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.