Not just fertilizer but politics. In my Canadian province there was a bumper crop of potatoes in 2021 but one field had one section with a potato virus. Shipmen

Not just fertilizer but politics. In my Canadian province there was a bumper crop of potatoes in 2021 but one field had one section with a potato virus. Shipments stopped and it took months of deals to get back to selling them. Even Puerto Rico with no potato fields and willing to take shipments was not allowed to receive any. Millions of pounds of perfectly good potatoes had to be destroyed. The US FDA declared the potato virus a threat to human health but no other country made that determination. Politics ruined a lot of food.