There’s a greater risk of loss when nitrogen is applied in the fall. Dr. Greg Schwab, director of agronomy at Koch Agronomic Services (KAS), offers fall application tips to help protect nitrogen and growers’ investment in this vital input.
- For most regions, anhydrous ammonia is the preferred fertilizer for fall applications on acres that will be planted the following spring. That’s because ammonia converts to nitrate in the soil more slowly than other forms of nitrogen.
- With anhydrous, accepted best management practices call for application only after soil temperatures drop to 50 degrees and lower.
- UAN is vulnerable to fall nitrogen loss because it begins to release nitrates at the time of application.