"I have come across a dozen studies that shows that you get more phytonutrients and more minerals and vitamins from organic, but there are also studies that show that plants raised conventionally have more phytonutrients. And they trace it to the amount of nitrogen in the fertilizer used on conventional farms. The gold standard is choosing the most nutritious varieties and raising them organically, and that's what I recommend."
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Source : "Cook Your Berries. Drink Dark-Roast Coffee Instead of Light. Let Your Garlic Sit". Interview With Tom Philpott, www.motherjones.com. July 20, 2013.