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Does the potential ammonium fixation of soils have an impact on the optimum nitrogen fertilizer rate?
- Seçer, Müzeyyen, Elmaci, Ömer Lütfü, Erdemir, Oya
- Communications in soil science and plant analysis 2018 v.49 no.12 pp. 1522-1529
- Triticum aestivum, ammonium, ammonium nitrate, ammonium nitrogen, ammonium sulfate, fertilizer rates, field experimentation, grain protein, grain yield, harvest index, nitrogen, nitrogen fertilizers, soil, urea, wheat
- Field 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.