Öz

Nitrogen fertilization is a costly and difficult issue in wheat production. While optimizing nitrogen management increases yield and quality, ıt reduces the negative effect of excess nitrogen on the environment. The application of nitrogen fertilizers in three periods, with sowing, in tillering and possibly in flowering, increases the nitrogen uptake efficiency. The nitrogen fertilizer in development period increases the grain yield, while fertilizer in last period increases the protein ratio. When determining the amount of nitrogen to be applied, it is essential to know the amount of nitrogen in the soil, the yield, the expected yield. Expected yield; it is accepted as 5% more than the average value obtained by subtracting the lowest and highest yields in the last few years. If the yield and protein ratio determine in the harvesting period, the results will provide insight into the correctness of the fertilization and will refer to next years. If the protein is high, it is mean that over fertilized, while if it is low, it is mean that insufficient fertilized.