The following script will convert the needed amount of a fertilizer to obtain a certain concentration of an element, and vice versa. For detailed instructions, read below. A detailed table is also available below. A printer-friendly version of the table is also available. To view the script, you must have a java-capable browser.
First, put the needed concentration into the Input Value Here field. Do not include unit identifiers, they will remain constant (example, if the required concentration is in ppm, the answer shall also be in ppm).
Second, Select the Element that you want to use in your conversion in the Selection A pull-down menu. (Example, if you want to know the concentration of nitrogen if you have a 100 ppm solution of Ammonia, you would choose "Nitrogen" in the Selection A pull-down menu.)
Next, Select the Compound you want to use to obtain the Element from the options in the Selection B pull-down menu. Note: these options will change every time you change the element in the Selection A pull-down menu.
Next, Choose the type of conversion you want to perform.
If you desire to know the amount of fertilizer required to give you a certain concentration of an element, (ie, the number in the Input Value Here field is the desired element concentration) select the A to B option.
If you have a certain concentration of fertilizer and you what to know the concentration of an element in the solution (ie, the number in the Input Value Here field is fertilizer compound concentration), select the B to A option.
Finally click the Calculate button. The new value (either the needed concentration of fertilizer if you selected the A to B option or the element concentration if you selected the B to A option) will appear in the New Value field.
Conversion Factors for Fertilizer Salts |
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Conversation Factor |
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Column A |
Column B |
A to B |
B to A |
Nitrogen (N) |
Ammonia (NH3) | 1.216 | 0.822 |
| Nitrate (NO3) | 4.429 | 0.226 | |
| Potassium nitrate (KNO3) | 7.221 | 0.1385 | |
| Calcium nitrate (Ca(NO3)2) | 5.861 | 0.171 | |
| Ammonium sulfate ((NH4)2SO4) | 4.721 | 0.212 | |
| Ammonium nitrate (NH4NO3) | 2.857 | 0.350 | |
| Diammonium anhydride ((NH4)2HPO4 | 4.717 | 0.212 | |
Phosphorus (P) |
Phosphoric anhydride (P2O5) | 2.292 | 0.436 |
| Phosphate (PO4) | 3.066 | 0.326 | |
| Monopotassium phosphate (KH2PO4)) | 4.394 | 0.228 | |
| Diammoniums phosphate ((NH4)2 HPO4) | 2.586 | 0.235 | |
| Phosphoric acid (H3PO4) | 3.164 | 0.316 | |
Potassium (K) |
Potash (K20) | 1.205 | 0.830 |
| Potassium nitrate (KNO3) | 2.586 | 0.387 | |
| Monopotassium phosphate (KH2PO4) | 3.481 | 0.287 | |
| Potassium chloride (KCl) | 1.907 | 0.524 | |
| Potassium sulfate (K2SO4) | 2.229 | 0.449 | |
Calcium (Ca) |
Calcium oxide (CaO) | 1.399 | 0.715 |
| Calcium nitrate (Ca(NO3)2) | 4.094 | 0.244 | |
| Calciumchloride (CaCl2 * 6H20) | 5.467 | 0.183 | |
| Calcium sulfate (CaSO4 * 2H2O) | 4.296 | 0.233 | |
Magnesium (Mg) |
Magnesium oxide (MgO) | 1.658 | 0.603 |
| Magnesium sulfate (MgSO4 * 7H2O) | 10.14 | 0.0986 | |
Sulfur (S) |
Sulfuric acid (H2SO4) | 3.059 | 0.327 |
| Ammonium sulfate ((NH4)2SO4) | 4.124 | 0.2435 | |
| Potassium sulfate (K2SO4) | 5.437 | 0.184 | |
| Magnesium sulfate (MgSO4 * 2H2O) | 7.689 | 0.130 | |
| Calcium sulfate (CaSO4 * 2H2O) | 5.371 | 0.186 | |
Iron (Fe) |
Ferrous sulfate (FeSO4 * 7H2O) | 4.978 | 0.201 |
| Iron chelate (FeEDTA) | 10.00 | 0.100 | |
Boron (B) |
Boric acid (H3BO3) | 5.717 | 0.175 |
| Sodium tetraborate (Na2B4O7 * 10H2O) borax | 8.820 | 0.113 | |
Copper (Cu) |
Copper sulfate (CuSO4 * 5H20) | 3.930 | 0.254 |
Manganese (Mn) |
Manganese sulfate (MnSO4 * 4H2O) | 4.061 | 0.246 |
| Manganese chloride (MnCl2 * 4H2O) | 3.602 | 0.278 | |
| Manganese chelate (MnEDTA) 5% liquid | 20.00 | 0.050 | |
Zinc (Zn) |
Zinc sulfate (ZnSO4 * 7H2O) | 4.400 | 0.227 |
| Zinc chloride (ZnCl2) | 2.085 | 0.480 | |
| Zinc chelate (ZnEDTA) 14% powder | 7.143 | 0.140 | |
| Zinc chelate, 9% liquid | 11.11 | 0.090 | |
Molybdenum (Mo) |
Ammonium molybdate ((NH4)6Mo7O24) | 1.733 | 0.577 |
| Sodium molybdate (Na6Mo7O24) | 1.777 | 0.563 | |
Note: These factors are derived from the fraction of an element present in a compound based upon atomic weight of the element and molecular weight of the compound