[msrenee]

So there's like 4 or 5 different studies cited in that article. The one you're talking about, unless you found the rest of the article and it says something completely different, doesn't reach any conclusions about the cause. It just says that the researchers think the easiest explanation is different cultivars.

That probably has something to do with it. However, plants don't make nutrients out of thin air. They cited samples that found the nutrient content in the soil at "regenerative" farms was much higher than other organic farms. It seems crazy to me to think that soil quality wouldn't be one of the main causes, on top of all the practices to get higher yield out of a smaller area. Which was discussed in the article.