Magnesium deficiency?

[Quien]

Howdy y'all. New grower here,

The border of my leaves started showing signs of what I thought was a magnesium deficiency. I started introducing nutrients when I first noticed it which was the start of week 4. More leaves seem to be affected so now I believe that my diagnosis might have been wrong.

 

[DoloDankness]

What nutrients have you introduced? Note the NPK values of them each in your next post along with how many times you have fed/are feeding. Also make sure that you are using the proper pH water so that the plant can uptake the nutrients you are providing. And to me it almost looks like it is working out of the cal mag deficiency at this point, how long has it been since you have noticed and tried to feed to fix the problem? Sorry for the questions but more info is needed for anyone to be able to help you out. Best of luck!!
-Dolo

 

[Maple_Flail]

what size container is that?

what Ph are your feeding and what PH is your run off?

what are you feeding them now?

this looks like a couple of things are locked out not just magnesium, which looking at the plant is the least of its current concern.

I'm thinking Phosphorus abundance is the issue.. not sure but that is what my gut says with the info at hand.

 

[Quien]

What nutrients have you introduced? Note the NPK values of them each in your next post along with how many times you have fed/are feeding. Also make sure that you are using the proper pH water so that the plant can uptake the nutrients you are providing. And to me it almost looks like it is working out of the cal mag deficiency at this point, how long has it been since you have noticed and tried to feed to fix the problem? Sorry for the questions but more info is needed for anyone to be able to help you out. Best of luck!!
-Dolo

Hey! Sorry for the late reply. I'm using Advanced Nutrients and General Hydro's Calmag. I've attached a screenshot of the feed. It's been exactly a week since I started to try to fix the issue.

Edit: forgot to mention how much I'm feeding and how often. I feed every other day and it's been about 4 feedings.

 

[Quien]

what size container is that?

what Ph are your feeding and what PH is your run off?

what are you feeding them now?

this looks like a couple of things are locked out not just magnesium, which looking at the plant is the least of its current concern.

I'm thinking Phosphorus abundance is the issue.. not sure but that is what my gut says with the info at hand.

I'm not sure the size of the container it's currently in, but I'm transplanting it into a 3 gallon container tonight. pH going in is 6.5, haven't measured the runoff yet.

 

[xet]

Watering too often.

 

[Quien]

Watering too often.

I only water when the soil is dry and the leaves start to droop a bit, should I wait till they're more "droopy" before watering? I don't know the proper term.

I've just replanted the plant in question. I'm going to feed all my plants with just regular 6.5 pH water tomorrow. I used happy frog soil to replant and I know it has mild nutrients in it, so I'm unsure if I should hold off feeding nutrients for a while.

 

[Maple_Flail]

I have a suspicion the run of PH will say much, AN ph perfect + foxfarm happy frog (organic) wouldn't exactly play nice in theory...

 

[Dr.Young]

Just make sure your PH is right.... If your PH is too low it'll deprive Mag.... If PH is too high it'll deprive calcium....


Looks like you may just need to get PH closer to 6 than 7..... Also make sure you treat a VPD chart like its the bible... Its #1
When the air is too dry the plant leaves essentially lose moisture, and the nutrients in the leaves become less diluted, aka more concentrated so you start to see things like calcium excess or magnesium deficiency depending on the part of the plant and if its getting the most direct wind on top of low humidity... Where on the other side of the plant it might not be getting direct wind and looks fine or even the opposite.... Deficient looking, while the others look excess....

Just try to get a even spread of air.... and use fans mainly as a way to stabilize, and get true humidity readings/levels in the entire space. Vs blowing directly on the plants for fresh air.... because in general your air intake is going to provide all the co2 the plant breathes during the day, and oxygen at night... Fans don't do much but dry out leaves in most peoples scenarios.

 

[TanzanianMagic]

Howdy y'all. New grower here,
View attachment 18738407

The border of my leaves started showing signs of what I thought was a magnesium deficiency. I started introducing nutrients when I first noticed it which was the start of week 4. More leaves seem to be affected so now I believe that my diagnosis might have been wrong.

It looks like nitrogen deficiency/lockout.

This usually happens in seedling/vegging when plants are rootbound.

 

[Quien]

I have a suspicion the run of PH will say much, AN ph perfect + foxfarm happy frog (organic) wouldn't exactly play nice in theory...

I'll measure the pH of the runoff next time I water, which should be tonight or tomorrow.

Just make sure your PH is right.... If your PH is too low it'll deprive Mag.... If PH is too high it'll deprive calcium....


Looks like you may just need to get PH closer to 6 than 7..... Also make sure you treat a VPD chart like its the bible... Its #1
When the air is too dry the plant leaves essentially lose moisture, and the nutrients in the leaves become less diluted, aka more concentrated so you start to see things like calcium excess or magnesium deficiency depending on the part of the plant and if its getting the most direct wind on top of low humidity... Where on the other side of the plant it might not be getting direct wind and looks fine or even the opposite.... Deficient looking, while the others look excess....

Just try to get a even spread of air.... and use fans mainly as a way to stabilize, and get true humidity readings/levels in the entire space. Vs blowing directly on the plants for fresh air.... because in general your air intake is going to provide all the co2 the plant breathes during the day, and oxygen at night... Fans don't do much but dry out leaves in most peoples scenarios.

I currently have an inline attached to the veg tent, and will be transferring all 3 plants to my main tent today which has fans to better circulate the air as you've stated.

It looks like nitrogen deficiency/lockout.

This usually happens in seedling/vegging when plants are rootbound.

I'm hoping this is the case! I've just transplanted it so I'm hoping I can save her.

 

[DoloDankness]

I have had pH as an issue in many grows until I finally coughed up the money for a Blue Labs pH and Conductivity Pen. They are worth the money to spend. Very easy to calibrate and set up and the calibration I believe is good for 3 months. Also what Dr. Young said is very true and something I didn't even think about. Let us know how they are doing after the transplant!!

 

[Creeperpark]

Indica's tend to show a high midrib that gives one the impression it's a deficiency. As the younger leaf becomes more mature it expands and the midrib will spread out and be less noticeable. It's a broadleaf or Plantago major.
It's best to allow the plant to get what it needs from the soil first. If you have a quality soil mix the plant will get what it needs.

This vein is called the midrib. All of the veins, the petiole, and the midrib help position the blade so that it is facing the light source. Google

 

[Ca++]

Don't the merricans use the 500 scale? 300ppm seems very low for the amount that went in it.

 

[GoatCheese]

I only water when the soil is dry and the leaves start to droop a bit, should I wait till they're more "droopy" before watering? I don't know the proper term.

I've just replanted the plant in question. I'm going to feed all my plants with just regular 6.5 pH water tomorrow. I used happy frog soil to replant and I know it has mild nutrients in it, so I'm unsure if I should hold off feeding nutrients for a while.

Plants in soil under leds don’t like the soil drying out too much and start to show dehydration symptoms (yellowing/pale, dry leaves) if you allow the soil to get so dry that the leaves will start to droop. It’s good to allow the soil to dry out abit, esp. the top part of the soil, but not so much that the leaves start to droop like it was recommended during the hps & fluoro light-days.

Once you get the watering cycle right you're fine. the plant looks quite good besides the little drying out symptoms.

 

[Creeperpark]

Here's a photo showing what I'm talking about showing the high midrib. When the leaves spread out and become true adult leaves the midrib will spread out and be less apparent.

 

[Creeperpark]

Its easy to confuse magnesium deficiency with a high midrib on new Indica leaves. When you have a lot of plants and they all are doing well but one is "showing that look" it's just that the Indica has more dominant traits than the other ones. The plant above would work out the kinks with what soil it has without adding anything. If it were me I would just up-pott into a larger container. It will be interesting to see your plants using Advance nutrients. Please keep us posted.

 

[Quien]

Its easy to confuse magnesium deficiency with a high midrib on new Indica leaves. When you have a lot of plants and they all are doing well but one is "showing that look" it's just that the Indica has more dominant traits than the other ones. The plant above would work out the kinks with what soil it has without adding anything. If it were me I would just up-pott into a larger container. It will be interesting to see your plants using Advance nutrients. Please keep us posted.

Thank you for the sample pics! The strain I'm growing is from AK Bean Brains, it's my first hybrid so I'm treading on new territory. Both plants are showing the high midrib you're talking about, and it makes sense.

Plants in soil under leds don’t like the soil drying out too much and start to show dehydration symptoms (yellowing/pale, dry leaves) if you allow the soil to get so dry that the leaves will start to droop. It’s good to allow the soil to dry out abit, esp. the top part of the soil, but not so much that the leaves start to droop like it was recommended during the hps & fluoro light-days.

Once you get the watering cycle right you're fine. the plant looks quite good besides the little drying out symptoms.

I've always had issues finding out the sweet spot for watering during veg. I used blumats but don't want to rely on devices for watering. Thanks for your input!

 

[Quien]

Here's an update pic of the plant in question. I've transplanted her and put all 3 of my plants in my main tent.

I'm still trying to find the sweet spot for watering them, as it does seem I am over watering. I'll keep updating my grow diary if yall are interested in keeping up with "Janice"

 

[GoatCheese]

You can learn to estimate the amount of moisture in the soil by lifting the container up (if it’s possible) when you have watered it vs when it’s fairly dry, so that you get familiar with the weight in your hands.

You have to be careful with watering esp. after you have just re-potted your plants cause their root system hasn’t fully grown into the soil properly yet ..especially if the plants are fairly small in size. Larger plants can handle little over watering abit better,