An attempt was made to decrease the toxic effect of waste soil from a chlor-alkali factory by Sesbania aculeata.Pers. Sesbania cultivated in varying waste/soil combinations for 35 days added about 120.59% more nitrogen and 220.33% more organic carbon to the medium containing 60% of the waste. Alkaline pH of the waste/soil combinations also decreased with time. After 35 days of incorporation of Sesbania, a significant increase in the growth of rice var. IR 36 was reported over that of control set.