YELLOWING ON LEAVES- HELP

Discussion in 'Newbie Central' started by thetexasgiant, Mar 8, 2018.

  1.  
    thetexasgiant

    thetexasgiant Member

    Day 22 of my grow and there are two leaves yellowing a bit.
    20180308_063635.jpg

    Anybody got any idea what it could be? I started feeding calmag on Monday. It's on a 18/6 light cycle under a 600w led about 20" away. Temps range from 75-85 and humidy from 40-60. Water in the morning and before bed.
     
  2.  
    Lordhooha

    Lordhooha Well-Known Member

    Considering you just started feeding cal mag watch the new growth. That’s old growth.
     
  3.  
    thetexasgiant

    thetexasgiant Member

    New growth's coming in good so far, and the one leaf w/ the most yellow is one of her first real leaves lol is it normal for old growth to do that? Thought about just clipping it off
     
  4.  
    Tim1987

    Tim1987 Well-Known Member

    Are you in soil or a peat/coir mix?
    I reckon it was the calmag and your ph is high.
    But do all the checks first.
    Tim
     
  5.  
    Lordhooha

    Lordhooha Well-Known Member

    It most likely was lacking just watch your new growth.
     
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  6.  
    xtsho

    xtsho Well-Known Member

    Why are you feeding calmag?
     
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  7.  
    Stblazed

    Stblazed Member

    It looks like nute burn, did you feed stronger nutes recently??
     
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  8.  
    Stink Bug

    Stink Bug Well-Known Member

    The first set of leaves often come into contact with the medium damaging the tips. I wouldnt worry much. And i am also curious as to why you started feeding calmag? The plant looks pretty healthy overall.
    And it looks like you are just watering directly around the plant. You need to water the entire pot.
     
    Last edited: Mar 8, 2018
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  9.  
    JSB99

    JSB99 Well-Known Member

    Even though there might need to be a small adjustment, leaves get yellow spots now and then, during it's life. Just like people get a random bump or scratch. Keep an eye on it to make sure it isn't anything that needs attention, but don't worry if you see a lone yellow spot here and there. Might just be nothing.

    Is that coco your growing in? If so, then you need to use CalMag. If it's soil, I wouldn't add any unless there's a specific problem where it's needed.
     
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  10.  
    Tim1987

    Tim1987 Well-Known Member

    Id have to disagree.
    I run straight coco. No lime, no calmag. Just a+b nutrients.
    Maybe once or twice i give it some if the ph is in range.
    Coco is a great buffer on its own.
    Its just gotta be flushed every feed / watering.
    Coco can barely hold on to calmag you give. Because coco is naturally high in calcium and mag..
    Give it calmag and it locks out.
     
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  11.  
    kingtitan

    kingtitan Well-Known Member

    I have done coco but all instructions always say to dose with CalMag for first 2 weeks to charge.
     
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  12.  
    Tim1987

    Tim1987 Well-Known Member

    I still dont need it.
    The a+b is fairly high in cal and mag. As high as the bottle of 2 .0. 0. Calmag.
    Id check it yourself.
    When youre feeding often, the coco catches the excess and buffers anyway.
     
  13.  
    JSB99

    JSB99 Well-Known Member

    I had to use it when I did coco, which was only once. Plants were showing deficiency until I added it. GH instructions say to give it at each feeding.
     
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  14.  
    Cx2H

    Cx2H Well-Known Member

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  15.  
    Tim1987

    Tim1987 Well-Known Member

    Exactly right. You should know when its def. or toxicity.
    If you dont correctly check, your symptoms wii look a lot worse either way.
    But its always better to just ad a little, or take away a little, than waaaaaay too much.
    Peace dude
     
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  16.  
    Tim1987

    Tim1987 Well-Known Member

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  17.  
    Cx2H

    Cx2H Well-Known Member

    I know exactly what's going on.
    You buffer with magnesium for CEC...

    Not lime to adjust pH or gypsum as a conditioner

    Coco has excessive K, and sodium right off the top, it binds magnesium to its fibers and doesn't release it..

    Thanks for coming out, God bless and good night.
     
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  18.  
    Tim1987

    Tim1987 Well-Known Member

    You need to flush. Calcium and mag are SALTS aswell.
    If you rinse and clean your coco properly, well its only what YOU are putting in.
     
  19.  
    Cx2H

    Cx2H Well-Known Member

    So basically you haven't researched CEC and Coco. Gotcha, Your single user case can't dispute peer research data but I digress with the other 90% of Coco users who aren't running dtw or multiple feedings a day. I didn't say calcium either.
     
    Last edited: Mar 8, 2018
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  20.  
    JSB99

    JSB99 Well-Known Member

    Agree. Common noob mistake.
     
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