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段落1

This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?

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Lawn enthusiasts love a lush, green carpet of grass.

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Which is why they hate crabgrass.

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And now, they may have one more reason to despise the weed.

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Because crabgrass isn't just faster-growing than the rest of the lawn.

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It may actually be poisoning the lawn, by pumping herbicide into the soil.

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That's according to a study in the Journal of Agricultural and Food Chemistry.

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Researchers crabgrass hydroponically, so they could easily capture any chemicals released by the plant's roots.

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Then they dripped that hydroponic solution into pots of wheat, corn and soybean seedlings.

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Two weeks later, they dried and weighed the seedlings.

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And sure enough, the crabgrass solution had significantly stunted the seedlings' growth, compared to control plants.

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And since corn is in the same family as lawn grasses, the crabgrass toxic effect may also spell bad news for your beautiful Kentucky bluegrass.

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The researchers still aren't exactly sure how crabgrass' chemical weapons work.

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But the weed can wipe out beneficial bacteria and fungi in the soil, too.

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So it's possible that crabgrass poisons its neighbors directly, by releasing toxins, and indirectly, by creating inhospitable soil.

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Either way, it's bound to make lawn owners crabby.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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