The study aimed to assess the effects of compost applications on soil fertility, sugar beet performance, and the survival of Sclerotium rolfsii. The study utilized a repeated-measures design with five compost application rates (0, 10, 20, 30, and 40 t ha(-1) year(-1)) with four replicates. Compost was applied to the plots before sugar beet sowing in each season. Selected soil properties were measured twice during each season after compost application. A germination test for S. rolfsii was conducted once per season before harvest, whereas sugar beet yield and technological quality were measured during the harvest. The irrigation water used had an electrical conductivity of 5.64 dS m(-1), and other agricultural practices followed the regional commercial beet production guidelines. The application of compost did not have a significant impact on soil salinity. The relationships between chemical properties and compost rates were significant (p<0.0001) in the second season. The soil chemical properties showed significant temporal variations. Significant (p<0.0001) relationships were found between compost rates and sugar beet parameters. The maximum root yield and technological quality were observed at 20 t ha(-1), with soil nitrogen immobilization. The germination test for viable sclerotia of S. rolfsii was significantly (p<0.0001) affected by compost rates, primarily because of the effects of humic acids on Fe, Zn, and B. Negative test results were obtained for 40 t ha(-1) in the first season and using 30 t ha(-1) for two seasons. Based on the study conditions, compost was applied at a rate of 20 t ha(-1) year(-1) to enhance beet yield and technological quality, at 30 t ha(-1) year(-1) to reduce the inoculum density of S. rolfsii, and 40 t ha(-1) year(-1) to improve soil fertility.