Acidity/Alkalinity of Fertilizer Materials

Acidity/Alkalinity of Fertilizer Materials

In terms of CaCO3 (pure lime) per 100# of material
MATERIAL ACIDITY
Phosphate Rock +50
Sodium Nitrate +29
Dried Blood -22
Animal Tankage +10
Cottonseed Meal -9
Fish Scraps -8
Ammonium Nitrate -60
MAP or DAP -20, -32
Ammonium Sulfate -110
Urea -84

For example, 9 lbs of pure lime would be required to neutralize the acidity created by 100-lbs of cotton seed meal. Positive values indicate the ability to neutralize acidity.

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