Canada’s fertilizer industry says U.S. President Donald Trump’s threat of “very severe” tariffs will “jeopardize” North American agricultural supply chains if they’re imposed, warning the U.S. doesn’t have enough potash reserves to replace Canadian imports.

Trump said Monday while announcing billions in government aid for American farmers hurting from higher prices — including on fertilizer — that he may tariff Canadian fertilizer “if we have to” in order to bolster domestic production.

In a statement, Fertilizer Canada said increasing fertilizer production “cannot happen overnight and can take 10 to 15 years to increase.”

“Imposing tariffs jeopardizes the deeply integrated, open trading relationship that is vital to North American agricultural producers,” the statement said.

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