How Soil pH Affects Nutrient Availability
Tri-Ag • October 6, 2026

Harvest isn’t just the end of this season. It’s where planning for the next one begins.


As soil samples start coming back this fall, one of the first numbers worth looking at is pH.


Why? Because the nutrients in your soil only have value if your crop can access them.


The Yield Innovations Product Guide illustrates just how much nutrient availability can change as soil pH drops. At a 5.5 pH, the guide shows:


• Nitrogen availability — 77%

• Phosphorus availability — 48%

• Potassium availability — 77%

• Relative soybean N fixation/nodule activity — approximately 40%


Compare that with a 6.8–7.0 pH, where the chart shows 100% availability of N, P and K and 100% relative N fixation/nodule activity.


Before investing in more fertility, make sure you’re getting the most out of what you already have.


Start with the soil test. Start with pH.


Talk with your Tri-Ag agronomist about what your numbers are telling you.


#TriAg #YieldInnovations #SoilTesting #SoilFertility #OhioAg

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