城市污泥的水稻肥用效果及环境影响的研究

Study on the Nutritional Effect and Environmental Impact of Sludge on Rice Field

用盆栽试验研究城市污泥直接肥用对水稻生长及其产量的影响 ,并测定了污泥中重金属在稻米和土壤中的残留量。结果表明 :污泥作水稻基肥施用有明显的增产作用和一定改土效果 ,但污泥带入农田的重金属大部分残留在土壤中 ,少部分被作物携带走 ,而在稻米中的残留量符合国家标准。

By conducting pot experiment, the effect of directly applying sludge on the growth and yield of rice was explored and the residue amount of heavy metals in rice grain derived from applied sludge was measured.The observations indicted that:the basal applying sludge in rice field could obviously increase rice yield and showed a certain improvement effect on soil fertility.Most of heavy metals of sludge remained in soil and only a small portion of heavy metals have been removed by rice plants. Then,the residue level in rice could be lower than the state accepted standard values of heavy metal residue.