A soil test tells you exactly what nutrients your Oklahoma lawn needs and what it doesn’t, eliminating guesswork from your fertilization program. Most Oklahoma soils are alkaline (high pH) and often deficient in nitrogen while having adequate phosphorus. Without a soil test, you’re either wasting money on nutrients you don’t need or starving your lawn of what it’s missing. Complete Lawn Care offers soil testing as a service and recommends homeowners test their soil at least once a year for best results.
Why Soil Testing Matters
Think of a soil test as a blood test for your lawn. Just like a doctor wouldn’t prescribe medication without understanding what’s wrong, you shouldn’t fertilize without knowing what your soil actually needs.
Stop wasting money: Many Oklahoma soils already have plenty of phosphorus. If you’re applying a fertilizer with phosphorus you don’t need, you’re literally throwing money on the ground.
Fix hidden problems: Yellow grass isn’t always a nitrogen problem. It could be iron deficiency (common in our alkaline soils), pH issues, or other micronutrient problems. A soil test identifies the real cause.
Understand your pH: Soil pH affects how well your grass can absorb nutrients. If pH is too high or too low, fertilizer won’t help because the grass can’t use it. Oklahoma soils typically run alkaline (above 7.0).
Prevent environmental damage: Excess fertilizer doesn’t just disappear. It runs off into waterways and causes pollution. Applying only what you need is better for your wallet and the environment.
What a Soil Test Measures
pH level: Measures acidity or alkalinity on a scale of 0-14. Most lawn grasses prefer 6.0-7.0 (slightly acidic to neutral). Oklahoma soils often test 7.5-8.0 or higher.
Nitrogen (N): The nutrient most responsible for green color and leaf growth. Most Oklahoma lawns need regular nitrogen supplementation.
Phosphorus (P): Important for root development. Many Oklahoma soils have adequate phosphorus, so you may not need to add more.
Potassium (K): Helps with overall plant health, disease resistance, and stress tolerance. Important for Oklahoma lawns facing summer heat.
Micronutrients: Iron, zinc, manganese, and others. Iron deficiency is common in Oklahoma’s alkaline soils and causes yellowing that looks like nitrogen deficiency but doesn’t respond to nitrogen fertilizer.
Common Oklahoma Soil Issues
High pH (alkaline soil): Very common in the Tulsa area. High pH locks up iron and other micronutrients, making them unavailable to grass even when present in the soil. Sulfur applications can help lower pH over time.
Iron chlorosis: Yellowing between leaf veins while veins stay green. Caused by iron unavailability due to high pH. Applying iron supplements and working to lower pH helps.
Heavy clay: Not a nutrient issue, but it affects how nutrients move through soil. Clay holds nutrients well but can become compacted. Aeration helps clay soils function better.
How to Get Your Soil Tested
Option 1: Professional testing through Complete Lawn Care. We collect samples properly, send them to a certified lab, interpret the results, and recommend specific treatments. No guesswork on your part.
Option 2: Oklahoma State University Extension. OSU offers soil testing services. You collect samples, mail them in, and receive results with recommendations. Cost is typically $10-20.
Option 3: DIY test kits. Available at garden centers. These give rough estimates but aren’t as accurate or detailed as lab tests. Better than nothing, but professional testing is more reliable.
How to Collect a Soil Sample
Proper sampling technique matters. Here’s how to do it right:
Take multiple samples: Collect 10-15 small samples from different spots across your lawn and mix them together. This gives an average that represents your whole lawn.
Sample the right depth: For lawns, sample the top 4-6 inches of soil. This is where grass roots live.
Avoid problem areas: Don’t sample from spots near sidewalks (lime leaches from concrete), recent fertilizer spills, or obviously unusual areas. You want a representative sample.
Use clean tools: Use a clean trowel or soil probe. Avoid galvanized or brass tools that can contaminate samples with zinc or copper.
When to Test Your Soil
We recommend testing annually, ideally in fall or early spring before your fertilization program begins. This gives you time to adjust your plan based on results. Also test when you notice unexplained problems that don’t respond to normal treatment, after major landscape changes, or if you’ve never tested before.
Complete Lawn Care’s Approach to Soil Health
At Complete Lawn Care, we believe in treating the cause, not just the symptoms. Our soil testing service identifies exactly what your lawn needs, and our 7-step program can be customized based on your soil’s specific deficiencies. Why guess when you can know?
Contact Complete Lawn. Care:
Phone: (918) 605-4646 | Email: [email protected] | Online: completelawncaretulsa.com/get-a-quote