Agronomy blog · May 23, 2025
Sulfur for Corn and Soybeans: Signs of Deficiency
How sulfur deficiency shows up in corn and soybeans—and why cleaner air and modern hybrids made sulfur a bigger Midwest conversation.
Why sulfur talk got louder
Atmospheric sulfur deposition dropped as air got cleaner, while yields rose. That combination put sulfur deficiency on more Midwest scouting lists—especially on lighter soils and fields without manure history.
In corn, yellowing of newer leaves can signal sulfur issues; confirm with tissue tests because nitrogen shortage can look similar in some conditions.
Corn and soybean decision points
Soil tests, tissue tests, and yield response history guide whether to include sulfur in starter, sidedress, or foliar plans. Source and timing should match your nitrogen system so you are not making an extra trip without reason.
Soybean sulfur needs are real on some farms but still deserve documentation before every acre gets the same rate.
Plan sulfur with the rest of fertility
Do not treat sulfur as an isolated jug. Fold it into your nitrogen and micronutrient plan. Roush Ag Solutions can help you explore options and call-for-price availability for sulfur-related nutrition products.
Always verify rates, crops, tank-mix partners, and restrictions on the product label and SDS before you spray. This article is educational guidance for Midwest farmers—not a substitute for label directions or local agronomic advice.