Effect of Recycled Manure on Drainage Water Quality and Material balance in Paddy Field

Activated sludge is rich in organic matters and some nutrients. Therefore it is significant to reuse composts of sludge for agriculture. In this study, field tests were conducted to investigate effects of compost upon the water environment and accumulation of heavy metals in soil. As for results, it was concluded that fertilizer application of organic manure containing mainly compost of sludge doesn't effect the water environment except a puddling term and it can be protected from the accumulation of heavy metals in the field by the correct control of the organic manure amount.