Using a high performance liquid chromatography, two kinds of plant hormones (IAA and GA 3) were identified from earthworm ( Pheretima sp.) casts. Concentrations of the IAA and the GA 3 in the earthworm casts were 13 9 mg/kg and 44 9 mg/kg, respectively, approximately 13 6 and 7 4 times higher than that in the surrounding soils. Bioassay of mung bean cutting was carried out with 11 different test liquids, including cast extract (1∶2,w/v), parent soil extract (1∶2,w/v), Haogland nutrient solution, di...