"With modern farming methods the topsoil is not depleted."
Not at all? That's amazing to me. What about crop rotation? Have you gotten around that too, so that you can grow the same thing year after year in the same plot?
With no till farming topsoil loss is minimal to zero.Topsoil is created on most soils at a rate of 1 to 2 tons per acre per year.And yes crop rotation is the way to go and is possible with no till.