Accurate fertigation doses for rehabilitating disturbed construction soils. Reduce waste, protect plants, and document application. Get correct injector ratios and tank mix amounts fast.
| Water (m³) | Target (ppm) | Nutrient basis | Grade | Injector | Tank (L) | Fertilizer (kg) | Conc (g/L) |
|---|---|---|---|---|---|---|---|
| 10.000 | 120 | N | 20-20-20 | 1:100 | 200 | 0.060 | 6.00 |
| 25.000 | 80 | K2O | 10-0-20 | 1:150 | 300 | 0.111 | 6.67 |
| 5.000 | 150 | P2O5 | 0-52-34 | 1:50 | 100 | 0.028 | 2.80 |
Example outputs assume 100% purity and zero safety factor.
Construction projects often finish with temporary landscaping, hydroseeding, or plant establishment around hardscapes and disturbed soils. Fertigation delivers nutrients through irrigation water, reducing handling, improving uniformity, and supporting rapid coverage that helps limit erosion and sediment transport. It also minimizes dust and nutrient losses because dosing happens while the surface is already being wetted.
Start with the project specification or agronomic recommendation and convert it into a target concentration. The calculator treats ppm as mg/L of the selected nutrient basis. Multiply the target ppm by total water volume to obtain nutrient mass required, then adjust for product grade and purity. When only an N‑P‑K grade is available, select the nutrient basis that matches the target and enter the corresponding percentage.
Injection equipment links water flow to stock solution flow. The water:stock ratio defines how many liters of irrigation water are treated by one liter of stock. The calculator estimates total stock used and the required concentration in g/L, then converts that concentration into a per‑tank fertilizer mass for field mixing.
Before mixing, confirm fertilizer solubility at expected water temperature and check compatibility when combining products. Calibrate injectors with a measured draw test, then compare planned and observed stock consumption. Use the safety factor for minor line losses, but avoid masking poor calibration or clogged filters. If concentration is high, split dosing across multiple passes or increase the injection ratio to stay within equipment limits.
Daily records reduce claims and rework. Export the CSV to attach to quality logs, then share the PDF with foremen and applicators. Add cost per kilogram to forecast material spend across areas and irrigation cycles. Review results when water volumes or ppm targets change during commissioning. Pair dosing records with EC readings to confirm the system is delivering nutrients without over‑salinizing sensitive plantings.
Use the ppm specified in the landscaping or revegetation submittal. If only a product rate is given, convert it to an equivalent ppm using planned water volume, then verify with your agronomist or supplier.
Match the basis to the requirement you are controlling: nitrogen for growth, P2O5 for phosphorus programs, or K2O for potassium programs. Then enter the corresponding percentage from the fertilizer grade.
Some products contain fillers or blended nutrients. Purity adjusts the active fraction so the calculated fertilizer mass delivers the intended nutrient dose, reducing under‑feeding or costly over‑application.
Recalculate using the observed ratio from a draw test. The total fertilizer mass for the job stays similar, but the stock concentration and per‑tank mix change to match the new injection setting.
Stay within supplier solubility limits, mix with clean water, and add products in the recommended order. If concentration is high, dilute the stock, increase the ratio, or split dosing into multiple passes.
Keep water volume, target ppm, fertilizer mass, injector ratio, and tank mix quantities. Export the CSV for logs and the PDF for field crews, and pair them with calibration notes and EC checks.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.