Soil Test Interpretation: Fertilizer Program for Northern Ohio Clay Lawn

Reader Question: Soil Test Results (pH 7.0, Low N, Low P, K 139, Ca 3123, Mg 309) – Need Fertilizer Plan

"Northern Ohio, clay soil. pH 7.0, buffer pH 7.1. Nutrients: N (NO3 7, NH4 4 ppm), P not stated, K 139, Ca 3123, Mg 309. Fertilizer program?"

Expert Answer: Ideal pH, High Ca/Mg Ratio, Low Nutrients Overall

• pH 7.0 – Good for turf; do NOT lime (Ca already high).
• Ca:Mg ratio high – Avoid calcium amendments.
• Low N, P, K – Soil needs balanced feeding.

Recommended Program

1. Spring: 10-10-10 at 10 lbs/1000 sq ft.
2. Fall: Switch to lawn fertilizer (29-3-4, 33-3-3) at 3 lbs/1000 sq ft per application.
3. One-time Mg boost: Epsom salt (magnesium sulfate) at 1–2 lbs/1000 sq ft.
4. Water in well after each application.
5. Ongoing: Spring + fall lawn fertilizer only. No summer feeding.

Assumption: grass crop. If different crop, adjust accordingly.