Compost and sewage sludge contain high concentrations of plant nutrients and organic matter thus, have been used extensively on farmland as fertilizers. Also, considering the increasing world population and high production of municipal and industrial residuals, land application is probably the best way to avoid the accumulation of these waste materials in the environment. However, high concentration of heavy metals such as Cd in the waste materials may cause pollution of soil and animal and human food chain. The objective of this study was to determine the effects of sewage sludge, compost, animal manure and CdCl 2 on plant yield, some soil properties and concentration of Cd in corn, alfalfa and targetes flower. The study was carried out in a greenhouse using a completely randomized design with four treatments and three replicates. The treatments were: sewage sludge, compost and cow manure applied at and Cd as an inorganic source. Sweet corn, alfalfa and tagetes flower were used for the experiment. Plants were harvested after 60 days of growth. Shoots and roots were separately analyzed for the heavy metals concentration. Application of sewage sludge, compost and cow manure significantly increased organic mater, CEC, EC and DTPA-extractable Fe, Zn, Mn and Ni of the soil. Application of organic manures at the levels of 5 and 10 mgCd kg -1 , caused a significant increase in the concentrations of DTPA-extractable Cd. Extractable Cd content of the soil was significantly lower in the cow manure treatment as compared with compost and sludge treatments. The application of organic materials increased the dry matter weight of the plants. The root and shoot biomass production significantly decreased as the level of Cd increased. The highest mean weight of the corn was observed in the animal manure, whereas yield of alfalfa in the sludge treatment and yield of tagetes flower in the compost treatment were higher. Results indicated that Cd concentration in plants increased with increasing application rate of Cd. Cadmium concentration of plants tissues in sludge and compost treatments was significantly greater than those in animal manure treatment at the same loading rate of Cd. The greatest Cd concentration of the corn shoot was obtained in the compost treatment and Cd concentration of alfalfa and tagetes flower shoots in the sewage sludge treatment was greatest. Cd concentration of the plant tissues in CdCl 2 treatment significantly was highest as compared with the organic manures. Cadmium concentrations in roots of plants were significantly higher than those in shoots. Application of organic manure significantly increased concentration of Fe, Zn, Mn and Ni in plants. Cadmium uptake of the plant in the all treatments Key words: Cadmium, Waste materials, Cadmium salt, Heavy metals