How to Read a Soil Test Report: A Homeowner’s Guide

You sent your soil sample to the lab (or used a home kit) and got results back. Now you’re staring at numbers like “6.2 pH” and “14 ppm phosphorus” wondering what it means. Let’s break it down.

The Key Numbers

pH Level (Most Important)

Ideal for most lawns: 6.0 - 7.0
Below 6.0: Too acidic — add lime
Above 7.5: Too alkaline — add sulfur
Why it matters: Wrong pH locks out nutrients even if they’re present in soil

Nitrogen (N)

Most labs don’t test nitrogen because it changes rapidly. Instead, they recommend application rates based on your grass type and goals. Follow their rate — more isn’t better.

Phosphorus (P)

Low (<15 ppm): Add a starter fertilizer with phosphorus
Medium (15-30 ppm): You’re fine — use regular fertilizer
High (>30 ppm): Skip phosphorus entirely — excess runs off into waterways

Potassium (K)

Low (<100 ppm): Add potash (0-0-60) or a fertilizer with K
Medium (100-200 ppm): Adequate for most lawns
High (>200 ppm): No action needed

Organic Matter

Below 2%: Add compost topdressing
2-5%: Good range for lawns
Above 5%: Excellent — your soil is healthy

What to Do With Your Results

Fix pH first — nothing else works if pH is off
Address deficiencies — only add what’s actually low
Don’t over-apply — excess fertilizer burns grass and pollutes water
Retest in 2-3 years — soil changes slowly

Common Mistakes

Guessing instead of testing: A $15 soil test saves you hundreds in wasted fertilizer
Adding lime “just because”: Only add lime if pH is actually low
Ignoring the report’s recommendations: Labs customize advice to your specific results — follow it

If you haven’t tested yet, the MySoil Soil Test Kit is a solid mail-in option, or grab a Luster Leaf Rapitest for quick at-home readings.

Your soil test is basically a prescription for your lawn. Follow it, and you’ll spend less money on products while getting better results. That’s a win-win.