Abstract:

For the purpose of sludge utilization, the effects of sludge on production of rape, salt content and the cumulative variation of Hg, As, Zn in rape and soil were studied by the pot experiment in this paper. The results indicated that sludge could increase rape fresh weight and R/S in a certain range (50 g sludge/pot). When the amount of sludge reached at a large amount (100 g sludge/pot), which affected on rape would decrease obviously. Sludge was better than chemical fertilizer and chicken in promoting rape uptake of N and P. However, the absorption of K was worse than chicken. Sludge was higher than fertilizer and chicken in improving the salt content of soil, but the effect was not obvious .Compared with chemical fertilizer and chicken, the sludge increased soil and rape content of Hg, As and Zn, while the content of Hg increased obviously. After application of sludge, the Hg, As, Zn content of heavy metals of rape and soil are all under the acceptable range according to national vegetable safety standards and soil environmental quality standard (GB15618-1995).