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Thread: Apparent Ca- or nute lockout

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    New Member PotheadPanda's Avatar
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    Apparent Ca- or nute lockout

    Hi guys

    First time grower and poster here.

    I'm running two Blue Widow DWCs and am currently around week 7 of flower. About a week ago one of my ladies started showing rusty spots along the edges of the uppermost leaves, which I suspected was a Ca-. I started feeding EHG Micro which contains trace elements which were missing from the Bloom blend i was using, but it seems my TDS and pH remain unchanged even though the water level is dropping. Buds are growing very slowly, not fattening up and the spotting on the leaves is getting worse. I suspect nutrient lockout.

    I am currently flushing them with plain pH'd water (pH=5.7) and was thinking after two or three days I'll start them on a mild nute feed again.

    I realize they're pretty late into the flowering stage but I was hoping to just let them keep going so they fatten up a bit more.

    Any advice on what's going on and what I should do would be appreciated as I'd hate to lose this grow after all this time and effort!

    Parameters:
    24"x24"x48" grow tent
    300W LED infra full spectrum at 12/12
    2x5l bubble buckets
    pH=5.7
    TDS=500PPM
    Water temp=17 degrees Celsius
    Ambient temp=20 degrees Celsius
    Humidity=70%
    Currently at week 7 of flower but due to earlier nute burn during veg and other issues I feel that they're a little bit delayed.




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    New Member PotheadPanda's Avatar
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    Re: Apparent Ca- or nute lockout



    Another pic showing the progression. Help please!!

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    Re: Apparent Ca- or nute lockout

    Hey Panda, First off I am a total beginner, this being my first season. But the pH seems to be the biggest red flag to me. Looking at this chart it looks like the plants are missing a ton of good stuff. I had a similar problem last month and corrected pH to 6.5 and fed with Advanced Nutrients Cal-Mag to replace the missing nutrients. http://www.growweedeasy.com/sites/gr...-marijuana.jpg

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    420 Member Scientific's Avatar
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    Re: Apparent Ca- or nute lockout

    Looks like a calcium deficiency to me.
    How many PPM is your source water? (I'm wondering if it is hard and so has some mineral content.)
    Adding a Ca/Mg supplement like GH CALiMAGic should help, I think...

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    New Member PotheadPanda's Avatar
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    Re: Apparent Ca- or nute lockout

    Quote Originally Posted by Scientific View Post
    Looks like a calcium deficiency to me.
    How many PPM is your source water? (I'm wondering if it is hard and so has some mineral content.)
    Adding a Ca/Mg supplement like GH CALiMAGic should help, I think...
    Untouched my source water is 100PPM. Had absolutely no problems until now (mid flower) but I also suspect Ca-. I added EHG Micro which contains Ca, but I think a nutrient lockout prevented it from being taken up by the plant. So I flushed her for 48hrs and then started a 1/2 strength Micro & Bloom blend. Also did a little defol of her fan leaves as they were blocking a lot of the bud sites. Hoping she will come right now.

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    New Member PotheadPanda's Avatar
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    Re: Apparent Ca- or nute lockout

    Quote Originally Posted by andythomthom View Post
    Hey Panda, First off I am a total beginner, this being my first season. But the pH seems to be the biggest red flag to me. Looking at this chart it looks like the plants are missing a ton of good stuff. I had a similar problem last month and corrected pH to 6.5 and fed with Advanced Nutrients Cal-Mag to replace the missing nutrients. http://www.growweedeasy.com/sites/gr...-marijuana.jpg
    Thanks Andy, I'm growing in hydro tho, not soil. I've ruled out pH as the problem.
    andythomthom liked this post
     

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