**2. Conclusions**

Water-deficit stress exerted inhibitory consequences on plant morphology, physiological and biochemical parameters that sooner or later decreased the yield of soybean. Drought additionally decreased water content and chlorophyll. On the alternative hand, water-deficit stress improved proline and malondialdehyde content material in soybean leaves. Drought tolerance of soybean became located related to better water content, higher proline and much less malondialdehyde content material, and much less degradation of chlorophyll in the leaf. Salt tolerance in soybean became related to higher water relations, higher osmotic adjustment maintained with the aid of using collecting extra amino acid, sugar, and proline, much less chlorophylls degradation and better photosynthetic efficiency. Waterlogging tolerant soybean plant life capin a position to build up the better quantity of soluble sugars, boom fermentation enzymes and antioxidant protection mechanism under oxygen deficiency.
