On the one hand, I can't really comment specifically on the soil quality. I don't have first hand scientific knowledge.
On the other hand, it's certainly true that these producers are not implementing anything like a closed-loop nutrient plan. They're absolutely trucking in fertilizer from somewhere else to keep yields high. And they're producing monocultures, enforced with chemical pesticides and herbicides, to keep expenses low. Neither of those things strikes me as good in any possible way other than cost efficiency.
"Once plants and animals were raised together on the same farm — which therefore neither produced unmanageable surpluses of manure, to be wasted and to pollute the water supply, nor depended on such quantities of commercial fertilizer. The genius of America farm experts is very well demonstrated here: they can take a solution and divide it neatly into two problems."
Not to mention the law of unexpected consequences: with all the nitrogen fertilizer used on local farms and lawns in SW FL with subsequent run-off into streams and bayous due to the heavy rain every day during the summer, the 'red tide' plague shows no signs of abating.
On the other hand, it's certainly true that these producers are not implementing anything like a closed-loop nutrient plan. They're absolutely trucking in fertilizer from somewhere else to keep yields high. And they're producing monocultures, enforced with chemical pesticides and herbicides, to keep expenses low. Neither of those things strikes me as good in any possible way other than cost efficiency.