The effect of salt stress on four varieties of blackgram (ADT6, CO6, VBN6, VBN8) were studied under hydroponics during seedling stage. Results indicate that salt stress decreases shoot length and leaf area at seedlings stage. The effect of salt stress on root growth varies with intensity of the stress level. Proline content increases under salt stress in blackgram. This study will be used for identifying the varieties that confers tolerance during salt stress.