[Mean Daddy]

The crop rotation was government enforced. Soy beans do add nitrogen to the ground but when you switch to corn you still have to add anhydrous. My SIL family are big corn farmers and for them, it’s more efficient to farm one crop vs. two. More equipment, storage etc.

[PeterPrinciple]

Soy beans do add nitrogen to the ground but when you switch to corn you still have to add anhydrous.

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They can and used to. I can remember adding the bacteria as a kid. Now they use the carry over N as it is more efficient. That is why we get better yields now.

Don’t see the bright red nodules anymore when you pull up a root.

https://extension.okstate.edu/fact-sheets/understanding-soybean-nodulation-and-inoculation.html