raised beds?

I'm thinking of building some raised beds around my existing hop mounds and filling them with vermiculite and compost for rhyzome production. I am planning on using some tree's that I just pushed up into windrows. when I say raised beds I mean 200 feet long by 7 feet wide, with partitions to seperate the hop varieties.
how deep should i make my beds, and is compost going to burn up my hops?
Is building raised beds going to make it any easier to propogate rhyzomes or am I better off just leaving them the way they are. I'm planning on cutting some roots this spring and starting another crop.

Lots of people use raised beds around here, 6-8" deep. You should compost the manure first or put it on in the Fall.

As far as harvesting rhizomes, loose soil is good.

Mix a good deal if sand 15% ish into your beds too along with that composted manure and vermiculite. It'll help drainage and keep the soil loose to help with the rhizome growth. I mixed lava rock in as well, this is said to help keep air in the soil and help the growth of beneficial bacteria. probably not more than 2 - 5% of the total garden mix