Workers unload urea fertilizer from a cargo ship in Yantai Port, Shandong Province, China on March 13, 2026.Cfoto | Future Publishing | Getty ImagesFarmers in the northern hemisphere are heading into the crucial spring months, during which major fieldwork must begin. Their peers in the south, meanwhile, are busy harvesting crops before the winter sets in. However, their work now takes place as the Iran war creates serious supply constraints for essential fertilizer products — fueling massive price spikes an ...