Seçer M.Elmaci Ö.L.Erdemir O.2019-10-262019-10-2620180010-36240010-3624https://doi.org/10.1080/00103624.2018.1474363https://hdl.handle.net/11454/15921Field experiments were conducted to determine the effect of nitrogen (N) fertilizer forms and doses on wheat (Triticum aestivum L.) on three soils differing in their ammonium (NH4) fixation capacity [high = 161 mg fixed NH4-N kg-1 soil, medium = 31.5 mg fixed NH4-N kg-1 soil and no = nearly no fixed NH4-N kg-1 soil]. On high NH4 + fixing soil, 80 kg N ha-1 Urea+ ammonium nitrate [NH4NO3] or 240 kg N ha-1 ammonium sulfate [(NH4)2SO4]+(NH4)2SO4, was required to obtain the maximum yield. Urea + NH4NO3 generally showed the highest significance in respect to the agronomic efficiency of N fertilizers. In the non NH4 + fixing soil, 80 kg N ha-1 urea+NH4NO3 was enough to obtain high grain yield. The agronomic efficiency of N fertilizers was generally higher in the non NH4 + fixing soil than in the others. Grain protein was highly affected by NH4 + fixation capacities and N doses. Harvest index was affected by the NH4 + fixation capacity at the 1% significance level. © 2018, © 2018 Taylor & Francis.en10.1080/00103624.2018.1474363info:eu-repo/semantics/closedAccessAgronomic nitrogen efficiencyammonium fixation capacityfield experimentsharvest indexN fertilizerswheatyieldArticle491215221529Q2