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Soil Survey links

The soil survey can tell you a lot about the soil on your garden-farm. In the US, most of the soils have been surveyed and there is detailed info about pH, sand fraction, clay fraction, CEC, carbonate content, organic matter content and more. These are a snapshot of what the soil was like when it was surveyed (maybe 40 years ago), not what it is like today. But it is a good starting point. Definitely worth looking into for your soil, especially in the US where you may simply click on a map to get the report.

Soil Carbon 

soil testing
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