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Ammonia volatilization from urea reduced N fertilizer efficiency of crops. Addition of acidic materials to urea may reduce NH3 volatilization and improve N use efficiency. The objectives of this study were to compare the effects of compacted or blended mixtures of urea and triple superphosphate (TSP), urea and KCl, or urea, TSP, and KCl on NH3 volatilization and N use efficiency by corn Zea mays L...