There have been several reports of corn seedlings being damaged from ammonia, even fall applied anhydrous ammonia. Ammonia injury has been noted in past springs and more frequently occurs with shallow placed ammonia, ammonia applied near the time of planting, urea placed near the seed, and with dry soil conditions.
Iowa State University
Sawyer, John E., "Corn Seedling Damage from Ammonia" (2009). Integrated Crop Management News. 642.
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