Appendices - Soil Essentials: Managing Your Farm's Primary Asset - page 163

Appendix 18. The influence of chemical fertilisers on pH
Source: Queensland Department of Primary Industry.

Fertiliser Solubility in cold (15°C)

water (grams per litre)

Rate of pH change Influence on pH

Ammonium nitrate 1183 Rapid Acidic

Ammonium sulphate 706 Rapid Acidic

Calcium carbonate 0.015 Slow Alkaline

Calcium chloride 350 Rapid Alkaline

Calcium hydroxide 1.85 Medium Alkaline

Calcium nitrate 2660 Rapid Alkaline

Calcium sulphate (gypsum) 2.41 Medium Neutral

Dolomite 0.01 Slow Alkaline

Magnesium carbonate 0.11 Slow Alkaline

Magnesium sulphate (Epsom salts) 710 Rapid Neutral

Monoammonium phosphate 227 Rapid Acidic

Phospheric acid 5480 Rapid Acidic

Potassium chloride 238 Rapid Alkaline

Potassium nitrate 133 Rapid Neutral

Superphosphate - single - Slow Acidic

Superphosphate - triple - Medium Acidic

Urea 1000 Rapid Acidic