Start / Soil and fertilization / Liming and fertilization
Enter the crop's N, P₂O₅, and K₂O needs and the price of urea, MAP, and potassium chloride. The calculator shows the mix that meets the crop's needs at the lowest cost.
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.
Kilos per hectare of urea, MAP and KCl in the chosen mix; each bar shows the dose of one source.
Blend cost per hectare for each possible MAP dose; the highlighted point is the lowest-cost dose.
Dose, cost, and nutrients each source delivers.
Drag the controls to simulate data different from what you entered (from 30% less to 30% more) and watch the result change instantly.
Cost per hectare of the lowest-cost blend for different MAP and urea prices, with the needs and contents entered.
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.
Enter the crop's N, P₂O₅, and K₂O needs and the contents and prices of urea, MAP, and potassium chloride. The calculator chooses the dose of each source that meets the need at the lowest cost and shows what each one delivers.
Need of 60 kg/ha of N, 80 kg/ha of P₂O₅, and 60 kg/ha of K₂O, with 10 ha. Example prices: urea R$ 2,600/t, MAP R$ 4,200/t, and KCl R$ 2,300/t.
MAP (11-52-0): 80 ÷ 0.52 = 154 kg/ha, which already supplies 17 kg/ha of N. There is still a shortfall of 43 kg/ha of N, so urea (45%): 43 ÷ 0.45 = 96 kg/ha. KCl (60%): 60 ÷ 0.60 = 100 kg/ha.
Cost: 154 × 4.20 + 96 × 2.60 + 100 × 2.30 = R$ 1,125/ha, or R$ 11,250 on 10 ha. Swapping one kilo of urea for one extra kilo of MAP would cost R$ 4.20 and save 0.11 kg of N, which is worth about R$ 0.64 in urea. That is why the MAP dose stays at the minimum.
The example prices differ from those in the fertilizer blend calculator. Only compare the two using prices from the same location.
To compare with a ready-made blend, use the lowest-cost NPK formulation. For the amount and what each nutrient supplies, see the NPK fertilization.
Because MAP also supplies N, but that N usually costs more than urea N. Buying MAP beyond what P requires only pays off if the MAP price is low compared with urea.
Generally yes, but the mixture can cake or lose efficiency if the sources have different moisture or particle size. Confirm compatibility with the supplier and mix only at the time of application.
Because you pay for each source's nutrient separately, without the granulation cost and the surplus nutrients a blend may bring. Always compare with prices from the same location.
No. It shows the lowest-cost blend for the need entered. The dose comes from the soil analysis and the crop recommendation, made by the agronomist or the laboratory.
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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