Maybe I misunderstand your point, but I think you’ll find that 6 inches of top soil would weigh, on average, about 2,000,000 pounds per acre. To increase its weight by 5% would require in excess of 100,000 pounds per acre.
I think he meant to say tone and not pounds. His point, I think, was that you’re not going to increase the amount of aluminum in the soil by even a measurable amount dropping it from the air. Did you have a different understanding?