agreed.......some P lock-out from overabundance of something else. I'm high, and can't remember all the P antagonists. fancy soil, fancy problems..........who said that??
1/3 peat, 1/3 well-rotted manure, 1/3 perlite.........some minerals, some mycos. that's it.
do not feed until pistils show, with a high P fertilizer..........maybe twice.......no more. only water when pots are really light to lift. use one size larger pot than you think you need, and fill it to within one inch of rim; it will settle. keep plants trembling in a light breeze. never a problem again. I call it the.........Don't Spend A Lot, Never Have A Problem, Yields As Good As Anyone's, Dank As A Paris Hooker In A Rain Coat Method. I know I risk heresy charges, but that's my opinion. the plants I grow in old bug shit.........yield as well as, and taste as good as the plants grown in fancy, expensive mediums, with even fancier, more expensive nutes. prepare the stake to burn me at........I won't resist.....lol.