[PeterPrinciple]

This has been reported in the past. What the article doesn’t say is that the small deficit in nitrogen is more than made up for in increased volume.

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Agreed. the old Rule of Thumb corn was 3.5% protein. but yields have doubled and tripled. lot less now.

[protoconservative]

Because modern corn is to make carbs and starch, to feed pigs and cattle to make protein.

If you want carbs eat corn, if you want protein eat a pig.

Simple evolved eating...don’t listen to the people who brought you the food pyramid, they faked that science for simplicity.

https://u.osu.edu/sheep/2018/01/16/what-accounts-for-variability-in-grain-protein-levels-in-corn/

[alloysteel]

The doubling and tripling of corn yields has much more to do with the hybrid genetically modified strains of maize cultivars than it has to do with carbon dioxide. The plant will continue to synthesize carbohydrates (sugars, starches and the cellulose structures that make up the roots, stalks and leaves), but in a different ratio than the old open-pollinated varieties, which makes for a kernel that may have lower proportion of protein content, but a larger proportion of sugars and starches.