This will be old stuff to you, dear jaded and all-knowing reader, but here are two items new to me:
Falue red has a Wiki page. Tractor eggs, it seems, do not.
Falu red: here's how you paint your Swedish farmhouse. You get some tailings from Swedish copper mine. You mix with a bit of linseed oil, rye flour and water. You paint the farmhouse. Ten years latter you brush it down and put on another coat. Repeat every ten years for three centuries. You've got a nice-looking red farmhouse; I would say "wooden," but at this point I assume the copper oxide is standing up by itself.
Tractor eggs: you cut they hay, you sprinkle on some chemical. You bundle it up in, I don't know, I suppose polyeurethane. You make a lump about the size of a suburban compost turner. Tractor eggs. You leave them in repose in the field to be admired until needed. I suppose they can be deployed any place you have hay, but the term does seem to have peculiar frequency in Scandinavia. Cue up jokes about tractor chickens.