Which type of amendment can help to reduce soil acidity?

Lime is the amendment that effectively reduces soil acidity. When lime is applied to acidic soil, it reacts with the soil's hydrogen ions, which are responsible for acidity, thereby increasing the pH level. This process helps create a more favorable environment for plant growth and improves nutrient availability. Lime contains calcium carbonate or calcium hydroxide, which not only neutralizes acidity but also adds essential calcium to the soil. This helps in promoting healthy root systems and overall plant health.

In contrast, gypsum serves primarily to improve soil structure and drainage without altering soil pH. Compost enriches the soil with organic matter and nutrients but does not specifically target acidity levels. Sulfur, on the other hand, is an amendment used to decrease pH, thus increasing soil acidity, making it counterproductive in this context. Therefore, lime is the straightforward and effective solution for reducing soil acidity, making it the correct choice.