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- fine-ass '22 harvest!
yes, larger necrotic patches are P defc., fine speckle spotting is Ca defc.,.... MC has a good amount in it, but under LED there seems to be elevated needs in general, plus plant-to-plant diff's in demands,...Arthur makes a good point about checking pH in-pot, which does need the right tool for the job! Run-off is not a good measure, only as a very crude measurement just to see if it way off which indicates a certain problem with pH in-pot.... That said, MC is weak in P, especially for bloom, and too much N in my opinion... Most devoted MC users end up also adding in a PK booster, preferably something with little to no N... Bud Explosion is their booster, but it's really K heavy, and again low in P as a ratio ( about 1:2, P:K)... better for finishing, not for early-mid bloom.... there are lots of choices for bloom boosters, just look around; mind the ones with huge numbers (like BE), and lower the dosing to 1/4 - 1/2 as a general rule...
pH check is to make sure it's not low enough to lock out P,... I don't think so from looking at the plant, and the flushing, but that's not solid.. Pro-Mix likes to be low 6's pH.... Did you test any run-off pH before?
