Cucumber seedlings were exposed to different levels of salt stress, and their responses were studied. The seedlings showed reduced growth, chlorophyll content, and water content under both NaCl and NaHCO3 stress, with NaHCO3 causing greater effects. Na+ content in the shoots increased with stress, while K+ content decreased, especially with NaHCO3. NaHCO3 stress led to higher electrolyte leakage and increased levels of MDA, proline, and soluble sugars in the leaves compared to NaCl stress. Enzyme activities related to stress response were significantly altered under both types of stress.