Hi monsoon,
The way I understand virgin soil is still a land not planted yet to any crops (e.g. forest land or second growth forest). I don't know if this is the one you're talking about.
However, to clear your mind, let me suggest this way: If one of your soil is still virgin land, then you don't need any soil amendments. Virgin soils are very rich in organic matter sufficient enough to supply food nutrients to your crops.
But, if what you mean virgin soil as depleted soils, then you need to amend your soil by putting some additional compost to enrich the soil. Or if you've available grass clippings, waste garbage, or kitchen waste, you should put up your compost bin to have an available ready made compost for the succeeding cropping season.
Happy gardening!
Cris
www.crisramasasa.com