Thiourea is a sulphatral compound containing -SH group which has been considered responsible for various physiological and molecular activities in plants. Application of thiourea as seed treatment and foliar spray has been reported to enhance photosynthetic efficiency, transport of assimilates to grains and harvest inter in a number of crops such as wheat, pearl millet, maize and legumes. Thiourea has been found to delay leaf scensace, chlorophyll degradation and act as scavenges for ROS species such as H2O2 and superoxide. There effects have been attributed to enhance seed yields, dry matter accumulates on harvest index and water use efficiency in different plants under the rainfed conditions. Recently thiourea has been found to impart water Indian in beneficial mustard and maize under saline conditions. The salt tolerance effects of thiourea have been associated with its role at physiological and molecular levels encomposting photosynthetic efficiency, nitrogen metabolism,antioxidant defence and stress tolerance under water limited conditions. Furthermore, it has shown additive effects with P and N nutrition on plant growth and leaf metabolism.