magnesium def? pix

Hey All,
They don't look too great:(
Leaf tips are burnt and turning upward.
Some brown spots.
Kinda droopy even though i'm not overwatering-- I water every 3 days about 3 cups of h20 tap, shelved for 24 hours to dechlorine and phed to 6.5 to 7.
Some yellow and green stripes on the leaves.I feed every other watering ffgb 2.5 tsp per gal.
run off ph is about 7 i'd say, I'm using the dropper/vial testers.
400w air cooled hood
rh is about 35%-48%
There about 2 mo old, so far have 1 showing as a girl! So i'd like to get this cleared up so I can take some healthy clones!
THanks for any diagnosis you can come up with!
Ughh! I'm almost halfway there!
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heres some more pictures

I don't know a thing about soil but have you seen this link? It's got some great info.....hope it helps.

International Cannagraphic Magazine Forums - The Complete guide to Sick Plants,pH, and Pest troubles!

Hey Weedhound,
As a mattera fact i did:) I can't make a definate diagnosis. It could be mg, or N, but I've been feeding them almost full doses? I'm wondering if maybe my ph is to high. I'm using fill the vial and add drops and compare color method, and runoff is green in color after the drops are added and green = ph 7, but maybe its 7.1 or 7.2 or maybe 6.8.
What nutrients would get locked out with a ph of 7 or a tisch above 7?

need more info....soil mix? Temps? Watering schedule?

If I had to guess I would say you let them get very dry by mistake then over compensated by watering too often. You might have other issues as well or it could be a root problem. More info please.

- Slow -

sorry, just re-read your first post. 3 cups? How big is the pot? You need to learn to water by weighing the pot (By hand....get a feel for a dry pot and a real wet pot). Also, drainage?

- Slow -

hello mate,Magnesium gets locked out of soil growing at ph levels of 2.0-6.4
Magnesium is absorbed best in soil at a ph level of 6.5-9.1 . (Wouldnâ??t recommend having a ph of over 7.0 in soil) anything out of the ranges listed will contribute to a Magnesium deficiency.

Thanks all for your feedback!
Pot size= I'm guessing there 1 gal pots, also have perlite mixed into soil.
So if my ph is just above 7, should the ph of my water be like 6 to to bring the soil ph down to a better level?

say its time to transplant to a bigger pot and perhaps it may help to fix some of the problems your having right now, also you might use epsom salt or cal mag to give your plants a source of magnesuim to see if it helps the problem dont really notice any upward leave curl in the pics but darker veins and leaves curling upwards are usually a good indicator of a magnesuim deficiency.

I was thinking they may be rootbound too, looking at the drainholes, I see roots. So-
Heres my dilema...
I don't have room for 9 plants in 3 gal. containers in my cabinet. Max I can fit 4 3 gal containers. Bye this time I was hoping I'd see more pre-flowers and be able to pull the males. Sadly not the case. I've got 1 showing a girl! So, can I go 12/12 with them rootbound a few weeks and see what I got, then transplant the females?
thanks all
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at 2 months old you should be able to determine sex would check for pistols around the upper nodes a magnifing glass would probably help you see them better.

You've got a couple problems... Ca def (brown splotches),S def (red petioles) and N def (yellow leaves) for sure, you look pot bound, and you need to bring your pH down between 6.5 and 6.8. That will help fix your multiple-nutrient lockout... that, and a foliar feed with a good micro.
What do your temps look like? Are they over 85?

Thanks Stinky! Foliar feed eh? What would you suggest? Maybe time for a digital meter too.
My temps are between 78 and 83.

okay your temps are not contributing then. Good.
I foliar feed with either the GH Micro or Algoflash, but I think the GH micro has more nitrogen in it so would be well-suited for your problem. If you are totally not into buying a micro supplement just for this occasion, a weak grow nute with complete micros will help a bit anyway.
But that's just a quick emergency stop-gap measure; your real problem is most likely in your soil.
You really should flush things out and get anything that might be locked, out of yoru soil. Even if you can't read pH atm, a good flush with tap water even , then a final flush with 1/4 strencth grow fert, and REPOT!!!! The girlies need more space... a gallon per foot.. and they are bushy, so that's a MINIMUM.

Thanks Stinky! Yeah, I'm kinda broke right now so i'm gonna use my grow fert. Can I flush them, transplant, foliar feed tonight? Or do they need some time to recover between transplanting and flushing?

I've got the same situation. I am fairly sure it is Mg def. What are you feeding them?

You can flush right after transplanting. That's fine. And foliar feeding right away is a good idea since they NEED some nutes FAST.
That's not Mg def... :wtf:

Hey there, like your plant looks like it was doing well. However, isn't drooping plant an indication of either over/under-watering? Good Luck.

Yes, the plant has been under watered, but there is a serious feeding issue going on. I am more concerned with the COLOR of the leaves in this case, as it is indicative of a harder-to-fix problem than mere dryness.