And they did have tractors. Plowing with a horse was a curiosity even in the eighties.
(not that there is anything wrong with it)
No, not everybody had a tractor - that would be ineffective, given how many small family-owned farms there were. But they did use tractors and combine harvesters. TBH I don't know whether they were shared between neighbors or just unofficially borrowed(#) for a bottle of vodka from the state farms (PGR).
(#)There's this Polish verb "załatwić" which I cannot properly translate to English. It means obtaining products or services using ones connections, cunning and possibly transfer of a usual token of appreciation as in "załatwić za flachę" (obtain something in exchange for a bottle of vodka).
EDIT: Then again, maybe not. When I hear people in Poland use that word, I'd maybe translate it as "organise" or "arrange", but only in the sense of arranging the acquirement of something.
Overall the gap was more along the lines of big cities vs. province as you say; rather than geographical. In a centrally planned economy large urban centers were overprivileged in the pecking order.
I remember the outrage over Microsoft Encarta which used photos similar to the Barbey's ones to illustrate the "Poland" entry in 2003 :)
See http://of19.internetdsl.pl/bzdury/encarta/
Two can play that game, http://www.landoverbaptist.net/wordpress/wp-content/uploads/... - life of an American citizen, 2016.
And two did play it indeed :) Communist propaganda would actually pull a similar trick on the West, focusing the coverage on the stuff that was, well; weird or creepy at best.
For example the "This is America" documentaries (by Romano Vanderbes) were broadcasted on the communist TV in 70s/80s in prime time. An average viewer would assume it to be an accurate representation of the prevalent lifestyle.
Harvesters and tractors were often rented for specific tasks.