污泥对石灰性熟土和生土肥力与重金属铜锌含量的影响

采用油菜盆栽试验,研究了施用污泥对石灰性生土和熟土有机质、全量和速效养分及重金属铜锌含量的影响。结果表明:施用污泥能够增加土壤中有机质、全氮和全磷的含量;对生土和熟土全钾的影响都不明显;明显增加了土壤速效氮和速效磷的含量;对熟土速效钾影响不大,但可以明显提高生土速效K的含量;随着污泥施用量的增加,生土和熟土中全铜和锌含量均有所增加,且生土中全铜和全锌含量的增加比熟土更明显,但都远低于国家农田土壤质量控制标准(GB 15618—1995)。

Effects of Sewage Sludge on Fertility and the Content of Copper and Zinc in Calcareous Immature and Mellow Soil

This paper studied the effects of sewage sludge on soil OM,total N,P,K and available N,P and K and the content of copper and zinc in Calcareous immature and mellow soil by pot experiment of rape.The results showed that soil OM,total N and P increased with the increase of the amount of sewage sludge.The content of total K did not increase much but the available K increased significantly.The available N,P increased after applying sewage sludge.The content of available K did not increase considerably in the mellow soil but the available K in the immature soil in-creased significantly.The content of Cu and Zn increased with the increase of application quantity of sewage sludge and content in the immature increased more significantly than in the mellow soil,yet the level were all within the allowed limit of our country standard(GB 15618—1995)。