I know for fact there is already Biome Mods adding such Soils and that GT6 supports those soils. 
It should be listed on the Compatible Mods Page, I think it was Biomes o Plenty.
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I know for fact there is already Biome Mods adding such Soils and that GT6 supports those soils.
It should be listed on the Compatible Mods Page, I think it was Biomes o Plenty.