From David Beaulieu,
Your Guide to Landscaping.
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Definition: Lime is a rock powder used to raise the pH of soils high in acidity. An application of lime "sweetens" a soil -- i.e., makes the soil more alkaline. The capacity of lime to "sweeten" also makes it useful for battling outdoor pet odors.

Common Misspellings: lyme

Examples: They applied lime to their garden before rototilling, because a soil test showed their soil pH to be too low.