Zinc, Magnesium or Iron. This shit is driving me nuts!

[VagPuncher]

Jeez, when it rains it fucking pours.

1) OK, I have 2 grows side by side, in the country. Both are on well water.

2) I have completed 3 grows in each house without ANY trouble.

3) This summer BC had virtually no rain. Both wells ran dry.

4) The wells both just started getting the water back in the wells and we were using that.

5) This deficiency happened in 48 hours and only to the TOP leaves. New growth is curling inwards. Clawing.

6) Room temps are fine at 79.

7) I think it's a mag deficiency and have epsom salt on standby.

8) The leafs have this weird bumpy structure to them. Like warts.

9) The only thing that both houses share is the water source filling the wells.

Coco medium, H&G fed at 750ppm.

 

[E.CoastCannabis]

I think it's a combination of mag and zinc man nothing that can't be fixed though

 

[E.CoastCannabis]

Maybe a little nitrogen too

 

[skull and roses]

Do a 1/2 tsp gal of Epsom salts. I bet it clears up real fast.

 

[PoopyTeaBags]

looks to me like mag and nute burn... flush brother flush...

also could be a ph/ lock out issue...

 

[jayjayfrank]

could salt build up happen in a well when it runs dry?

 

[standsideways]

could salt build up happen in a well when it runs dry?

yep, but it will be more than salt, it will be whatever minerals are in your water..someone will chyme in.

should be the same theory as hard water stains on glasses/faucets/dishwashers/etc

 

[Gardens Keeper]

Magnesium deficiency, the veins have retained their green unlike when it is nitrogen deficiency.

 

[SeaMaiden]

I don't think it's a Mg-, but you can certainly try giving the Epsom as a foliar and if it greens back up you have a starting point. Honestly, occurring in 24hrs, which is pretty much overnight, suggests that what's coming out of that well is fairly laden with crap. Can you filter the water?

 

[Adrift]

are you running ro water??

 

[Gardens Keeper]

I don't think it's a Mg-, but you can certainly try giving the Epsom as a foliar and if it greens back up you have a starting point. Honestly, occurring in 24hrs, which is pretty much overnight, suggests that what's coming out of that well is fairly laden with crap. Can you filter the water?

I tried to edit what I said but it is not letting with such low post count. I believe it is 100% MG deficiency, but this may not be the CAUSE of the deficiency. You might have plenty of MG but pH or salt build up, or a number of other variables only the grower will be able to delineate may be the cause of the deficiency when there is actually plenty of MG. Sorry for not clarifying in my original post. I have no doubt Vagpuncher will be able to figure out the cause though with his breadth and depth of experience.

 

[dank.frank]

Looks pH related to me, honestly. Lock out.

Mg is locked out in low pH - maybe start by checking there.



dank.Frank

 

[Gardens Keeper]

Looks pH related to me, honestly. Lock out.

Mg is locked out in low pH - maybe start by checking there.



dank.Frank

Yes, I would tend to concur with this opinion as the leaves are curling downward and there is no apparent sign of N toxicity. Most likely correct very good answer.

 

[cocogroguy]

Looks like lockout to me too...............I dont see any burn on the edges indicitive of salt buildup or too high PPM. His PPM of 750 is not that high.

Have you been achieving run off or do you usually? I would mix a large batch of medium nutes with a booster of epsom as a foliar for quick delivery once PH has been stabilized in the medium. test that run off on some plants when it starts to come out and also as more run off is achived and compare the numbers on PPM and PH. Although im leaning towards PH cuz i dont think your PPMs are too high.

Also no cal def............no rust spots. So epsom as a foliar will surely help as well getting those level in check once PH is stable.

Keep us posted dude and GL

 

[Gardens Keeper]

Rigidity of the leaves also points to pH I meant to add that in conjunction of the leaf tips curling.

 

[dank.frank]

Well, probably a higher sulfur amount from the dried well....dropped the pH of the water....

Any rotten egg smells or slight compost/rot smells = sulfur = lowered pH = lockout.



dank.Frank

 

[E.CoastCannabis]

Yea im sorry about that first one I would say pH first if that isn't in check already, I figured it was.

 

[VagPuncher]

OK, I woke up this AM and:

1) Calibrated all the PH meters.

2) Got 1000 gallon reservoirs for both places and water delivery to fill them both up with RO water.

3) I watered the plants last nite with epsom salts and all new growth look green. Nothing has progressed. However, the leaves that were damaged did not get better, but from what i've read, Magnesium is immobile and will not repair itself unlike calcium which is mobile and can heal the damage already done. I hope that's correct.

4) I did smell the well water today and it did have an egg like smell.

5) Should I foliar with Mag or continue feeding via waterings? It's entirely possible that this strain which i've never grown is just a mag whore.

I'll continue with updates.

 

[whodare]

I was going to say alkalinity issues but looks like you got it figured out and clean waters on the way.

Good luck

 

[Gardens Keeper]

Sounds like you probably have it figured out with that egg smell confirmation. You are correct in that the damaged leaves will not be repaired, but new growth should be normal. I would not add magnesium to the substrate. A foliar feed is probably good but definitely do not add to substrate especially since you are running CoCo. I am pretty sure the water is the problem and not the deficiency, adding more mag to the substrate would make it worse and not better.