(43) EVALUATION OF BIOWASTE COMPOST APPLICATIONS TO FARMLAND WITH ADDITIONAL MINERAL NUTRIENTS

抄録

Biowaste, the separately collected organic fraction of municipal solid waste, can be reused for soil conditioning after composting. In this study, a series of field investigations was conducted on human health essential minerals, Ca, Fe, Mg, Mn, Zn, Cu and toxic heavy metals, Pb, Cr, Cd in soil which have been amended with biowaste composts only or amended with chemical fertilizer plus lower composts. The results show that the biowaste compost applications likely led to the increases of mineral elements in soils for Ca, Mg, Mn and Zn excluding some exception. It was also found that biowaste compost applications have shown the tendency of the increases of bio-available forms of Fe, Mn and the reverse situation for Mg. Comparison of supply ratios (SR = bio-available content/total content×100%) of all elements in compost-amended and no amended soils showed that the leachability of Fe, Mn, Zn, Pb was slightly increased by biowaste compost application, and less changed for other elements.