I've grown potatoes from kitchen scrap right in the compost bin. A bed of clean straw works well also. If you know a cattle farmer, you might persuade them to give you a load of "punk" - the rotting hay from round bales that the cattle won't eat. Cover your seed potatoes with that. Weeds are easily plucked from it has are the tubers when they mature. Potatoes love loose ground. Compacted earth stuns the growth.