There is probably no way of knowing.
I do know that obtaining a "Certified Organic" stamp on a product label is a HUGE moneymaking scheme for the certifying agencies. I'm talking thousands of dollars each year cost, which - Will be added to the cost of the product.
If organic is cow dung fertilizer and non-organic is nitrogen based fertilizer with micro elements, then one needs to understand that the plant takes on nutrients at the molecular level and must break down the cow dung, compost, whatever into the same compounds as in the nitrogen based fertilizer before it can use it. I do know that chemical fertilizers are a very efficient way to deliver nutrients to a plant (think lower overall cost to a hungry world).
Pesticides are different. what I can tell you is that EPA evaluates all pesticides. We may not agree with EPA, but they are competent scientists, maybe more competent - maybe less competent than the "organic only - no pesticide" lobby.
At our house, we grow vegetables and try to not use pesticides in our garden. I can see no measurable difference in them from what I buy at the farmer's market, which may or may not be sprayed. I do see that most of teh time, I can buy them as cheap or cheaper at the grocery store, where Anti-pesticide folks tell me they are most likely loaded down with bug killers.
When all is said and done, you must die of something. It is too much of a strain on the coroner if they can't assign a cause of death on the certificate. As far as I am concerned, they can put, "Cooked Vegetables from Piggley Wiggley" on my cert.
This post was edited on 5/6 at 11:48 am