Don't guess! You can have (as charts show) high pH and low alkalinity. See diurnal pH swings. Check the pH in am and afternoon and see what they are. The way to fix that is with ag lime to increase buffering and in so doing reduce high and low pH readings. If you have a constant 8.4 pH or higher then repost results and you may have too (but I doubt) use gypsum given your location. Last time I checked gypsum was much more expensive than ag lime. Use the right one based on results.

Last edited by ewest; 04/17/23 04:09 PM.