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