Rodale compares their own experimental farm, not organic yields on real commercial organic farms (many of which are run for more than 5 years). Their conventional yield is also on their farm, not real conventional farms.
Edit: Looking a bit further rodale has rest years that they don’t count for their organic fields. 25% of the years they literally don’t grow anything on a given plot, but they only compare the growth years.
Edit: Looking a bit further rodale has rest years that they don’t count for their organic fields. 25% of the years they literally don’t grow anything on a given plot, but they only compare the growth years.