施用污泥堆肥对作物和土壤的影响

污泥中的有机质、营养成分可为农业生产提供重要的有机肥源，但污泥中的重金属是制约污泥农用的重要因素，为检验污泥堆肥施用后对作物及土壤的影响，文章对污泥与稻草或木屑堆肥的产品进行了盆栽试验研究。结果表明，污泥与稻草或木屑的堆肥作为肥料施用于萝卜(Brassicacampestris)和菜心(Brassicaparachinensis),产量明显提高，部分堆肥产品增产效果优于化肥，且后效明显。堆肥施用使土壤中有机质、各养分含量增加，微生物活动增强、数量增加，然而作物和土壤中的重金属含量也有不同程度的提高。

EFFECT OF SLUDGE COMPOSTAPPLICATION ON CROP AND SOIL

The municipal sludge is a good organic fertilizer for crops and soils, but the effect of sludge composts on crops and soils in South China is still to verify. The compost of the sewage sludges from Guangzhou and Foshan with rice straw and wood chips was applied to turnip (Brassica campestris) and Chinese flowering cabbage (Brassica parachinensis). The crop yield, heavy metal contents and soil property change were determined. Results showed that the applications of the composts significantly increased the crop yield, and some composts were better than conventional chemical fertilizers. The residue effect of the composts was more obvious than conventional chemical fertilizers. The applications of the composts also significantly increased the soil organic matter,available nutrient contents and bacteria populations after the crops. But it increased also Cu and Zn contents in the crops and soil.