Many farmers still have really old diesel tractors around. These things run fully mechanical, sans the starter motor maybe. If there is one thing farmers are good at, it's in-field improvised repairs.

Refrigeration is mostly an issue with meat and milk, but eh, humans have managed to do fine for millennia without it.

Fertilizer however, oh boy, that will be a nightmare. We can get by now that we know about stuff like nitrogen fixers or the beneficial effects of livestock like chicken, but it requires a serious effort to rethink mindsets.