What can be used to treat basicity of soil?

To reduce soil basicity (alkalinity), add organic matter such as compost or peat moss. These materials release mild acids as they decompose, helping lower soil pH. You can also use acidifying agents like elemental sulfur, aluminum sulfate, or iron sulfate — but apply them carefully. Gypsum can further improve alkaline soils by replacing excess sodium ions.

Organic Materials

• Compost and Peat Moss: Gradually reduce pH through the release of organic acids during decomposition.
• Humic Acid: Encourages microbial activity that produces natural acids, improving soil acidity over time.

Acidifying Amendments

• Elemental Sulfur: Converts to sulfuric acid via soil bacteria, effectively lowering pH. Apply in summer or fall and mix into the soil before planting.
• Aluminum Sulfate: Reacts with water to form acidic conditions quickly.
• Iron Sulfate: Works faster than sulfur but needs higher quantities. Overuse can harm plants, so use in moderation. It may be mixed into the soil or applied as a liquid.

Other Methods

• Gypsum (Calcium Sulfate): Not an acidifier, but helps displace sodium in high-sodium soils, improving structure and drainage.
• Improve Drainage: Poor drainage can intensify alkalinity; enhancing water flow helps balance pH.
• Avoid Over-Liming: Skip lime or alkaline fertilizers that can further raise soil pH.