The efficiency of recycling cattle dung, anaerobically digested cattle dung (biogas plant-effluent) and water hyacinth (Eichhornia crassipes) by culture of the earth- worm Megascolex sp. was studied. The growth of the earthworms was increased by 156, 148 and 119% in soil
supplemented with water hyacinth, cattle dung and biogas plant-effluent, respectively. The growth rate of the earthworms was increased significantly by raw cattle dung and water hyacinth over that by biodigested slurry.