IPI International Potash Institute
IPI International Potash Institute

Research Findings: e-ifc No. 39, December 2014

Wheat experiment setup. Photo by authors.

Effects of Potassium and Nitrogen Applications on the Yield and Yield Components of Bread and Durum Wheat

Dilek Anaç(1), Cenk Ceyhun Kılıç(2), Özlem Gürbüz Kılıç(3), Nevin Eryuce(1), Bihter Çolak Esetlili(1), Gülen Gonca Mersin(1), Barkın Kulahoglu(1) and Özgür Çobanoglu(1)
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(1)Ege University, Faculty of Agriculture, Bornova, Izmir, Turkey
(2)Ege University, Bayindir Vocational Training School, Bayindir, Izmir, Turkey
(3)Celal Bayar University, Akhisa Vocational Training School, Akhisar, Manisa, Turkey
Corresponding author: Dilek Anaç


This study reports on an investigation made at the Ege University experimental farm (Izmir, Turkey), with soil low in available potassium (K), on the effects of different rates of potassium (K2O) and nitrogen (N) fertilization on two different wheat varieties, one bread wheat (Galil) and the other a durum wheat (Ege 88). Measurements were made on yield, yield components, elemental composition, N use efficiency (NUE %) and the N derived from the N fertilizer (Ndff %). In general, grain and straw yields were higher for the bread than the durum wheat for corresponding N and K applications. However, the highest yield was found at the highest N and K rates applied to durum wheat. NUE % was also Research Findings high in the highest rate of K application, at 1% level in the bread wheat and 5% in the durum wheat. The N derived from the N fertilizers increased as the N and K rates increased. It can be concluded that the N1 level (150 kg ha-1) of the studied N doses can be accepted as the most economic dose for both bread and durum wheat varieties in terms of N fertilization. For the bread variety, the lowest dose of K fertilization (K0), i.e. soil K, could be considered adequate under rainfed (244 mm) conditions in the Ege region of Turkey. On the other hand, the grain and straw yields of the durum wheat significantly increased with increasing doses of K up to N1.5 (225 kg N ha-1) application. The highest K fertilization level (225 kg K2O ha-1) at the highest N level (225 kg N ha-1) can thus be recommended for this variety provided that it is economically viable.

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