Major factors affecting the activity of heavy metals, and effects of nitrogenous fertilizers on the adsorption and desorption of heavy metals in soil for disposing sludge, as well as the chemical behaviours of heavy metals in rhizosphere soil and plant absorption were discussed. Several measures for agricultural practices to alleviate and lower the effect of nitrogenous fertilisers on activating heavy metals were emphasised. Sludge or activated sludge fertilisers should be applied rationally by following the prescription. Rational application of nitrogenous fertilisers would be encouraged, locally suitable ones should be chosen, and ameliorant could be made in use whilst applying fertilisers.
Shanghai Environmental Science
Soil Nitrogenous fertilizers Heavy metal Sludge