A pH can be raised by adding which chemical?

Raising the pH of soil is essential for managing acidity and creating a more favorable environment for plant growth, particularly for crops that thrive in alkaline conditions. Lime, which is primarily composed of calcium carbonate, is the most commonly used amendment for increasing soil pH. When lime is added to the soil, it reacts with the hydrogen ions present, effectively neutralizing acidity and increasing the pH level.

This process not only reduces overall acidity but also improves nutrient availability, as many essential nutrients are more accessible in a neutral to slightly alkaline pH range. Therefore, the role of lime in soil management to raise pH is well established and widely practiced in agriculture and gardening.

In contrast, the other options do not have the same effect on soil pH. Gypsum is primarily used to improve soil structure and drainage and does not affect pH significantly. Sulfur, on the other hand, is used to lower pH, making it useful for acidifying soils. Compost can enhance soil health and provide nutrients but does not reliably increase pH levels. Thus, the addition of lime stands out as the effective choice for raising soil pH.