no, had her dialed in till now .. Usually don't have a need to check ph . School me .Have you checked media pH?
I mixed amendments .. Thinking maybe excess salt build up from N from last years grow . Thx for chiming in .. Maybe EJ Micro, cal mag , Epsom salts . Idk . Lol.lol I just read 100 gallons... thats a lil bit out of my league.... I use a pH wizard pH meter, and run 5 gallon smart pots, and usually i take 4 readings ( 2 on each side) and average them out..
when you say you re-amended do you mean top dressed and scratched in.. or actually mixed in the amendments before you put the plant in? cause if it was top dressed you could have a low pH on top and a relatively high pH in the root zone.. causing crazy swings... just my thoughts... no books to back it up
if you think its salt build up then perhaps she needs a good thorough watering to get rid of some of that?
Yes I sprayed with BT and safer recently .