A Field Evidence of Cd, Zn and Cu Accumulation in Soil and Rice Grains after Long-Term (27 Years) Application of Swine and Green Manures in a Paddy Soil

Although inorganic and organic manures with high concentrations of heavy metals can lead to accumulation or contamination in soils, there are few reports on the effects long-term application swine green rice grains paddy soils. A field experiment, which was established 1990 soil Hangzhou, China, used investigate availability uptake by plant. The results showed that nitrogen, phosphorus potash (NPK) plus manure manure, only increased 202%, 146%, 100% for total Cd, 5.5%, 7.6%, 6.6% Cu grains, respectively compared control without fertilization. Total Zn grain significantly 13.9% treatment NPK manure. Zn, after is due combined EDTA extractable changes properties. Furthermore, highest bioconcentration factor Cd found while it observed treatment. Thus, may be concluded a potential risk metal