Turnips, along with most other root vegetables, are fairly cheap and easy to dehydrate. This time of year, they are very easy to find and usually on sale.
Wash and peel your turnips
Slice into thin pieces, the easiest way to do this is to use a mandolin slicer.
You can then blanch them (I don’t blanch my turnips) and then place them on your trays.
I leave them on overnight at 125′ F to make turnip chips. You can eat these as is. They are great with dips as well. Or you can rehydrate them and use them as you would fresh turnips.