From field plots to pot trials — convert your nutrient recommendation into exact fertilizer amounts using simple formulas
Research utility · v1.0
Fertilizer calculator
Turn nutrient recommendations into exact, trial-ready amounts for plots, pots, and incubation jars.
Convert your nutrient recommendation into exact fertilizer amounts for field plots, pot trials, or incubation studies. Enter your target, choose your fertilizer source, and get a precise weight to apply.
How Are Fertilizer Application Rates Calculated?
Fertilizer application rate is calculated by dividing the required amount of pure nutrient by the percentage of that nutrient in the chosen fertilizer product.
How Do You Convert a Fertilizer Rate from kg/ha to a Total Amount for a Field Plot?
Since a hectare is 10,000 square meters, the plot’s fertilizer amount is the per-hectare rate scaled down by the plot’s fraction of a hectare.
How Do You Convert a Fertilizer Rate from kg/ha to Grams per Pot?
Soil scientists use a standard reference: one hectare of soil to the normal plow depth of 15 cm is assumed to weigh approximately 2,000,000 kg, based on a typical bulk density of 1.33 g/cm³.
What Is the “Furrow Slice” Method in Soil Science, and How Is the 2,000,000 kg Figure Calculated?
The furrow slice method assumes a fixed reference soil mass per hectare, calculated from area, depth, and bulk density.
How Do You Calculate Fertilizer for an Incubation Study?
Incubation studies use the same furrow slice conversion as pot experiments, but soil weight is typically measured in grams.
What Happens When a Fertilizer Supplies More Than One Nutrient?
Many fertilizers, like DAP, Ammonium Sulphate, and Gypsum, supply more than one nutrient at once. The second nutrient’s product amount must be reduced by whatever the first product already incidentally supplies.
What Percentage of Nitrogen, Phosphorus, or Potassium Is in Common Fertilizers?
Common fertilizer nutrient contents include:
| Fertilizer | N (%) | P₂O₅ (%) | K₂O (%) | S (%) | Ca (%) |
|---|---|---|---|---|---|
| Urea | 46 | — | — | — | — |
| Ammonium Sulphate | 21 | — | — | 24 | — |
| DAP (Diammonium Phosphate) | 18 | 46 | — | — | — |
| SSP (Single Super Phosphate) | — | 16 | — | 12 | 19 |
| MOP (Muriate of Potash) | — | — | 60 | — | — |
| SOP (Sulphate of Potash) | — | — | 50 | 18 | — |
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