Understanding Soil Test Results for Centipede Grass: pH Adjustment, Nutrient Management, and Grub Control

Understanding Soil Test Results for Centipede Grass: pH Adjustment, Nutrient Management, and Grub Control

A soil test showing pH 7.0, low nitrogen, low phosphorus, and low potassium indicates several issues for centipede grass, which prefers acidic soil (pH 4.5–5.5).

Correcting pH

Do not apply lime—that raises pH. Instead, apply elemental sulfur or an acidifying fertilizer to lower pH. Follow label rates based on soil texture and test results.

Addressing Nutrient Deficiencies

• Nitrogen: Apply a centipede-specific fertilizer (low phosphorus, moderate potassium) after green-up. Avoid high-nitrogen products.
• Phosphorus & Potassium: If test shows deficiency, use a balanced fertilizer with appropriate P and K, but centipede generally needs little phosphorus.

Grub Management

Grubs found now are likely not damaging. Treat preventively in July–September with a product containing imidacloprid (Merit) or halofenozide (Mach 2). Spring treatments are ineffective.

Sequence of Operations

1. Adjust pH (sulfur application).
2. Control existing weeds (post-emergent broadleaf herbicide if needed).
3. Fertilize according to soil test and centipede requirements.

Resources

• Centipedegrass Maintenance
• Centipede Lawn Care
• Changing Soil pH
• Clemson HGIC 1650

Follow these steps for a healthier centipede lawn.