Natural cadmium loading and balance in a non-polluted rice paddy field in Japan
National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Tsukuba, Japan.Water Science & Technology (Impact Factor: 1.11). 02/2008; 58(11):2243-9. DOI: 10.2166/wst.2008.571
We determined the natural Cd balance in a cultivated rice paddy field in Japan. The main sources of Cd in the non-polluted paddy field were phosphorus fertilizer and precipitation (annual input of Cd, 2,000 mg ha(-1) and 1,020 mg ha(-1), respectively). These sources account for 95% of the total input of Cd (3,192 mg ha(-1)). The actual increase of Cd in the soil was 0.0016 mg kg(-1), we thus consider Cd in soil increases only slightly as a result of rice culture. This study indicates that it is difficult to reduce Cd loading by irrigation water treatment in a non-polluted paddy field. This further indicates that once a field is polluted by Cd it is difficult to decrease the accumulated Cd by the ordinary cultivation of rice plants.
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