Experiments with the winter wheat (Triticum aestivum L.) variety ‘Sirvinta 1’ were conducted at the Experimental Station of the Lithuanian University of Agriculture (currently – Aleksandras Stulginskis University) during the period 2006–2009 in limnoglacional silty loam on morainne clay loam Cal(ca)ri-Endohypogleyic Luvisol (LVgn-w-cc). The crops were grown on the background of N150P90K90 mineral fertilization and were additionally foliarfertilized with amide nitrogen fertilizer, containing different concentrations (0.5–3.0%) of amino acids, at heading stage BBCH 51–56. Experimental evidence showed that winter wheat grain yield increased by 0.13–0.37 Mg ha-1 under the effect of amino acids. The amino acid fertilizers improved technological properties of grain. Having fertilized with 0.5–2.0% amino acid solutions, the protein content increased by 0.62–0.81 percentage points; having fertilized with 0.5–3.0% solutions the sedimentation values increased by 3–4 ml; and having fertilized with 0.5–1.0% amino acid solutions the wet gluten content increased by 1.1–1.7 percentage points. An increase in the falling number by 22 s occurred having fertilized with 1.0% amino acid solution. The study showed a statistically significant dependence of winter wheat grain yield (η = 0.93*), protein content (η = 0.70*) and sedimentation values (η = 0.98*) on the concentration of amino acids in liquid amide nitrogen fertilizers.