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Abstract. Using small-scale sprinkler irrigation machine to irrigate and fertilize can improve water and fertilizer utilization efficiency and increase crop yield. In order to explore the influence of fertilizer concentration on hydraulic performance of rotary sprinkler in the process of water and fertilizer integration, hydraulic parameters of rotary sprinkler were carried out under no wind condition. The fertilizer concentration were 0(water), 5%, 10%, 15%, and 20%, respectively. Potassium chloride fertilizer was used in the experiment, which was injected into pipeline by proportional fertilization pump. The single sprinkler water distribution was measured by catch cans, which were placed along the radial direction of the sprinkler with a spacing of 1 m. The laser precipitation monitor (LPM) was used to measure the droplet diameter and velocity. The variation rules of the wetted radius, water distribution, droplet diameter, and droplet velocity of the nozzle were analyzed. The results showed that the sprinkler wetted radius decreased in a small range with the increasing of fertilizer concentration. The fertilizer concentration had a greater impact on the sprinkler application rate within the distance of 6-9 m from the sprinkler, but less in other places. Fertilizer concentration had a certain effect on the radial distribution of droplet diameter and droplet velocity. The average droplet diameter of fertilizer increased significantly, and the droplet velocity decreased within the distance of 0-6 m from the sprinkler and increased within the distance of 6-8 m compared with water. The results provide a theoretical basis for further research on optimization of technical parameters of water and fertilizer integration for small-scale sprinkler irrigation machine.