A field experiment was conducted on Ocimum basilicum L.cv. Citral, which was treated with 1 ton /ha Calcium sulphate (Caso42H2O), to study its impacts on soil chemical properties like PH, EC, Calcium, Magnesium, Carbonates and Bi-carbonates and Sulphates. The field was designed as RCBD with four replications. Observations were recorded for 15, 45, 75,105 days after planting. The results indicated that after 105 days after planting, Bicarbonates, Calcium, Magnesium, Chlorides and Sulfates content of the soil water increased due to gypsum application. No changes were seen in case of PH.