Disruptions in the Strait of Hormuz and rising oil prices are putting global food supplies at risk, a series of reports say.

The main culprit is fertilizer, which has become scarce, especially in the developing world.  

Australian wheat farmers are planting less, China has placed restrictions on fertilizer exports, and dozens U.S. farming organizations sent a joint letter to President Donald Trump and leaders of Congress begging for relief.

The Rome-based United Nations Food and Agriculture Organization, which tracks food commodity prices, is set to release its report for food prices in March next week, but early indications are that it will likely see the largest spike since the start of the Russia-Ukraine war four years ago.