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Plant problem? Brown spots on one leaf(pics)

Discussion in 'Marijuana Plant Problems' started by KiefCommander, Nov 26, 2017.

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    KiefCommander

    KiefCommander Member

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    andy s

    andy s Well-Known Member

    idk how many ml are in a tsp lol i havent done tht i use a med cup and fill it to the 10 mark. and as far as cloning or being too soon to clone, you can clone whenever you want as long as its gonna be big enough to use as a cutting.
     
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    zac graves

    zac graves Member

    I'm kinda getting the tiny brown/ yellow spots you had. Did that go away once you added cal mag?
     
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    Blitz35

    Blitz35 Active Member

    Yes, it was in my post, never edited or deleted. I just went by the images and descriptions I saw of the product..and it does not show any calcium or sulphur in it, and the magnesium is very low at 0.05%. http://www.greenhousemegastore.com/product/jack-foots-fertilizer-20-20-20/water-soluble-fertilizers
     
    andy s likes this.
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    andy s

    andy s Well-Known Member

    i couldve swore i seen calcium, i always add calmag anyways but never noticed. it has everything but that i guess lol but .05 is really all you need in my opinion. its not used by the plant as much during the whole cycle or a main in half of it.
     
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    Blitz35

    Blitz35 Active Member

    Magnesium is extremely important, and most marijuana strains guzzle magnesium. Without it, or lack of it, you will have many other problems! The plants use magnesium throughout veg..that's why your leaves are green on a plant, it's the only metal present in chlorophyll;) They use even more during flowering! You haven't noticed the lack of it, because you use cal-mag. A standard gh floragro, which still needs a magnesium supplement, has 1.5% magnesium in it....30 times more than jack's, and it's still not enough most of the time.
     
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    andy s

    andy s Well-Known Member

    ive done grows with jacks and didnt use calmag, the couple i did i didnt see any signs of a cal or mag def, i added dolomite lime in my pots at the beginning of the grow though so thats probably why i didnt get a cal def. . as ive changed things up over the years i added it bc one of my strains loved it. idk if its what makes the leaf green or not bc alot of other things can do that too like your b2 and N, lacking in cal alone can make leafs yellow or have spots so i wouldt say its all the mag doing it.very rarely people get an actual mag def so thats why i stated its not used as much as the others. could be strain dependent or could be marijuana in general i have yet to do my research on mag bc ive never saw it as a staple in their diets but one thats used a little throughout the grow. the things in flower i think they require are cal in the first few weeks, potash in the beginning stages of flower, and phos finishing out the rest of the grow. none of my flowering nutes have mag in them, none ever did. its something that needs to be built up during the grow like cal.
     
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    Blitz35

    Blitz35 Active Member

    Calcium does not contribute to chlorophyll at all...the only elements in chlorophyll, are hydrogen, oxygen, carbon ,nitrogen and magnesium..magnesium being the only metal present and the equivalent of iron in our hemoglobin. Perhaps the dolomite was enough for your plants, or your medium contained enough organic matter..but i have never heard of flowering without providing magnesium, especially to cannabis! Magnesium is the heart of the cholorophyll molecule...nothing happens without it! Phosphorus is used just as much as magnesium is overall..phosphorus is used mostly in rooting and start of flowering as an energy source, but mg is used throughout in the same amount as phosphorus is. Also, if you're lacking in it, the plant will take up potassium instead, and leave phosphorus sitting in the medium, ultimately locking out everything. Magnesium doesn't get built up over the grow, it leeches almost as easily as nitrogen does with waterings..it must be provided throughout.
     

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