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In the months that followed Russia's Feb. 24 invasion of Ukraine, benchmark prices for key fertilisers like diammonium phosphate and urea rose to decade and record highs, respectively.

Diammonium phosphate, which Tunisia imports from Russia, was in short supply.

The country accounts for about a tenth of the world’s urea-based fertilizer exports and a third of exports of diammonium phosphate, another type of crop nutrient, according to the World Bank.

China, the world's top exporter of phosphate, temporarily halted urea and diammonium phosphate fertilizer exports this summer to feed domestic demand as energy costs and corn prices rose.

“We rely second on American diammonium phosphate.”