I am about to grow my first potatoes due to being in isolation .I have my huge bag half filled with a mixture of top soil and compost with stones at the bottom for drainage .I have bags of mature chicken manure and some duke of york seed potatoes .Where I am stuck is that I have no idea how much Chicken manure to use and if I place some under each seed potato .I know I plant then eight inches under the soil .Its just how much manure to use and where to place it thats getting me .All help appreciated and hope you all get through these tough times .Thanks a lot