Which materials are used to lower soil pH?

To effectively manage soil pH, acidifying agents are specifically formulated to lower pH levels, making them the most suitable choice for this purpose. These materials typically include substances such as sulfur, ammonium sulfate, and iron sulfate, which release hydrogen ions into the soil when they react, thus decreasing the pH.

Lowering soil pH is crucial in situations where certain crops do not thrive in alkaline or neutral soils; for example, many fruits and vegetables prefer slightly acidic soils. By applying acidifying agents, growers can create a more favorable environment for their crops, improving nutrient availability and overall plant health.

The other materials listed are unrelated or have different functions concerning soil pH. Calcium compounds, for instance, are primarily used to raise pH levels and enhance soil structure, while alkaline agents are used to neutralize acidity and increase pH. Organic fertilizers can sometimes affect soil pH slightly but are not specifically used for the purpose of lowering it. Therefore, acidifying agents are the most effective choice for achieving the intended outcome of reducing soil pH.