Corn and soybean farmers often apply fertilizer in November. Experts say timing is key

Fertilizer Application Timing is Crucial for Corn and Soybean Farmers

Corn and soybean farmers often apply fertilizer in November, with roughly 25% to 50% of the total commercial nitrogen applied to fields across the state occurring in the fall.

Experts emphasize that timing is key to preventing nitrates from flushing into streams and rivers. Waiting for cooler soil temperatures helps mitigate this issue.

Richard Roth, a nutrient management specialist with Iowa State University Extension and Outreach, said the primary motivation for farmers to apply fertilizer in the fall is to spread out the workload.

Agronomists stress that the type of fertilizer and timing are critical to prevent nutrients from flushing into waterways. Applying fertilizer in the fall allows farmers to avoid the challenges of spring rainfall and muddy fields, which can limit the window for applying fertilizer and planting seeds.

Author's summary: Fertilizer application timing is key for farmers.

Iowa Public Radio — 2025-11-03

Fertilizer Application Timing is Crucial for Corn and Soybean Farmers

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