Limestone is used to neutralize acidic soils. When limestone is added to acidic soil, it reacts with the acids in the soil to form a neutral calcium salt, such as calcium carbonate. This process reduces the acidity of the soil and makes it more suitable for plant growth.

The amount of limestone needed to neutralize soil depends on the acidity level of the soil and the type of limestone being used. Agricultural lime is typically used for this purpose, and it comes in various forms, including powdered lime, pelletized lime, and dolomitic lime. The type of lime and the amount needed will depend on the specific soil conditions.

The process of neutralizing soil with limestone is relatively straightforward and can be done by following these steps:

1. Test the soil to determine the pH level and the amount of limestone needed.

2. Choose the appropriate type of limestone based on the soil test results.

3. Spread the limestone evenly over the soil surface.

4. Mix the limestone into the soil using a rototiller or other tool.

5. Water the soil thoroughly.

It's important to follow the recommended application rate for limestone, as over-application can lead to an alkaline soil, which can also be harmful to plants. Regular soil testing is recommended to monitor the pH level and adjust the limestone application as needed.