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As a complete outsider, I found this fascinating series of talks a few years ago that go into great detail on soil for farmers: https://youtu.be/uUmIdq0D6-A

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Cornell University has an excellent soil science course online: https://www.youtube.com/playlist?list=PLs7Y2nGwfz4HPoRAaB64c...

I watched these a few years back and agree they're a really interesting set of talks.

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