To investigate the effects of different natural substances (without soaking, soaking in distilled water, 100, 200 and 300 ml/L of moringa leaf extract, alga's extract at 75, 150 and 225 ml/L and 100, 150 and 200 ml/L of yeast extract) to improve seedlings parameters of sugar beet Hossam cultivar under salinity stress conditions (0, 20, 40, 60, 80, 100 and 120 mM of NaCl), at the Faculty of Agriculture, Agronomy Department, Mansoura University, Egypt, an experiment was conducted in an experimental setting in the month of October 2022. The experiment was carried out as a factorial experiment with a completely randomized design. (CRD). The highest values of root & shoot lengths; seedling length and seedlings vigor index of sugar beets were obtained from the control treatment (no salinity stress), followed by treatments with salinity stress at levels of 20, 40, 60, 80, and 100 mM of NaCl. Soaking sugar beet seeds in moringa leaf extract at 300 ml/L resulted in the highest values of root & shoot and seedling lengths and seedling vigor index. It may be advised to soak seeds for 18 hours in moringa leaf extract (MLE) at a concentration of 300 ml/L, yeast extract (YE) at a concentration of 200 ml/L, or algal extract (AE) at a concentration of 225 ml/L to improve sugar beet Hossam cultivar seedling parameters under salinity stress conditions.