What is the primary purpose of lime in soil management?

• A. To raise soil salinity
• B. To increase nitrogen content
• C. To reduce soil moisture
• D. To reduce soil acidity

Answer: (D)

Lime is used to neutralize soil acidity and raise soil pH, making nutrients more available to plants. In acidic soils, hydrogen ions and exchangeable aluminum can hinder root growth and tie up nutrients; lime supplies calcium (and magnesium in dolomitic forms) and reacts with those acids, reducing toxicity and turning the soil toward a more favorable pH. As pH moves into the optimal range, nutrients like phosphorus and others become easier for plants to take up, supporting healthier growth. It doesn’t raise salinity, add nitrogen, or directly affect soil moisture.