual farming operations. The effects of environmental conditions, soil properties, and method of application are the same for liquid and dry formulations. The fertilizer choice should be based on cost, availability, and fertilizer placement options.
Similarly, soil pH should not influence the choice in phosphate fertilizer formulations. Agronomic studies have not found differences between MAP and DAP, so formulation selection should be based on other factors.