By Paul Wiseman A Minnesota farmer worries about the price of fertilizer. A San Diego entrepreneur deals with an unexpected cost increase of remodeling a restaurant. A Midwestern sheet metal fabricator bemoans the prospect of higher aluminum prices. Businesses knew that Trump’s import taxes — tariffs — on America’s biggest trading partners were scheduled to take effect Tuesday. But many of them assumed they’d get a reprieve. After all, the unpredictable president had delayed the tariffs on Canada and Mexico for 30 days right before they were originally supposed to kick in on Feb. 4. No such luck this time. At midnight Tuesday, the United States imposed 25% tariffs on goods from Canada and Mexico, starting a trade war with its closest neighbors and allies. Trump also doubled his 10%…