Anyone else having a problem with low pH in bottom half of container and a higher pH in top half of soil mix?
What type of pots and dimensions?
That will play a big roll as well as soil structure.
Things to consider:
-Use of ammonia/ammonium ferts can lower root zone ph.
-plant respiration can lower ph so aeration is important
-microbe respiration can lower ph so again aeration is important.
-nutrient build up can lower PH as the makeup is generally acidic.
-Aeration can be improved by better watering techniques, better selcetion of containers and media mixes