Abstract: To investigate the influences of different organic manures, passivators and their combinations on cadmium content in forage, a field plot experiment was conducted under ryegrass-Guimu 1 hybrid rotation in south China, where the paddy soil is typically acidic and has low Cd environmental capacity. The results showed that the yields of ryegrass and Guimu 1 hybrid increased significantly by 43.1% and 22.7%, respectively, with the fresh weights reaching 3.19×10⁵ and 2.74×10⁵ kg/ha respectively, compared to that of the control after the application of organic fertilizers. Lime, red mud and rice straw exhibited no significant effects on yields. Application of lime, red mud, organic manures and organic manures combined with lime could increase the soil pH, decrease the soil available Cd content and restrain the bio-availability of Cd. However, the application of organic manures increased the residue of Cd in soils. Therefore decreasing the input level of organic manures or using low Cd-content organic manures should ensure the sustainable use of soil. It is not recommended to add passivators such as lime when using Cd-containing organic manures to produce forage under ryegrass-Guimu 1 hybrid rotation in low environmental capacity soils.