Possible Magnesium Deficiency

[growjunky]

Hey guys,

Noticed this issue with my girls about a week ago and it is starting to get worse.

I did some research and figured it could be a Magnesium Deficiency issue which may have come up from ph fluctuations.

The only other thing is that I am currently on 1100ppm at week 5 and this is actually lower than the recommended ppm on the container 1400ppm for veg.

I would really appreciate some second opinions here.

 

[maimunji]

That's crazy ppm for such small plant. Are you sure it is not ec?

 

[corky1968]

That's crazy ppm for such small plant. Are you sure it is not ec?

Improper pH probably causes more problems than the rest with nutrient related issues.
Deal with the pH 1st before you try anything else. Even then try not to change it too
fast. Changing more than 1 full pH number in a day is stressful. So go slow and steady.

 

[growjunky]

@maimunji Yeah I am sure, the package says 1400 is the goal during veg. Every chart says late stay veg max 800.

@corky1968 I check my ph every day or two and adjust it, usually creeps up to 6.8 and I bring it down to 6.

 

[mule420]

@maimunji Yeah I am sure, the package says 1400 is the goal during veg. Every chart says late stay veg max 800.

@corky1968 I check my ph every day or two and adjust it, usually creeps up to 6.8 and I bring it down to 6.

Your PH going up and down that much stresses the plant out like corky said that's almost a full point. My PH swings like 5.8-6.0 over 24-48 hours. You have something going on like water sitting and getting funky in the bottom of your buckets, too hot of Rez, used hydroton, not enough oxygen in your root zone or your feed/water cycle could be off. Hell your pens/testers could be off.

 

[growjunky]

Your PH going up and down that much stresses the plant out like corky said that's almost a full point. My PH swings like 5.8-6.0 over 24-48 hours. You have something going on like water sitting and getting funky in the bottom of your buckets, too hot of Rez, used hydroton, not enough oxygen in your root zone or your feed/water cycle could be off. Hell your pens/testers could be off.

Hmm, I might check the ph fluctuations again over a 24 hour period, I will be getting a air stone for my reservoir soon too. I feed every 3 hours, let the pots sit full for 15 minutes.

I adjust it from every two hours a week ago.

 

[Budley Doright]

View Image

Hey guys,

Noticed this issue with my girls about a week ago and it is starting to get worse.

I did some research and figured it could be a Magnesium Deficiency issue which may have come up from ph fluctuations.

The only other thing is that I am currently on 1100ppm at week 5 and this is actually lower than the recommended ppm on the container 1400ppm for veg.

I would really appreciate some second opinions here.

IMO you probably dont have magnesium def.....simply becasue magnesium would be translocated from lower leaves.... and the lower leaves are perfect show no deficiency....

If anything you would suspect one of the non translocatable micros.... required to manufacture the leaf

but if you are using a well balanced fert in the right amounts.....

then its ph....


In fact the vast majority of sick plant issues are not actually about a micronuitrient but instead a ph problem....

 

[mule420]

Hmm, I might check the ph fluctuations again over a 24 hour period, I will be getting a air stone for my reservoir soon too. I feed every 3 hours, let the pots sit full for 15 minutes.

I adjust it from every two hours a week ago.

You need to have air in some form getting to the root zone, air stones in rez, waterfall, water pump shooting around... What's your rez temp like? the cooler the water the more dissolved oxygen it can hold. My temps in the rez usually run 63*F-70*F or so, any more then 70*F and root rot starts to set in. You can run it hotter but you best know what your doing!


All of the water from your flood cycle needs to go back to the rez. Standing water anywhere in the system needs to be oxygenated! Get some air in your rez! Hide the air pump from your lights, and a fan blowing on the pump works good to cool the air your putting into the rez! Root rot, root slime will raise ph fast just like whats happining to you. Search for some threads by snype over in the hydro section it will clue you in on how to run a dead rez.

 

[corky1968]

Every reservoir should a have an air stone.
Standing water tends to smell over time and
allow bad bugs to thrive.

Oh yeah, a pH of 6.0 is 10 times more acidic that a pH of 7.0.
A pH of 5.0 is 100 times more acidic than a pH 7.0 so do know
big changes is stressful. If you using too much Cal/Mag that
will drive your pH up.

 

[MrBungle]

it could be an Iron or Sulfur def.. which I wouldn't worry about much, just pay attention to rootzone pH

 

[Floridian]

Its like growing in little ferret balls I don't know how you folks do it.

 

[MJPassion]

Your PH going up and down that much stresses the plant out like corky said that's almost a full point. My PH swings like 5.8-6.0 over 24-48 hours. You have something going on like water sitting and getting funky in the bottom of your buckets, too hot of Rez, used hydroton, not enough oxygen in your root zone or your feed/water cycle could be off. Hell your pens/testers could be off.

Hmm, I might check the ph fluctuations again over a 24 hour period, I will be getting a air stone for my reservoir soon too. I feed every 3 hours, let the pots sit full for 15 minutes.

I adjust it from every two hours a week ago.

Check pH several time throughout the day for sevral days.
If your container moisture us variable, your pH will be also.
To what extent, idk but pH swings with moistue content of the medium.

 

[TnTLabs]

you are overfeeding, its obvious as leaves are really dark green,
half strength till you see lighter new growth, the ph problem will go away from its self by then
sounds like you are overdoing it

 

[growjunky]

Hey guys,

Thank you for the information I will be testing all the methods, I just ordered an airstone and have a circulating pump on the way also.

 

[growjunky]

You need to have air in some form getting to the root zone, air stones in rez, waterfall, water pump shooting around... What's your rez temp like? the cooler the water the more dissolved oxygen it can hold. My temps in the rez usually run 63*F-70*F or so, any more then 70*F and root rot starts to set in. You can run it hotter but you best know what your doing!


All of the water from your flood cycle needs to go back to the rez. Standing water anywhere in the system needs to be oxygenated! Get some air in your rez! Hide the air pump from your lights, and a fan blowing on the pump works good to cool the air your putting into the rez! Root rot, root slime will raise ph fast just like whats happining to you. Search for some threads by snype over in the hydro section it will clue you in on how to run a dead rez.

My rez temp usually sits around 63 but drops to 57 sometimes I have never seen it go over 70.

 

[mule420]

My rez temp usually sits around 63 but drops to 57 sometimes I have never seen it go over 70.

That's a little on the cold side and that's good! You can run it up to say 75 and higher if everything else is dialed in, however try to stay 63 to 70 as a guideline. Colder temps ward off root rot/slime.

When we flood the pots were looking to fill the pots with water and nutes, also as the water drains it pulls fresh air down into the root zone. So soaking the roots for 15 minutes is ok if you have lots of air stones in the Rez, if you have no air stones drop the 15 min down to 5 min and flood more often say once every 2 hours... It's a balancing act and frustrating at times but it will pay off in the end!

 

[plutosmoke]

did you check underneath the leaves? Looks sorta like borg infestation to me

 

[marrdogg]

Nobody ever said check ya roots. Says in one post he didn't have air stone. What ya roots look like cause if they look shit no matter what fert you give they wouldn't be able to uptake. Also that's a mag def cause probably by bad roots, who is the guy that says don't worry about sulphur? Bad advice shouldn't be given, try and grow YOUR plants without sulphur and see ya results.
PEACE!

 

[mule420]

Nobody ever said check ya roots. Says in one post he didn't have air stone. What ya roots look like cause if they look shit no matter what fert you give they wouldn't be able to uptake. Also that's a mag def cause probably by bad roots, who is the guy that says don't worry about sulphur? Bad advice shouldn't be given, try and grow YOUR plants without sulphur and see ya results.
PEACE!

He said no air stones because I told him that might be the problem. Did you miss me talking about root rot/ root slime? Every post I'm harping on about air in the root zone. Did you think I meant the hydroton needed the air?

 

[marrdogg]

He said no air stones because I told him that might be the problem. Did you miss me talking about root rot/ root slime? Every post I'm harping on about air in the root zone. Did you think I meant the hydroton needed the air?

Stand corrected and yes I did miss that, but when I mentioned bad advice if read correct I was speaking on the sulphur.
PEACE!