Nitrogen fertilizer is made from natural gas, so maybe the nitrogen fertilizer plants in the EU were shut down to ensure adequate supplies for the EU's more inelastic demands for natural gas.

(More precisely, the natural gas is a cheap source of hydrogen atoms that get combined with nitrogen in the air to produce the fertilizer.)

There is no maybe, several fertilizer plants in the EU did shut down due to gas costs. And both Russia and Belarus are very important agriculture input exporters.