Start / Soil and fertilization / Liming and fertilization
Choose the blend and enter the N, P₂O₅, and K₂O doses to find out how many kilograms per hectare to apply and what each nutrient delivers.
Pre-sizing and estimating tool: the results do not replace a design, calculation, or report signed by a qualified professional, nor verification against the applicable standards.
Comparison, in kg/ha, between what the recommendation calls for and what the chosen blend supplies.
Kilos of blend per hectare for your doses. Blends without a column do not contain one of the requested nutrients.
Drag the controls to simulate data different from what you entered (from 30% less to 30% more) and watch the result change instantly.
Blend (kg/ha) needed to deliver the dose of each nutrient with the contents of each standard blend. No source means the blend does not contain that nutrient.
The calculation done in steps, with the values you entered.
The calculation memo gathers this page's inputs, results, equations, assumptions, and references, with fields for project, responsible person, and review. The full report also includes the charts and interpretations, in color. In the print window, choose Save as PDF.
Choose the bag's blend (for example, 04-14-08) or enter the contents by hand. Then type in the N, P₂O₅, and K₂O doses recommended for the crop, which come from the soil analysis and your region's recommendation table. The calculator shows how many kilograms of blend to apply per hectare, what each nutrient delivers, and what is left over or missing.
Recommendation of 20 kg/ha of N, 80 kg/ha of P₂O₅ and 40 kg/ha of K₂O, with the 04-14-08 blend.
Amount per nutrient: N = 20 ÷ 0.04 = 500 kg/ha; P₂O₅ = 80 ÷ 0.14 = 571 kg/ha; K₂O = 40 ÷ 0.08 = 500 kg/ha. The highest value sets the dose: 571 kg/ha, limited by phosphorus.
At this amount, the blend supplies 22.9 kg/ha of N, 80 kg/ha of P₂O₅ and 45.7 kg/ha of K₂O: about 3 kg of N and 6 kg of K₂O are left over.
To make up what the blend does not supply, use single-nutrient sources. The contents below are typical ranges; confirm on the package or the batch invoice.
| Source | Main nutrient | Typical content |
|---|---|---|
| Urea | N | 45% |
| Ammonium sulfate | N and sulfur | 20% a 21% de N; 22% a 24% de S |
| MAP | P₂O₅ e N | 48% a 52% de P₂O₅; 9% a 11% de N |
| Single superphosphate | P₂O₅, calcium and sulfur | 18% a 20% de P₂O₅ |
| Triple superphosphate | P₂O₅ | 41% a 46% |
| Potassium chloride | K₂O | 58% a 60% |
Before fertilizing, correct the acidity with the liming. To add the fertilizer to the crop budget, use the production cost per hectare.
Divide the recommended dose of each nutrient by its content in the blend. The largest result sets the amount to apply, because that is the nutrient that limits the dose.
It stays in the soil beyond the recommendation. To avoid excess, choose another formulation or supply the missing nutrient with a simple source.
These are the N, P₂O₅ and K₂O contents in percent. In 100 kg of product there are 4 kg of nitrogen, 14 kg of phosphorus (P₂O₅) and 8 kg of potassium (K₂O). The rest is filler and other nutrients.
It is the way to express the guaranteed content of fertilizers in Brazil. The fertilization recommendation uses the same basis, so the numbers compare directly, without conversion.
Use a simple source: urea or ammonium sulfate for N, superphosphate for P₂O₅, and potassium chloride for K₂O. Divide the missing rate by the source’s content to get the amount.
The one whose ratio is closest to the recommended doses. The closer it is, the less excess nutrient you pay for without needing it.
Depends on the crop and the soil. In many cases N is split, with part applied as top-dressing, to reduce losses. Follow the crop's technical recommendation.
Important notice: the Agrocalcs tools make estimates and preliminary sizing based on the data entered and on published engineering methods. They do not replace a design, a calculation report or a report signed by a qualified professional (CREA/ART), nor verification against the applicable technical standards and legislation, such as the Regulatory Standards of the Ministry of Labor. Material and fuel properties vary: check with the manufacturer or with analyses of your process before deciding. By using the site, you agree to the Terms of Use.
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