And one more from Organic Bytes

Study-- Conventionally Grown Vegetables Have Significantly Lower Nutrient Value Than Organics:
The February issue of the Journal of HortScience reports the average vegetable found in today's supermarket is anywhere from 5% to 40% lower in minerals than those harvested just 50 years ago. As Davis points out, more than three billion people around the world suffer from malnourishment and yet, ironically, efforts to increase food production have actually produced food that is less nourishing. If you're still not buying the whole "organic-is-better" argument, this study might convince you otherwise...