need help fast ! black spots on new leaves after feeding !

Discussion in 'Growing Marijuana Indoors' started by batata, Jul 6, 2017.

  1. #1 batata, Jul 6, 2017
    Last edited: Jul 6, 2017
    high guys, shall i say down nowtime :notworthy:, first time grower, after feeding my gals yesterday i got the leaves curling down and these black spots appearing on the top leaves

    plants are 32days old, they've been showing pistils since 2-5 days, cfl lights 6500k 400w, proffesional soil, water ph 6.3 (after adding everything (tap water ph is 7.1), runaway ph 5.4, i gave 1/2 tsp /2L of microplex 15.2 (details of the fert in the pictures) + 1/2 tsp of bloom npk 12-12-24 + 1/2 tsp of pomegranate molasses, humidity right now is peeking at around 60%-85% these last days, temps around 75°-85°f, first strain is an amnesia xxl auto and second is a critical 2.0 auto, all under LST
    they've been doing great (first two pictures) till feeding [​IMG] it's for sure coming from the nutes

    [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG]
    i really feel like i screwed it up :sick: no chance that affected leaves recover right ?
  2. Could be phosphorus deficiency. If you think you fed right then it could be nutrient lockout from salt buildup, in which case you should flush with a lot of plain water, then give 1/2 strength nutes for first feed afterwards. Affected areas wont recover, theyll get crispy and withered.
    • Agree Agree x 1
  3. i gave them some phosphorous in the npk i think this can only be an excess
    making searches like crazy, i'm suspecting a manganese exess especially since it's in a high percentage in the nutes,moreover cause the PH is pretty low and that favorises the manganese absorbtion, anyone who dealed with it can confirm ?

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