Estimate fertilizer product needed from area, target nutrient rate and the product’s nutrient percentage.
Result: Enter area, target rate and product percentage.
Formula used
Required nutrient = area × target rate. Fertilizer product = required nutrient ÷ nutrient fraction. For example, a 10% nutrient product contains 0.10 kg of that nutrient per kilogram of product.
Application note
Use the nutrient named on your soil test or product label. Do not assume the same target rate for nitrogen, phosphorus and potassium. Follow local guidance and the product label for safe application limits.