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@Arsenal ... that issue with MP must be a weird coincidence....it's just specialized microbes, no P in there,.. are you using other inoculants with GBD mix? ... some strains/plants can get a little burn around half way through,.. my Biotabs did on my ohoto's, KindShite did too; tip roasting, particularly on the new growth, but a lot of leaves older and new showed it,... I think there's a rapid breakdown and rush release of nutes sometimes, and I bet it's related to the soil herd tearing it up in there... not long after, I started getting some fast fading leaves, so the Tabs at least spike up and fizzed out! I ended up using supp' nutes, PK boosters, even a little grow nutes when N defc. started.... I also use Earth Juice Microblast weekly as well, all micronutes and nuthin' else, a great formulation,.. mostly SO4 based, so extra S is going in too! Most of the micro's are immobile type elements, and as ions, they're very reactive unless well chelated,.. easily locked out by chemical interactions, and high pH,... So keeping a constant low level supply available for uptake is wise IMO,.... Oh, and Si,
always,.. same deal, constant low levels work best, but for different reasons,...SI is taken right up and used immediately, mostly going into cell wall tissues