This is a side issue in the paper linked. The paper itself cites a more useful-seeming source: "Declining Fruit and Vegetable Nutrient Composition: What Is the

This is a side issue in the paper linked. The paper itself cites a more useful-seeming source: "Declining Fruit and Vegetable Nutrient Composition: What Is the Evidence?" https://journals.ashs.org/hortsci/view/journals/hortsci/44/1/article-p15.xml https://journals.ashs.org/hortsci/view/journals/hortsci/44/1... Freely available too, nice one.