Liquid fertilizer containing amino acid proline (L-Proline), macro and micro elements. Phosphorus is very important for plant vegetation, it is a nutrient element which regulates vital processes and growth. It is especially important in early development stages. Potassium increases resistance to low temperatures, controls function of the stoma in leaves and thus reduces loss of water in the plant. Complex of macro and micro elements in the fertilizer stimulates vegetative and generative development of a plant. The nutrient complex is particularly suitable for use in cereals. L-Proline amino acid is important in more than ten plant growth and development processes, such as regulation of osmotic pressure, regulation of gas exchange in leaves, seed swelling, stimulation of pollen germination, promotion of photosynthesis, regulation of chlorophyll formation.