"Corn grain analyses for protein, oil and starch exhibited significant differences only for protein content, with the conventional corn having a higher content. Greater concentrations could have been due to the relative deficiency of nitrogen in the organic plots....Soybean grain analysis demonstrated no significant differences between conventional and organic systems, with average protein approximately 39%...."
Protein is a key nutrient in food; non-organic corn has more than organic corn.
No reliable studies have been done on other nutrients in organic food versus non-organic. You can look at every container in the super market on this issue and you will find no difference.