compost potatoes
Good for you! Without knowing what exactly you put into your compost heap on your potatoes (and we really don't need to know, thanks ;-)), it's hard to know if the pile created heat that made a difference. It may be the the composted ingredients were beneficial to the potatoes by simply adding nutrients; that's what compost does. If what you're doing works, keep it up! Remember to plant your potatoes in a different spot next year; crop rotation is key the success of just about any annual vegetable. Good luck with your spuds!