hyposomniac
Active member
The pH charts posted by DC have been the scientific model for many years. Used throughout the Ag community and and the USDA.
This link might help.
https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_053293.pdf
Thanks for the link, it's a nice chart and it references where it came from, and that manual may describe the process of determining their chart, which would be most interesting. I will look into it. It is also a soil chart..
Now I did not see a chart posted by DC, that you make reference too. I look forward to seeing that chart.
I want to make sure we're all looking at the same material.