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Colorado River DroughtIn this Thursday, July 11, 2019, photograph, Huihui Zhang at a research farm northeast of Greeley, Colo. Researchers are using drones carrying imaging cameras over the fields in conjunction with stationary sensors connected to the internet to chart the growth of crops in an effort to integrate new technology into the age-old skill of farming. (AP Photo/David Zalubowski)

GREELEY, Colo. (AP) — A drone soared over a blazing hot cornfield in northeastern Colorado on a recent morning, snapping images with an infrared camera to help researchers decide how much water they would give the crops the next day.

After a brief, snaking flight above the field, the drone landed and the researchers removed a handful of memory cards. Back at

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