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2021考研英语备考：看阅读记单词(八)
Even plants can run a fever, especially when they’re under attack by insects or disease. But unlike humans, plants can have their temperature taken from 3,000 feet away- straight up. A decade ago, adapting the infraredscanningtechnology developed for military purposes and other satellites, physicist Stephen Paley came up witha quick way to take the temperature of crops to determinewhich ones are under stress. The goal was to let farmers preciselytargetpesticide spraying rather than rain poison on a whole field, which invariably includes plants that don’t have pest problems.
Even better, Paley’s Remote Scanning Services Company could detect crop problems before they became visible to the eye. Mounted on a plane flown at 3,000 feet at night, an infrared scanner measured the heat emitted by crops. The data were transformed into a color-coded may showing where plants were running “fevers”. Farmers could then spot-spray, using 50 to 70 percent less pesticide than they otherwise would.
The bad news is that Paley’s company closed down in 1984, after only three years. Farmers resisted the new technology and long-term backers were hard to find. But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to get back into operation. Agriculture exper...
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