So I just did the slurry test after calibrating my pen. pH is 5.5 which could explain why she's not taking up nutes the way she should. At what pH should I water next to balance it ?
Agree soil probe meters are useless. Best way to correct this imo is to water in Dolomite lime at the ratio of one level tablespoon per gallon of soil, but recommend using only half this amount initially and then adding as needed to bring soil pH above 6.0;
6.5 is ideal, but if you add too much at once and it goes above 7.00 you'll never get it back down, so start slow
Also with soil PH that low the PPM May well be high too, recommend a heavy flush
A cheap PPM meter is the most used tool in my garden, recommend one strongly