Effluent & Sludge Nutrient Calculator

The Effluent & Sludge Nutrient Calculator works out the appropriate effluent and sludge application rate in mm and ML/ha.

Effluent and sludge samples should first be lab analysed before use with the calculator. Farmers who have not sampled in recent years can adopt typical nutrient concentrations, which vary from farm to farm because of differences in systems, management and climate. 

The calculator will also estimate how much N, P & K should be applied at the target application rate, and if you enter comparative local prices for a number of fertiliser products, it will also calculate the nutrient value of each ML of effluent or sludge spread.