Soil pH Lime Requirement
Estimate how much agricultural lime is needed to raise soil pH to a target for a garden or field, free online.
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A common rule of thumb for raising pH by one unit in the top 6 inches (15 cm): about 1 ton of ground limestone per acre for sandy soil, 2 for loam and 3 for clay (more with lots of organic matter). Soil-test advice from a lab is always more accurate.