EFFECT OF SLUDGE APPLICATION ON THE LOSS OF CADMIUM AND LEAD IN FARMLAND SOIL.

This study used pot experiment, replacing fertilizer with sludge, to explore the loss of heavy metals cadmium and lead in farmland soil with different fertilization modes. The results indicate that when simulate drought rainfall, avenge rainfall and abundant rainfall for irrigation, the maximum runoff is always the treatment with adding 40% sludge to the soil, increasing 5%-8% than blank control; the cadmium outflow rate of treatment with adding 40% sludge to the soil is 9%, 14.7%, 4.3%, which is al-ways lower than the blank control; the lead outflow rate of treatment with adding sludge to the soil is 0.034%-0.29% higher than the blank control. To prevent and control agricultural non-point source pollution from the source and protect the agricultural environment, this study recommends the use of a 40% sludge fertilization model in Cd-contaminated farm-land to achieve the purpose of minimizing the loss of heavy metals Cd in the soil, while Pb-contaminated farmland is not recommended using sludge as an organic fertilizer. [ABSTRACT FROM AUTHOR]

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