Emilya Green
Well-Known Member
the pH of most nutes, solutions or powders, is acidic. It will always act as a pH down to your water, sometimes driving it too low, so that you need a pH up solution to get it back to 6.3 pH.
When you water to saturation with this 6.3 pH mix, you essentially create a column of pH adjusted water and soil in a suspension, and the pH of that column of water, nutes and soil has no choice... it has to be the pH of the water you just used to create it, simply because there is so much water in comparison to anything else there and it hasn't had a chance yet to interact with the buffers in the soil.
When you water to saturation with this 6.3 pH mix, you essentially create a column of pH adjusted water and soil in a suspension, and the pH of that column of water, nutes and soil has no choice... it has to be the pH of the water you just used to create it, simply because there is so much water in comparison to anything else there and it hasn't had a chance yet to interact with the buffers in the soil.