Send soil samples to a lab or extension service

Collect soil from 6-8 spots across your garden at 6-8 inches deep, mix in a bucket, and submit 1-2 cups to your county cooperative extension service or a soil testing lab. Results typically include pH, macronutrients (N, P, K), micronutrients, organic matter percentage, and specific amendment recommendations.

Why It Works

Lab analysis uses standardized methods that produce precise, repeatable measurements. Extension labs provide tailored recommendations for your region and crops. This is the only reliable way to know exactly how much lime, sulfur, or fertilizer to apply.

Tips

• Costs $15-30 through a state extension service; some states offer free testing
• Test every 2-3 years, or annually if actively correcting a deficiency
• Test in spring before amending and planting for best timing
• Lab testing is far more reliable than home test kits for amendment decisions