I really don't think it's a matter of "sucking" and more a matter of nazis destroying or damaging the vast majority of Soviet agricultural land
It's a miracle bustbowl conditions didn't emerge after the war due to the overcapacity that the non-occupied arable land was subjected to
Also agriculture in general sucked all over the world up to the 40s, 50s and early 60s, it wasn't until the early 70s that the silent Green Revolution revolutionized and TRULY industrialized agriculture in the breadbaskets of planet earth