VOA慢速英语 家庭园艺: 怎样处理土壤中的铅
Home Gardening: What to Do About Lead
家庭园艺:怎样处理土壤中的铅
This is the VOA Special English Agriculture Report.
Soil naturally contains harmless amounts of lead, along with other metals. Because of pollution, however, the amounts are higher the closer you get to cities and towns. But experts say this should not stop gardeners from growing food if they take safety measures.
David Johnson is a chemistry professor in the State University of New York's College of Environmental Science and Forestry. He explains that lead can enter the ground from leaded paint and leaded fuel and from industry.
And once lead gets into the soil, it stays a long time. It remains an environmental threat especially to children. Lead can harm mental and physical development even in babies before they are born.
If a test finds that soil has too much lead, you might be advised to remove the soil or cover it with sod grass. Different countries have different levels that they consider acceptable.
Carl Rosen of the University of Minnesota Extension notes that concerns about lead have increased now that more people are planting gardens. But Professor Rosen says plants generally do not absorb much lead. He says there is likely more risk from lead dust on plants or from playing in the soil than from the plant itself.
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