Abstract
Wet soils, a consequence of poor drainage common to soils in the winter wheat (Triticum aestivum L.) producing areas of the southern Midwest USA, frequently hamper spring topdress fertilizer applications and reduce N efficiency. This 2-yr field study was an effort to identify alternative N management techniques that could be successfully implemented at either preplant or topdress application time. The effects of urea-ammonium nitrate (UAN) time of application, method of application, and rate of dicyandiamide (DCD) nitrification inhibitor on the flag leaf N, grain N, and grain yield of winter wheat were measured in 1990 and 1991 at the University of Illinois Brownstown Agronomy Research Center on a Cisne silt loam soil (fine, montmorillonitic, mesic Mollic Albaqualf) []
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