EN
The quality of wheat grain determines the quality of flour and this becomes important in subsequent processing stages and impacts the end products. The objective of the studies was to determine whether a method of applying nitrogen both with and without compound fertilizers at different growth stages of spring wheat impacted the crop yield and qualitative parameters of grain and flour. A three-year field experiment was in north-eastern Poland at the Teaching and Research Station of the University of Warmia and Mazury in Olsztyn. Spring wheat was cultivated with the application of different treatments of nitrogen fertilization with a total dose of 120 kg ha-1. The nitrogen fertilizers were applied to the soil or to soil and on leaves (foliar application) with and without microelements at the following growth stages: tillering, stem elongation and heading. It was concluded that the fertilization methods did not impact the grain yield. Soil urea application at doses of 40 kg ha-1 at the tillering and stem elongation stages mostly increased the protein content in grain and flour, vitreousness of grain, gluten content and alveographic – W parameter compared to the other fertilization variants. Soil application of the fertilizer with macronutrients and trace minerals generally produced worsened grain parameters, especially the protein grain content and the Zeleny index. The weather conditions most affected the grain yield and such grain and flour parameters as kernel weight, kernel diameter, hardness index and P/L index. The soil urea application at a dose of 40 kg ha-1 at the elongation stages contributes to better grain quality than foliar application of urea at doses of 20 kg N ha-1 at the stem elongation and heading stages