Anhydrous Ammonia Application -- Spring 2019
John Sawyer, Professor, Department of Agronomy, Iowa State University
February 26, 2019
It was a late harvest in the fall 2018, soils were wet, and when it was time that anhydrous ammonia could be applied soils became frozen. Those situations resulted in much less than normal anhydrous ammonia application last fall. Therefore, considerable anhydrous ammonia needs to be applied spring 2019. There is only so much capacity to switch from one nitrogen (N) fertilizer product to another. In Iowa, historically the two largest N fertilizers consumed are anhydrous ammonia (largest) and urea-ammonium nitrate (UAN) solution, with granulated urea a distant third. What should be considered if there becomes a tight window of time between ammonia application and corn planting?