Soil pH Amendment & Neutralization Calculator

Calculate agricultural limestone (calcite/dolomite) or elemental sulfur application rates required to achieve optimal soil pH based on soil texture, buffer capacity, and target depth.

Soil Test Metrics & Treatment Target

Current Soil pH Measured water pH (e.g. 5.2 for acid soil)

Target Soil pH Crop optimum (6.0–6.8 typical crops; 4.5–5.2 blueberries)

Soil Texture Class

Amendment Material

Treatment Area

Area Unit

Tillage Depth (Inches)

Common Agricultural Scenarios

Total Amendment Required Raise pH (Liming)

58.5 lbs

58.5 lbs / 1,000 sq ft (1.27 tons / acre)

Metric Equivalent

26.5 kg (2.86 t/ha)

Depth factor: 1.00× (standard 6")

Application Max Split Rule

Split into 2 Applications

Apply max 50 lbs/1,000 sq ft per season (allow 3–6 mo between splits)

Agronomic Application Guidelines

Buffer Reaction Timeline: 3 to 6 months for full reaction

Effective Neutralizing Value: Agricultural Limestone (100% CCE)

Target pH Shift (ΔpH): +1.30 pH units

Frequently Asked Questions

Why should lime applications be split into multiple treatments?

Applying more than 50 lbs of lime per 1,000 sq ft (or ~2 tons per acre) in a single surface topdress can cause temporary surface caustic shock, localized zinc/iron binding, and poor downward movement into the subsoil root zone.

How long does elemental sulfur take to lower soil pH?

Elemental sulfur (S) requires biological oxidation by Thiobacillus bacteria into sulfuric acid (H2SO4). This biological conversion requires warm soil (>55°F / 13°C) and adequate moisture, typically taking 3 to 12 months.

What is the difference between Calcitic and Dolomitic lime?

Calcitic limestone is primarily calcium carbonate (CaCO3). Dolomitic limestone contains both calcium carbonate and magnesium carbonate (MgCO3). Use dolomitic lime when your soil test shows magnesium deficiency (<50 ppm or <10% base saturation).