Micronutrient Dose Calculator

Work out micronutrient dose instantly with clear inputs, formula shown and shareable results.

About Micronutrient Dose Calculator

A foliar micronutrient dose is set as a percentage solution: a 0.5% zinc sulphate spray is 5 grams per litre, so 500 litres per hectare carries 2.5 kg. Soil application is quoted directly in kilograms per hectare — 25 kg/ha of zinc sulphate heptahydrate is the standard corrective dose for a zinc-deficient soil.

Formulas

Foliar dose

Product (kg/ha) = spray volume (L/ha) x concentration %; g/L = concentration % x 10

Soil dose

Soil corrective dose is applied at a fixed kg/ha rate, typically 25 kg/ha zinc sulphate

Worked example

With the default values below, Micronutrient Dose Calculator returns Micronutrient Product Required of 5.000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Application Methodone of Foliar spray, Soil application: Foliar spray
Spray Concentrationaccepts 0.01–10 %: 0.5 %
Spray Volume Per Hectareminimum 1 L/ha: 500 L/ha
Areaminimum 0.01 ha: 2 ha

Results

Micronutrient Product Required: 5.000
Dose Per Hectare: 2.500
Water Required: 1,000.0
Grams Per Litre Of Spray: 5.00

Step by step

1Values used
2Foliar dose
3Soil dose
4Micronutrient Product Required= 5.000
5Dose Per Hectare= 2.500
6Water Required= 1,000.0
7Grams Per Litre Of Spray= 5.00

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Micronutrients are toxic to plants and aquatic life above narrow thresholds. Follow the label rate exactly and never spray into or near watercourses.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Micronutrients are toxic to plants and aquatic life above narrow thresholds. Follow the label rate exactly and never spray into or near watercourses.

Frequently Asked Questions

Foliar or soil application?

Foliar corrects a visible deficiency within days and uses far less product, but the effect is short. Soil application builds reserves for the season and is preferred where the deficiency is chronic.

Can micronutrients be mixed with pesticides?

Often yes, but always run a jar compatibility test first. Zinc and iron sulphates are acidic and can destabilise alkaline-sensitive formulations, and lime-based sprays precipitate them out.