Farmers are bracing for effects of the Iran war on fertilizer prices and availability as the spring planting season nears. Farmers have complained about costly fertilizer for years, but prices have soared even higher since the U.S. and Israel attacked Iran on Feb. 28. The war prompted Iran to largely block shipping through the Strait of Hormuz, a chokepoint for 20% of the world’s oil and natural gas. Besides increasing the price of fuel, which is key in the production of fertilizer, the shipping disruption also has reduced the export of nitrogen fertilizers manufactured in the Persian Gulf and limited access to key fertilizer ingredients.