The impact of the added soil was greatest where top soil had been removed, but it still had a beneficial effect even in places where it was simply layered over the existing soil. (sciencemag.org)
Poisoning the soil and wasting the accumulation of top soil of many centuries for a few bucks more. (tamino.wordpress.com)
It was famous for, and still is, rich farmlands that boast as much as twenty - four feet of top soil in many areas. (wineindustryadvisor.com)