Effective Neutralising Value
The effective neutralising value of a lime is the ability for a unit mass of lime to change soil pH. It takes into account the chemical composition (NV), the particle size distribution (% by weight) and the solubility of a lime.
As particle size increases, the amount that portion of lime can neutralise decreases. Lime particles over 0.5mm are only 50% as effective as smaller lime particles in increasing pH. Lime particles over 1mm are almost non effective.
The ENV is the ultimate measure of lime quality. Try our Online Lime Calculator to see how the NV and particle size distribution of a lime determines the ENV, and how the ENV encapsulates a lime's capacity to increase the pH of your soil.