Table 2: Summary of fertilizer-phosphorus (P)-source fertilizer grade and mean pH and nutrient concentrations [± standard error (SE)] and water solubility.
|
Fertilizer-P sourcea |
Measured fertilizer gradeb |
pH |
Nutrient concentration (± SE) |
Fertilizer-P source water solubilityd |
||
|
N |
P |
Mg |
||||
|
|
|
|
__________________ % ____________________ |
|
||
|
ECSTReal |
3-35-0 |
7.2 (< 0.1) |
3.3 (0.1) |
15.5 (0.2) |
13.6 (0.3) |
2 - 3.8% |
|
ECSTSyn |
5-37-0 |
-c |
5.1 (0.2) |
16.1 (0.3) |
12.7 (0.3) |
2 - 3.8% |
|
MAP |
11-52-0 |
4.4 (0.02) |
10.7 (0.1) |
22.7 (0.2) |
1.5 (< 0.1) |
85 - 90% |
|
CPST |
6-27-0 |
8.8 (0.13) |
5.7 (0.2) |
11.7 (0.2) |
8.3 (0.2) |
4% |
a Electrochemically-precipitated synthetic struvite (ECSTSyn), wastewater derived electrochemically-precipitated struvite (ECSTReal), monoammonium phosphate (MAP), and chemically-precipitated struvite (CPST).
b Measured fertilizer grade expressed as % N - P2O5 - K2O.
c Limited ECSTSyn supply prohibited pH determination.
dFertilizer characteristic not determined through lab analysis.