well, if you get good quality veggies, they will take away a lot of
nutrients. No till eliminates tilling, weeding, and reduces fertilizing
and watering, but you can not grow great chard with leaves compost only
(though you can with manure).
You do need either manure or some chemical fertilizer, at least with
some veggies. Or you need to grow a lot of peas and beans.
Also, no till eventually becomes very friendly to slugs. Now organic
slug bait is available everywhere, so this is no longer a problem.