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Thread: Yellowing tips of the leaves, help

  1. #1

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    Default Yellowing tips of the leaves, help

    Hi,

    I’m growing Cream Caramel Auto in 2 gallon pots. It’s my second grow and I have the same issue as I did the last time - the tips of the leaves are yellowing. The plants are not showing any deficiencies or problems rather than yellowing at the tips on the new growth. The problem started at about day 30.

    My growing medium is Biobizz lighmix + perlite + mycorrhizal fungi supplement. I also have Biobizz nutrients but until this day I only fed once and probably gave them only 1/4 of the recommended dose (+ some CalMag) at day 35. Soil pH is at 6.8.

    My grow space is 2x1x2 ft (micro grow). I’m using 90w 2700K CFL + 76w 5500K CFL + 70w HPS. The distance from the bulbs is 6-8 inches.

    I’m pretty sure it’s not a nutrient burn. Might it be a light burn? I doubt that because of CFLs... Also some tops are not yellowing. There’s no difference between tops at different distances from the lights either...

    Zinc deficiency? They definitely got some zinc when I fed them.

    Could it be something else?

    P.S. Sorry for my English, it’s not my first language.
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  3. #2

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    Quote Originally Posted by KBRA7 View Post
    Hi,

    I’m growing Cream Caramel Auto in 2 gallon pots. It’s my second grow and I have the same issue as I did the last time - the tips of the leaves are yellowing. The plants are not showing any deficiencies or problems rather than yellowing at the tips on the new growth. The problem started at about day 30.

    My growing medium is Biobizz lighmix + perlite + mycorrhizal fungi supplement. I also have Biobizz nutrients but until this day I only fed once and probably gave them only 1/4 of the recommended dose (+ some CalMag) at day 35. Soil pH is at 6.8.

    My grow space is 2x1x2 ft (micro grow). I’m using 90w 2700K CFL + 76w 5500K CFL + 70w HPS. The distance from the bulbs is 6-8 inches.

    I’m pretty sure it’s not a nutrient burn. Might it be a light burn? I doubt that because of CFLs... Also some tops are not yellowing. There’s no difference between tops at different distances from the lights either...

    Zinc deficiency? They definitely got some zinc when I fed them.

    Could it be something else?

    P.S. Sorry for my English, it’s not my first language.
    Looks like its going into its crowning burst now mate ( ready for flowering) , looking good
    Food is depleting now in the soil, I'd just keep what your doing with the low doses of grow
    Atb matey
    Last edited by Greengrass; 17-04-19 at 07:57 AM.

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    Next time you add your feed introduce a very small amount of bloom food to it

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    I agree. Time to start feeding regularly. Small doses at first to see how she reacts.

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    Around now your autos going to want to stretch for a week or so, just my experience I find this is where they start looking hungry so it's tempting to go banging in the nutes thinking she'll go faster but in reality it's more likely stun them, I know because I do it every time 5th week start chucking in the bloom and pk then realise too much too soon and spend the next week trying to correct it
    Go easy with the biobizz mate less is definitely more with that range, good to have a water only day
    BTW that crowning they Allways show pale green until they open up
    Rant over
    Have to stop having a smoke this early on me day off
    Last edited by Greengrass; 17-04-19 at 11:38 AM.

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    Quote Originally Posted by Innerself View Post
    Have to stop having a smoke this early on me day off
    Tell me about it...one leads to another...spliffs & days off

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    Thanks for the input guys.
    However, the problem seems like it is spreading... I see yellowing at the tips on the lower leaves, also I can see some browning at the very tips of the leaves where the yellowing started. Something is not right... The common sense tells me it might be a nutrient burn but that does not make any sense because I only gave them so little like .5ml/l of both grow and bloom at day 35, around 400PPM in total. And the yellowing started even before their first feed. Could it be that mycorrhizal fungi is doing it's job too well and any ammount of additional nutrients is causing leaves to burn?

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    Quote Originally Posted by KBRA7 View Post
    Thanks for the input guys.
    However, the problem seems like it is spreading... I see yellowing at the tips on the lower leaves, also I can see some browning at the very tips of the leaves where the yellowing started. Something is not right... The common sense tells me it might be a nutrient burn but that does not make any sense because I only gave them so little like .5ml/l of both grow and bloom at day 35, around 400PPM in total. And the yellowing started even before their first feed. Could it be that mycorrhizal fungi is doing it's job too well and any ammount of additional nutrients is causing leaves to burn?
    Show a picture or two of the whole plant and someone has probably run into it and can point you forwards matey

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    Some photos.

    It really looks like a nutrient burn but the problem started even before the first feed and I'm also using lightmix...
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    More photos.
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    How are you watering on day....?
    Are you watering the pot fully until a trickle comes out of the bottom and do you treat the water other than with nutes?, I mean Do you ph adjust your water
    With out a picture of the whole plant still hard to say but those leaves do look dark and tips does say over feeding
    Google search your plant and take a butchers at what some other people's look like, not an exact science as plants are all different but you may get the jist of the shade your looking for
    Maybe just a week or more of just plain water is all it needs
    Like a said a picture of the whole plant from top to bottom will help
    Atb
    Last edited by Greengrass; 18-04-19 at 11:07 PM.

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    I am watering them every 2-3 days till I see about 20% of runoff and I always adjust the pH. I fed them only once at day 35, gave grow and bloom, both .5ml/l, which was about 400PPM at 6.8pH...

    Today is 14th day of flowering. I just gave them some plain water + CalMag 1ml/l at 6.3 pH @ 243-334 PPM (I have two TDS meters which both shows different numbers).

    The runoff was:
    1st plant) 6.8pH @ 360-486 PPM
    2nd plant) 6.5pH @ 298-393 PPM

    The plant with higher runoff PPM is also the one who is appearing more sick.

    If “med-man feeding chart” is correct I should blast them with 800 PPM at this stage of flowering so it’s definitely not overfeed what’s causing leaf tips to yellow and brown…

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    I'm wondering if it's mycorrhizal fungi what's causing that... I put a lot of it in my soil mix but on the package it said that you can not overdo it...

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