Which amendment would be used to lower soil pH toward the vegetable range?

Which amendment would be used to lower soil pH toward the vegetable range?

• A. Ground limestone
• B. Sulfur
• C. Wood ashes
• D. Complete fertilizer

Answer: (B)

Lowering soil pH to suit many vegetables relies on using an amendment that adds acidity to the soil rather than alkalinity. Elemental sulfur is the classic choice because soil microbes convert it into sulfuric acid, which increases the hydrogen ion concentration in the soil solution and lowers pH over time. As a result, the soil moves toward the slightly acidic range that many vegetables prefer, typically around pH 6.0 to 6.8. This happens gradually, often taking weeks to months, especially in cooler or drier conditions. You’ll want to mix the sulfur evenly into the root zone and recheck pH periodically as the amendment works and as plants grow. Other common amendments have the opposite effect. Ground limestone neutralizes acidity and raises pH, so it’s used to make soil less acidic. Wood ashes are alkaline and also raise pH. A complete fertilizer supplies nutrients but isn’t used to lower pH reliably; its effect on soil acidity depends on the formulation, and it’s not intended as a pH control tool. So, sulfur is the appropriate choice when the goal is to lower soil pH toward the vegetable-friendly range.

Lowering soil pH to suit many vegetables relies on using an amendment that adds acidity to the soil rather than alkalinity. Elemental sulfur is the classic choice because soil microbes convert it into sulfuric acid, which increases the hydrogen ion concentration in the soil solution and lowers pH over time. As a result, the soil moves toward the slightly acidic range that many vegetables prefer, typically around pH 6.0 to 6.8.

This happens gradually, often taking weeks to months, especially in cooler or drier conditions. You’ll want to mix the sulfur evenly into the root zone and recheck pH periodically as the amendment works and as plants grow.

Other common amendments have the opposite effect. Ground limestone neutralizes acidity and raises pH, so it’s used to make soil less acidic. Wood ashes are alkaline and also raise pH. A complete fertilizer supplies nutrients but isn’t used to lower pH reliably; its effect on soil acidity depends on the formulation, and it’s not intended as a pH control tool.

So, sulfur is the appropriate choice when the goal is to lower soil pH toward the vegetable-friendly range.