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OfflineDankenstein
Registered: 04/21/08
Posts: 46
Last seen: 4 years, 6 months
Magnesium def?
    #426112 - 05/30/10 09:37 PM (6 years, 6 months 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
Pheno Hunting

Folding@home Statistics
Registered: 08/02/09
Posts: 786
Last seen: 5 years, 9 months
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Re: Magnesium def? [Re: Dankenstein]
    #427590 - 06/02/10 03:17 PM (6 years, 5 months ago)

Quote:

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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OfflineDankenstein
Registered: 04/21/08
Posts: 46
Last seen: 4 years, 6 months
Re: Magnesium def? [Re: Crusty Ass Bastard]
    #427988 - 06/03/10 12:44 AM (6 years, 5 months 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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Offlineaspore
Cellular Drone
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Registered: 04/05/10
Posts: 100
Loc: Flag
Last seen: 4 years, 2 months
Re: Magnesium def? [Re: Dankenstein]
    #435390 - 06/20/10 10:42 AM (6 years, 5 months 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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