Jacobs Turf — soil-first lawn care in Atlanta
Atlanta soil samples analyzed in the JT Lab archive

The JT Lab · Open data

What Atlanta soil actually looks like

We have run 99 anonymized soil tests through the UGA lab. It is the clearest picture anyone has of what is under Atlanta lawns — and nobody else in the city has published it.

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The archive · n=99

The headline: the food is already in the ground

Across 99 Atlanta lawns, the macronutrients come back fine and the gap is structure — pH and a small nutrient tank, not fertilizer. Zero calcium deficiencies, zero magnesium, three potassium shortfalls out of 99. Here is the whole dataset.

6.24
Median pH
Slightly acidic — most want a touch of lime, not the blanket dose they usually get.
35%
Came in acidic
Below pH 6.0, where nutrients start locking up.
7.39
Median CEC · n=90
A small tank — the mineral, not a defect. The lab calculates it from calcium.
0
Calcium deficiencies
Zero across all 99. The gap is structure, not nutrients.
Range across the 99: pH 5.04 – 8.13 · CEC 4.3 – 38.6 meq/100g (n=90) · median calcium 1,982 lb/A, UGA "Very High". UGA / Fulton County Extension lab · Mehlich-1 extraction · values in lb/acre · client names and addresses stripped.

Distribution · n=99

Where the pH lands

Below 5.5 · very acidic11
5.5 – 5.9 · acidic24
6.0 – 6.4 · slightly acidic26
6.5 – 6.9 · near ideal15
7.0 and up · neutral+23
35% below pH 6.0 (needs lime) · 41% in range · 23% at 7.0+ (should never be limed).

Distribution · n=90

Where the CEC lands

Under 6 · very low17
6 – 7.9 · low33
8 – 9.9 · moderate16
10 – 14.9 · good16
15 and up · clay-rich8
9 samples ran the basic panel (no CEC) · 56% under 8. The lab calculates CEC from calcium — it is not measured directly, so lime alone can nudge it without the soil holding more.

Rating distribution · UGA bands

Where the nutrients land

Share of lawns in each UGA Piedmont / Lawns band (lb/acre) — the food is mostly already there.

Phosphorus (P)
Potassium (K)
Calcium (Ca)
Magnesium (Mg)
LowMediumHighVery High

Methodology

UGA / Fulton County Extension lab · Mehlich-1 extraction · values in lb/acre · client names and addresses stripped. Bands from UGA's Soil Test Handbook for Georgia (SB-62). Two more reports (12 samples) are still being recovered; the archive will grow to 111.

Where does your lawn fall?

Get your own lawn into the dataset — a real lab test, read out in plain English.

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