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並前往https://www.smithsonianmag.com/science-nature/scientists-say-nations-corn-belt-has-lost-third-its-topsoil-180977485/

The Nation's Corn Belt Has Lost a Third of Its Topsoil | Science

Crops hunger for the carbon-packed composition of rich topsoil. They need the nutrients and water that it stores, unlike the compacted, ...

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