Another thing to remember is that farming goes through cycles of intense activity followed up by periods of less activity. Unlike Australia European farming is more controlled by the seasons. Add in a nuclear winter and farm animals that were not kept in barns may not survive the winter. Barning requires not just a barn but enough feed - hay and grain - to keep the animals alive.
Cropping requires intensive effort when you sow and when you harvest. Crops in the field, unlike animals, are actually hard to steal so mauraders will wait until after the harvest to attack. Burning crops in the fields can destroy a settlement as you just lost your seed grain for next year and have nothing to eat.
I run a 42 hectre farm by myself thanks to oil and machinery. It is the vegetable garden and orchard to take up the most time as - unlike the cattle who look after themselves a lot of the time - you need to constantly work a vegetable patch to keep a constant flow of vegies. Again things will be seasonal and a European winter will be hard unless you have a greenhouse. Orchards are busy first at pruning time then thinning out the fruit and then picking the fruit.
Also preserving enough food to survive the winter will be the number one concern of a TW2000 Poland. One advantage Poland does have is salt mines so again they may be better off than large parts of Western Europe on that front.
Chickens and pigs will be common as they'll eat trash and leftovers and can be kept in small spaces.
All of the above is likely to be needed by any settlement or canton in TW2000 to provide a diet with enough calories and vitamins.
Also losing oil means losing argicultural chemicals and in particular fertilizers. While you can use manuring and rotation productivity will be way below modern standards. The UK realised that its whole civil defense strategy in the face of a nuclear war was useless as lacking oil for fuel and fertilizer agricultural productivity would fall to pre-industrial levels and hence could only support a pre-industrial sized population, so letting people die in the attacks was better than having them starve in the aftermath.