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Where is the science behind this pH business? I’ve looked lots of places to see where this first was founded. Not much luck with overall nutrient uptake. Individually there are some research done. Like phosphorus uptake at 5.5 was better than 4.5, 5, 6, 6.5 but almost insignificantly so, except for the pH’d solution at 6.5 which was lower. Interesting as plant sap is usually in the 6.5 range, but this is inside the plant. I realize phosphorus is a tricky element as it binds with calcium in higher pH and necessary trace metals at lower pH. I guess I’m not taking into consideration the cec aec ratios of different substrates. Water being an equal ratio?  Able to hold either with equal negative and positive charges? Also you’ll look at different pH solubility charts and they tend to differ greatly or slightly in some areas. Just curious who made or researched the first pH chart. Also how different substrates effect the pH solubility chart. We know microbes play their part and regulate the soil, possibly more than the plants themselves.