Abstract:

A field experiment was conducted to study the heavy metals accumulation in soil and winter wheat supplied with different rates of sewage sludge and chemical fertilizer. The results showed that the content of Zn、Cu、Cd、As、Hg in soil were increased responding to sewage sludge proportion. The same tendency with Zn、As、Cr in wheat. The content of Hg, Cd, Pb, As, Zn, Cu, Cr and Ni were not exceed the second class of the standard of soil environmental quality. Hg, Cd, Pb in wheat grain were not exceed the national food and healthy standard value. While As content was exceeded standard value by 0.02 mg/kg at the amount of 1800kg/hm2 level of sludge compost. Zn、 Cu content in straw was lower than grain, and other heavy metals content was 2-40 times of grain. So in a short time, proper amount of sewage sludge fertilizer will not caused pollution in soil, or bring effects in edible part, either. But years of repeated application demand timely monitoring.