Table 4. Average percentage difference between the aquaponics and hydroponic control treatments for every macronutrient (NO3-N, NH4-N, K, P, Ca, Mg, and S) added in the form of inorganic fertiliser.
| Percentage difference * | FM | BSF |
|---|---|---|
| Nitrate–NO3-N | - 29.21 | - 25.85 |
| Ammonia–NH4-N | - 49.33 | - 48.05 |
| Potassium–K | - 8.40 | - 10.67 |
| Phosphorus—P | - 2.55 | - 0.17 |
| Calcium—Ca | - 53.30 | - 53.75 |
| Magnesium—Mg | - 50.62 | - 52.58 |
| Sulphur—S | - 93.66 | - 91.77 |
| Total inorganic fertiliser | - 31.73 | - 31.68 |
FM: fish meal-based diet waste water. BSF: Black Soldier Fly meal-based diet waste water.
* a(IFn,j)—mean(IFn,control)) / mean(IFn,control)) * 100; where Dif_IFn is the percentage difference of the amount of inorganic fertiliser for the specific macronutrient n, IFn,j is the amount (g) of the inorganic fertiliser for the specific macronutrient n in the j treatment, and IFn,control is the amount (g) of the inorganic fertiliser for the specific macronutrient n in the control HP treatment.