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Dankenstein
Registered: 04/21/08
Posts: 46
Last seen: 12 years, 8 months
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Magnesium def?
#426112 - 05/30/10 07:37 PM (14 years, 8 months ago) |
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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 08:26 PM)
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Crusty Ass Bastard
Pheno Hunting
Registered: 08/02/09
Posts: 786
Last seen: 14 years, 5 days
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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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Dankenstein
Registered: 04/21/08
Posts: 46
Last seen: 12 years, 8 months
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Well I'm glad to finally have at least a response to my thread 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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aspore
Cellular Drone
Registered: 04/05/10
Posts: 100
Loc:
Last seen: 12 years, 4 months
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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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