Data for SOM (Soil organic matter)

Hello, I am a high school student in California doing a science fair project about using a machine learning algorithm to model SOM based on other factors in the soil, such as its treatment, pH, nitrogen levels, atmospheric c02 etc.

Does anyone know where I can potentially find a dataset with SOM and other factors?

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Any chance from this collection of data sets? One refers to soil moisture, and several links go to some more specialized sets.

I am trying to find a link to something more directly useful, but cannot dig it out yet. I think it was available through the University of Michigan.

Unfortunately none of those work, the the soil moisture one doesn’t include SOM and the other two aren’t for soil