lp = peripheral.wrap("back")
list = lp.getAvailableItems()

while true do
    print("Sprawdzam kompost")
    for number, item in pairs(list) do
      if item.fingerprint.id == "Forestry:fertilizerCompound" then
        print("- w zasobach = "..item.size)
      end
    end
    sleep(120)
end