Relevance. The article quotes questions of the influence of fertilizer rates and the number of irrigations on the change in the nutrient regime of the soil when growing mixed crops of pea and sorgho in the conditions of the Karabakh zone of Azerbaijan. In this regard, one of the main issues considered was the development on a scientific and practical basis of the nature of changes in the nutrient regime of the soil and the effect of optimal fertilizer rates and the number of irrigations on crop yields in mixed crops in long-irrigated gray meadow soils.Methods. To study the effect of irrigation and fertilizer rates in mixed crops on changes in the nutrient regime of the soil, soil samples were taken from two soil layers (0-30 and 30-60 cm) after cutting. In the soil samples taken, compounds of nitrogen, phosphorus and potassium that are readily absorbed by plants were analyzed.Results. Analysis of soil samples shows that the application of mineral and organic fertilizers against the background of different amounts of irrigation fundamentally affects the effective fertility of the soil. In general, in the phase of flowering and panicle formation under the influence of irrigation and fertilizers, effective soil fertility was observed compared to the control variant without fertilizing, which remained at a sufficient amount. And this indicates that the plant showed a high demand for this nutrient. The decrease in the number of nutrients in the panicle formation phase indicates its connection with the removal of high yields. Analysis of soil samples during the study shows that the introduction of mineral and organic fertilizers against a background of varying amounts of irrigation has fundamentally affected the effective soil fertility.