Chinese Crops: A Soiled Image? (Agriculture)
Taylor, David A., Environmental Health Perspectives
As China aims to boost its agricultural production, its farmers' own zeal may prove to be the biggest obstacle to increasing exports. In the industrialized south, particularly, where agrochemicals are more readily available, farmers use such great amounts that consumers are growing leery of health risks.
Between 1949 and 1995, Chinas application of inorganic fertilizers soared, finally slowing in recent years to rates comparable with its more industrialized neighbors. But researchers at The Hong Kong Polytechnic University say farmers in Guangdong province still apply an estimated 800 kg/ha, or five times the world average. In that region's Pearl River Delta, some experts suspect farm pesticide residue of a role in nearly extinguishing the local pink dolphins.
In the August 2002 issue of Environmental Pollution, researchers from Hong Kong Polytechnic and the Guangzhou Institute of Geochemistry report mean cadmium concentrations of 0.58 mg/kg in the soil of farms growing cash crops. Associated with pesticides and fertilizers, cadmium is a known human carcinogen, and chronic long-term ingestional exposure is associated with kidney damage and osteoporosis. Although scientists don't know how much food exposure those concentrations translate into, the paper notes that continuous heavy application of agrochemicals and other soil amendments could exacerbate the accumulation of heavy metals in agricultural soils over time, as well as increase the amount that runs off the soil. Another report, in the 25 October 2001 issue of the Far Eastern Economic Review, states that China is the only country seeking a waiver to use DDT "as a general intermediate" and not just in the low concentrations used for malaria prevention. …