U.S. President Donald Trump’s threats to tariff Canadian fertilizer imports could damage Saskatchewan’s potash industry if demand for the mineral critical in making fertilizer drops off, according to a University of Saskatchewan professor.

“It would likely cause layoffs at the mines and there would simply be a glut supply of potash in Saskatchewan, which would cause companies to scale back their production capabilities,” said Stuart Smyth, a professor in agricultural and resource economics at the U of S.

“The Saskatchewan potash companies will be very concerned about this.”

Trump threatened to tariff Canadian fertilizer imports to the United States during a White House meeting Monday when asked how he planned to increase domestic fertilizer production.

“A lot of it does come in from Ca

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