Soil Amendment / Lime Requirement Calculator
Convert a pure calcium-carbonate-equivalent recommendation into the amount of a lime material with a known effective neutralizing value.
Adjust a soil-test lime requirement for material quality
Convert a pure calcium-carbonate-equivalent recommendation into the amount of a lime material with a known effective neutralizing value.
How the soil amendment / lime requirement calculator works
The calculator starts with a soil-test lime recommendation expressed on a pure calcium carbonate equivalent basis. Dividing that recommendation by the material's effective CCE or neutralizing fraction increases the physical product rate when the material is less reactive than pure CaCO₃.
When to use this farm calculation
Use this after a soil laboratory or local agronomy recommendation has already established the lime requirement. It is useful for comparing agricultural lime sources with different effective neutralizing values.
Inputs, units and assumptions
This is deliberately not a pH-only lime recommendation engine. Buffer pH, soil texture, target pH, crop, depth and local laboratory method can all affect the base recommendation. Enter the effectiveness value supplied for the actual material, which may be called CCE, ECCE or neutralizing value depending on region.
Practical example
A 2,000 kg/ha pure-equivalent recommendation with a 90% effective material requires about 2,222 kg/ha of that material.