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Registered: 04/21/08
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Magnesium def?
    #426112 - 05/30/10 09:37 PM (8 years, 21 days ago)

Thanks for looking at my thread here.  These problems are from the plants in this thread: http://www.growery.org/forums/showflat.php/Number/422315

There are 6 plants but not all are as messed up as in these pictures.  I suspect magnesium deficiency and/or overfertilization.  I have also been battling with thrips on these plants though they don't seem to be a huge problem anymore.  I use foxfarm nutrients (grow big, big bud, tiger bloom) and usually go for 1/2 strength, though on one occasion I accidentally used a full strength solution.  I did a foliar spray just the other night with 2tsp/gallon dissolved epsom salts and a little bit of kelp.  Leaves have been dying from the bottom up but also upper leaves have been curling upwards with rusty/necrotic spots and increasing chlorosis.  There is some purpling of petioles.  Any ideas?

EDIT: Daytime temp is about 70°F and humidity usually from 35-55%.  The medium is Sunshine "Natural and Organic" (Organic version of mix #4).  I am used to using fox farm soils which have a lot of added nutrients but this seems to be just peat, perlite, dolomite lime, and a wetting agent.


Thank you for any input.  If I left out important details or you would like more pictures or have any questions I will be happy to oblige.

Edited by Dankenstein (05/30/10 10:26 PM)

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OfflineCrusty Ass Bastard
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Re: Magnesium def? [Re: Dankenstein]
    #427590 - 06/02/10 03:17 PM (8 years, 18 days ago)


Dankenstein said:
I did a foliar spray just the other night with 2tsp/gallon dissolved epsom salts and a little bit of kelp.

How often are you spraying them? Pics 3-5 look like they were sprayed during lights on IMO.

#1-2 are harder to pin but a lot of the yellowing in #2 looks natural for week 5 of 12/12. CalMag if in doubt. Foliar spraying often depletes the calcium stored in leaves and that could be as much of the problem as Mg.

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Re: Magnesium def? [Re: Crusty Ass Bastard]
    #427988 - 06/03/10 12:44 AM (8 years, 18 days ago)

Well I'm glad to finally have at least a response to my thread :laugh:  The spots definitely aren't from foliar feeding - the only time I have foliar fed has been since the damage appeared.  Previously I have sprayed with neem/coco wetting agent but those leaves didn't even exist yet at that point and I am very careful to do it right before the lights shut off even then.

Next watering I'm planning on a 1/4 strength dose of some nitrogen with some epsom salts to see if it helps.

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Re: Magnesium def? [Re: Dankenstein]
    #435390 - 06/20/10 10:42 AM (8 years, 1 day ago)

I also am having a mag def, but it's more of a turning of the leaves. Is this correct? I am rushes, will try to coment more later.

"To live the life you only see, in the stores and on TV,
Is to take away the seed, the roots, and stem of all we need."

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