Abstract
Much of the N applied to rainfed winter wheat (Triticum aestivum L.) is topdressed as granular fertilizer in late winter or early spring after growers evaluate over-winter survival and potential economic returns from N fertilization. Information is needed to determine the optimum timing for efficient use of topdressed N by winter wheat. This study evaluated the effect of three rates (0, 40, and 80 Ib N/acre) of ammonium nitrate on winter wheat grain yield, N uptake, grain protein, and net income when topdressed at or near planting through heading (1 April) on silty clay and clay soils. Field experiments were conducted at five different sites during the 1985, 1987, 1988, 1991, and 1992 winter wheat growing seasons on Udorthentic Haplustoll and Udic Pellustert soils located in the North Texas Blackland [...]
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