Price rises since the conflict began have been modest, driven mainly by higher oil prices and cushioned by ample global cereal supplies, FAO Chief Economist Maximo Torero said in a statement.
But if the conflict lasts over 40 days and input costs remain high, farmers may reduce inputs, plant less, or switch crops to less intensive fertiliser crops, he said.
"Those choices will hit future yields and shape our food supply and commodity prices for the rest of this year and all of the next," he added.
The FAO Food Price Index, which measures changes in a basket of globally traded food commodities, rose by 2.4% from its revised February level.
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