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Thread: Magnesium deficiency?

  1. #1

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    Default Magnesium deficiency?

    Hello guys,

    I have noticed that what I thought at the start to be a normal yellowing process of the older leaves might be a Mag deficiency. Here are some pictures of the leaf:

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    This is the only leaf in this condition, there are a couple of small leaves in the center with a green/yellow colour but no burn signs. Today most of the bottom leaves were dropping but I think it's because I watered a bit later then what I was supposed. If that is the case I should see an improvement in a short period of time and I will update. The over all leaves looks dark green and curling down, forming a claw. Plus, It does not seems to me that is growing as fast as before. It's been just 8/9 days in the flowering phase so I was expecting to see some growth still. I am still giving Bio Grow and plus Bio Bloom and Top Max in the amount suggested from BioBizz. Temp. between 25/29 degrees, Humd. 40/55%, Soil mix from Canna terra professional. It's at the end of the fifth week. The water I am using is from the tap, it should be soft from council analysis so I might need to implement some Cal-Mag. What do you think?

    Thanks for your help!
    Last edited by JAMEAT; 01-06-20 at 10:31 PM.

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  3. #2

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    Doesn’t look like mg def.

    Have you tested your run off Ph recently?

    If anything I’d say it looks more like Nitrogen def but it could be something else..

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  5. #3

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    After a second look I think it’s most likely to be over feeding causing a ph issue.

    I’d check your run off ph to get a better idea what’s going on.

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    Thank you for your opinion mate. I have checked the runoff ph and was 6.2 a week ago. I am going to check it again tomorrow. It might be overfed, considering that it is an auto maybe it's better if I go 1/2 dosage. I thought that a good soil should automatically balance the ph to the right level. If it is overfeeding then what's the next step? Should I flush, stop feeding, reduce the nutes or just remove BioGrow which has the highest nitrogen level and continuing with TopMax and BioBloom?

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  9. #5

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    Quick pics update.

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    It is dying quickly. Although this is the only leaf in this condition, there are some random leaves with no yellow colour but the burnt tip.

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  11. #6

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    In most cases the soil will buffer the ph within range but if there’s an excess of nutrients within the soil or you weren’t ph’ing the feed to 6.5 it will have a harder job keeping it in range.

    It doesn’t look too bad to me, so personally I would just water next time with ph’d water only. Maybe run some extra water through it to balance it back within range.

    Are you feeding with every watering?

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    Lowest big fan leaf gone a bit manky?

    Pinch it off and forget about it. Part of the lifecycle.
    I'd love to do it and you know you've always had it coming

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    Or you could flush through with quarter strength 3x pot size ph 6.5. Just to be safe.

    As your ph was slightly low before though I’d say it’s a slight low ph issue and overfed. A water only at ph 7 also should do the trick I’d say.

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    What's with all the flushing and pH? It's a very low, very old fan leaf that just needs to be removed for cosmetic reasons.

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    The plant is a tad overfed, I grant you, but no need to go overboard. Just feed it a bit less.

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  21. #11

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    Opinions though, innit? I would not say that a mag or nitrogen deficiency was at play here.

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  23. #12

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    Quote Originally Posted by Herbitual View Post
    What's with all the flushing and pH? It's a very low, very old fan leaf that just needs to be removed for cosmetic reasons.
    In your opinion yes. But in mines there’s no reason to be losing leafs at all at any stage before flushing. But that’s just my opinion.

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  25. #13

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    Overboard possibly yes but there’s no harm in doing so either. A simple water only feed ph’d a bit higher is what I’d recommend then just ease back on the nutes slightly.

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  27. #14

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    I do regulate ph at 6.2/6.3 when watering. Canna Terra seems to need a slightly lower PH than what is normal for soil. I do feed every watering which happens to be every 2/3 days. The products label says that is ok to do so but yeah... next watering It will be just water.

    It is true, it is an old leaf but many other have a burnt tip and I prefer to prevent bigger problems.

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    Quote Originally Posted by Nuggetz View Post
    In your opinion yes. But in mines there’s no reason to be losing leafs at all at any stage before flushing. But that’s just my opinion.
    TF? You never lose the oldest, lowest, biggest fan leaves before the plant is well into flower? Hat well and truly doffed.

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  31. #16

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    Quote Originally Posted by Herbitual View Post
    TF? You never lose the oldest, lowest, biggest fan leaves before the plant is well into flower? Hat well and truly doffed.
    No not saying I never lose them, I’m saying there’s no need to just lose them and be happy with it. First thing I’d want to know is why it was happening.

    Let me turn that question around and ask.. Is it impossible to get a plant to keep all it’s leafs until flushing?

    I’m not saying you won’t lose leafs I’m saying if you are losing them try to find out why. There’s no reason for the plant to use stored minerals if your providing them correctly through the roots.

    Yes it’s going to happen but if it is it’s not down to the plant being done with them in my opinion.

    But at the end of the day whatever works works and I certainly wouldn’t lose sleep over a few dead leafs that’s for sure.

    All the best fella

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  33. #17

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    Quote Originally Posted by JAMEAT View Post
    I do regulate ph at 6.2/6.3 when watering. Canna Terra seems to need a slightly lower PH than what is normal for soil. I do feed every watering which happens to be every 2/3 days. The products label says that is ok to do so but yeah... next watering It will be just water.

    It is true, it is an old leaf but many other have a burnt tip and I prefer to prevent bigger problems.
    Personally I’d break the feeds up once in a while and just feed water or a low level feed. That way you won’t have nutrients building up within the soil. That should prevent ph problems arising as well.

    All the best

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  35. #18

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    Thank you guys!

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  37. #19

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    JMO but it looks like a bit of Nitrogen toxicity to me. Foliage will turn dark green and leaves will claw down with too much Ng, if left leaves will start to die and fall off, Ng toxicity is mobile and will climb up the plant.
    So much to learn, so little time to learn it

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  39. #20

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    Over fed & possibly over watered
    "The purpose of our lives is to be happy."
    (Dalai Lama)

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