Soil pH, texture and organic matter are used to flag management considerations—not to invent fertilizer rates. High or low P/K status should be based on a locally calibrated soil test.

Important: There is no single fertilizer rate that applies to every country, soil and yield target. Enter the locally calibrated N, P₂O₅, K₂O, S and/or CaO recommendation (per hectare or per acre). The calculator converts those nutrient targets into the quantity of the automatically recommended product. Leave unknown nutrient targets blank—do not enter guessed values. CaO is expressed as calcium oxide, not elemental Ca.