There is no safe level.'' Bill Liebhardt, chairman of the Sustainable Agriculture Department at the University of California-Davis, previously worked for fertilizer companies but says the industry is wrong to oppose regulation. So far, no study has documented harm to human or animal health in the United States from the recycling of hazardous materials into chemical fertilizers. In Japan, however, studies showed that subsistence rice farmers had been sickened by ingesting cadmium that had passed from fertilizers through the rice crop. Although the health effects are widely disputed, there is undisputed evidence the substances enter plant roots. This has the potential to move up the food chain.
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