- Lime: Lime is the most common soil amendment used to reduce acidity. It contains calcium and magnesium carbonates which help to neutralize the acids in the soil. It is important to use agricultural lime, not quicklime, as the latter can be harmful to plants.

- Wood ash: Wood ash is a natural source of potassium and calcium carbonate, which can help to reduce soil acidity. However, it is important to note that wood ash can also raise the pH of the soil too much, so it should be used in moderation.

- Bone meal: Bone meal is a slow-release source of nitrogen, phosphorus, and calcium. It can help to reduce soil acidity and improve soil fertility.

- Dolomite lime: Dolomite lime is a natural source of calcium and magnesium carbonate. It is similar to lime, but it contains a higher percentage of magnesium.

- Oyster shells: Oyster shells are a natural source of calcium carbonate. They can be crushed and added to the soil to help reduce acidity.

- Potassium carbonate: Potassium carbonate is a soluble salt that can be used to reduce soil acidity. However, it is important to use it in moderation as it can raise the pH of the soil too much.

- Baking soda: Baking soda is a common household product that can be used to reduce soil acidity. However, it is important to use it in moderation as it can raise the pH of the soil too much.

- Epsom salts: Epsom salts is a compound that contains magnesium sulphate, it is often used to reduce soil acidity and provide plants with magnesium.

It is important to note that the amount of soil amendment you need to add will depend on the pH of your soil and the type of soil you have. It is always best to test your soil before adding any amendments.