Start / Soil and fertilization / Liming and fertilization
Enter what the crop needs of N, P₂O₅, and K₂O and the blends you can buy. The calculator indicates which one meets the need 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.
Cost per hectare of the blends that meet all needs; the highlighted bar is the best option. Without prices, the ranking uses the amount of blend.
How much the best blend supplies of each nutrient, compared with what the crop needs, in kg/ha.
Blends that do not supply a requested nutrient are marked as 'does not meet'.
Drag the controls to simulate data different from what you entered (from 30% less to 30% more) and watch the result change instantly.
Kilos per hectare of each standard blend to meet nitrogen needs, in three N requirement scenarios, with P₂O₅ and K₂O as you entered them.
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 how much N, P₂O₅, and K₂O the crop needs in kg/ha, which comes from your soil analysis recommendation. Then check the contents and prices of the blends you can buy. The calculator shows which blend meets the three needs at the lowest cost, how much of each nutrient is left over, and the cost per kilo of nutrient.
Need of 60 kg/ha of N, 80 kg/ha of P₂O₅, and 60 kg/ha of K₂O, with 10 ha. Example prices: 04-14-08 at R$ 3,000/t and 08-28-16 at R$ 3,600/t.
For 04-14-08, the dose is set by N: 60 ÷ 0.04 = 1,500 kg/ha, costing R$ 4,500/ha. For 08-28-16, the dose is 60 ÷ 0.08 = 750 kg/ha, costing R$ 2,700/ha, or R$ 27,000 on the area. 20-00-20 is not suitable because it has no P.
08-28-16 supplies 210 kg/ha of P₂O₅ and 120 kg/ha of K₂O, leaving 130 kg of P₂O₅ and 60 kg of K₂O as a surplus. The cost per kg of N in this formulation is R$ 45.
For the amount of blend and what each nutrient supplies, see the NPK fertilization. To correct the soil before fertilizing, use the liming and fertilization.
Because the blend must supply at least the need for each nutrient. The nutrient that requires the largest amount of product sets the dose, and the other nutrients are left over in excess.
Yes, as long as the prices are of the same type (cash, same market, no freight). Add freight afterwards, per tonne, to compare the cost on the farm.
Because each one supplies only one or two nutrients, and the crop needs all three. To use single-nutrient sources, see the NPK source blend, which combines urea, MAP and KCl.
No. It compares blends for a need you enter. 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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