Sulfur Nutrition Management
from Field To Yield: Crops & Comments Hosted by Geoff Reeves
Did you know that cleaner air has quietly turned sulfur into a yield-limiting nutrient for row crops in North Carolina and South Carolina? In this week's episode, we sit down with an agronomy expert to unpack the "Clean Air Act effect." With power plant sulfur dioxide emissions down 95% since 1990, the "free" atmospheric sulfur that used to mask soil deficiencies is practically gone. We dig into the inseparable biochemical link between nitrogen and sulfur — and explain why piling on more nitrogen won't fix a sulfur problem, and will actually just drive nitrate accumulation and poor crop protein. Key topics covered in this episode: The Soil Risk — Why deep, sandy, low-organic-matter Coastal Plain soils (like Candor and Conetoe) are the most vulnerable to sulfur leaching. Testing Tactics — Why standard soil tests are notoriously unreliable for sulfur, and how to properly diagnose issues with plant tissue testing. The N:S Ratio Debate — A nuanced look at whether to rely on the traditional 15:1 to 20:1 nitrogen-to-sulfur tissue ratio, or follow newer research that judges nitrogen and sulfur on their individual sufficiency. Fertilizer Strategy — The benefits of treating at-risk fields with immediately available sulfate-based fertilizers (like AMS or ATS) rather than relying on slow-releasing elemental sulfur for a quick correction. Economic ROI — The break-even math showing why 15–25 lbs of sulfur per acre is a low-cost investment that pays for itself in responsive crops.
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