Which deficiency is this?
- Thread starter sero1991
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With the only info being the pic..and with the lights on its even harder to see the colors properly..seems to be potassium lacking. Again, does not mean you should add it as with the given info, it's impossible to tell if its a deficiency, or lockout caused by toxicity of another element or ph out of range. Based solely on the pic..she shows that she's not getting potassium in her..and starting flowering..she will be using that along with magnesium the most.
I see.
pH is always 6.8 or 7 the soil is a bit acidic that’s why I pH at so high the run off comes to about 6.6 or 6.4
Lights are 600w led at 24 inches away
Humidity is now at 50
Temps runs between 80-75
I use 1/2 strength Tiger Bloom 2-8-4 and give it Big Bloom with 1/2 tbls of unsuphered molasses every other watering. I don’t supliment with cal mag and maybe that’s what’s going on?
Try to take a pic without led's on. It does not appear to be a calcium deficiency at all..magnesium though is likely missing or locked out. Half a tablespoon of molasses seems a bit much. The plant is not flowering yet, so not much need for the phosphorus from both big bloom and molasses. With the added molasses it can throw things out of whack. I only speak from experience with molasses. It's high in iron and potassium as well. Generally too much nitrogen (ammonium form), calcium or phosphorus, will lock out potassium. Take a look at this pic and see if it helps
http://ww2.marijuanagrowing.com/wp-content/uploads/2015/03/CannabisPoster4000.jpg
polishpollack
Well-Known Member
too much fertilizer.
Look s like classic magnesium deficiency. Check out magnesium deficiency on a horticultural website/book for reference.
The leaves form a V shape of yellow on the leaves, which i think youll find yours are starting to form. Magnesium deficiency works its way from the bottom up. Its hard to tell whether you have deficiency or lockout without being there. Though if your ph is in the range you state, magnesium should be very available. Id say to aim for a ph of 6 - 6.5. Try a quater dose of ebsom, and look for improvement.
Good luck.
polishpollack
Well-Known Member
That's not right. mag def looks like small golden yellow spots. that's not what the pic shows.
slinkysaurus
Well-Known Member
Just to check, you are letting your water sit and bubble for 24 hours before you give it to the plant? This gets rid of the Chlorine.
Chlorine binds with your feeds and creates Sodium Chloride. This will stick to your roots (essentially) and not alow it to uptake any new nutrients and can be the start of a slippery slope of diagnosing multiple inflictions.
Always add a little Cal/Mag in with your feeding regime too, 1-2ml per litre of water.
Chlorine binds with your feeds and creates Sodium Chloride. This will stick to your roots (essentially) and not alow it to uptake any new nutrients and can be the start of a slippery slope of diagnosing multiple inflictions.
Always add a little Cal/Mag in with your feeding regime too, 1-2ml per litre of water.
Terry385
Well-Known Member
Way to much nutrients for a small plant you fried her... just my 2 cent
Ph? Adjust
Ec? Adjust
If you're in a big pot dont go by your runoff in soil. You're only getting an average that way.
Go from there!
Good luck
Tim
polishpollack
Well-Known Member
useless comments? adjust.
how does going by runoff from soil create an average?
how does going by runoff from soil create an average?
It has nothing to do with iron deficiency. Iron deficiency is at the very top only, and the yellowing is intervenial which starts at the base of the leaf and moves out towards the tip. Seems it's potassium, but with no other pics visible, one has to go by the info given. We don't even know what he's growing in..just said 'soil'? Feeding something that is 2-8-4 may not be great either. A plant should never get more phosphorus than potassium unless a clear deficiency exists. If P accumulates, it will cause potassium issues. OP seems to have left, so i think we're just debating this amongst ourselves lol.