Long-Term Management of Sewage Sludge-Amended Soils

摘要: Two studies concerning the bioavailability of trace metals from soils receiving heavy applications sewage sludge have shown importance soil pH and organic matter status. Liming old farm reduced Cd concentrations in cabbage lettuce by an average 43%. Application to brought about a marked increase content. These subsequently declined during first three months; some cases eventually decreased below that control while contents showed more gradual decline over time but still remained much higher than those controls.