Application for horticultural nursery soil of sludges produced from water purification of mixing with hull and animal compost

1) Cation exchange capacity, pH, exchangeable cation of sludges produced from water purification were unchanged through a year, but total-nitrogen, total-carbon, inorganic nitrogen, water-soluble manganese, exchangeable-manganese of sludges were high content from March to July, and soluble aluminium was high content from March to June. 2) 1N HCl soluble arsenic and 0.1 N HCl soluble copper in reference to soil pollution-prevention law were lower than basic allowable content. But, total-zinc was higher than provisional administration basic allowable content. 3) By mixing with sludges, hull and animal compost in a volume ratio of 10 : 3 : 1, exchangeable-manganese of sludges after several month became low content, also effective phosphoric acid of sludges became hight content. Animal compost of mixing with sludges was adapted for sawdust cattle feces compost. 4) Vegetables growth in non-mixing sludges became a little for manganese excess symptom ; on the other hand, vegetables growth in sludges of mixing hull and sawdust cattle feces compost was similar to that compared with control-nursery soil. 5) By practicing steam sterilization in condition over 80℃, exchangeable-manganese of sludges of mixing hull and sawdust cattle feces compost became high content. Therefore, steam sterilization had to be practiced in the condition below 70℃.