Are these veins showing signs of calmag deficiency?

I am growing in a 4x4, this plant is in a 5gallon fabric pot of Mothers Earth Groundswell soil watered with a 50/50 mix of RO and tap, 2ml of calmag per gallon of water and I pH the water to 6.5 with my Aleta PH20 meter.

The plants are white widow clones transplanted about a week ago, I have a Vivosun VS4000 set to about 60% and sitting about two feet above the plants, and Photon says it’s about 400PPFD.

My temps are a bit low, 68f with the light on, 62f when they are off, and the humidity is around 60%, VPD goes between .5 in the dark and about .9 with the light on.

My cord fans are running high speed constantly and my exhaust fan runs about half speed constantly, and I’m using passive airflow (4” fan with 2 of my 6” openings all the way open).

I’m wondering how these look and possibly if you guys have any other advice based on the info I’ve provided.

First pic yea and you got purple stems

amneziaHaze said:

First pic yea and you got purple stems

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How would you handle this, just add a bit more calmag?

Also, what do purple stems indicate?

I see a slight mag def.. I would foliar spray with epsoms salts.. 1tsp per qt water..

HydoDan said:

I see a slight mag def.. I would foliar spray with epsoms salts.. 1tsp per qt water..

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Can foliar spray be accomplished with a regular spray bottle or would I need a mister? Also, looking up epsom salt, I see some for plants and some for soaking, are those essentially the same thing, because I have some epsom salt for soaking I could use.

dopenixon said:

Can foliar spray be accomplished with a regular spray bottle or would I need a mister? Also, looking up epsom salt, I see some for plants and some for soaking, are those essentially the same thing, because I have some epsom salt for soaking I could use.

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So long as it’s just magnesium sulphate, regular bottle will do fine. Turn your lights down before you spray and wait 20 mins or so for it to dry before turning them back up again so as to avoid burning your foliage.

Okay thanks. I made the solution and sprayed my plants so I’m hoping for the best.

I’m not sure how to like a post but once I figure it out I’ll show you some love on here.

dopenixon said:

How would you handle this, just add a bit more calmag?

Also, what do purple stems indicate?

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Means you need magnesium.you can do a foliar spray of epson salt or just add some in to your feed
0.265g/L should be a safe number but in flower i somethimes give them a gram but not allways( but i allways fight with magnesium sooo....)

amneziaHaze said:

Means you need magnesium.you can do a foliar spray of epson salt or just add some in to your feed
0.265g/L should be a safe number but in flower i somethimes give them a gram but not allways( but i allways fight with magnesium sooo....)

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Do you also use calmag in your water?

dopenixon said:

Can foliar spray be accomplished with a regular spray bottle or would I need a mister? Also, looking up epsom salt, I see some for plants and some for soaking, are those essentially the same thing, because I have some epsom salt for soaking I could use.

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It's best to spray the underside of leaves before lights out and avoid Epsom that's scented. Calcium and magnesium deficiency is rare, it's usually one or the other.

The biggest issue you've got is your temps are 68f lights on.

You need to do something about that ASAP.

Lower extraction or add heat

FYI magnesium deficiency doesn't start at the top of the plant

Does anyone know what ppm/ec the epsom salts should be for foliar?

I tried 1 teaspoon epsom (5g) to a quarter water (1ltr) but it measures 2.5/2.6ec that's well over 2000 ppm isn't that too strong?

coreywebster said:

The biggest issue you've got is your temps are 68f lights on.

You need to do something about that ASAP.

Lower extraction or add heat

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I bought a little 700w oil heater from Amazon and just got it in there last night. it's at 70f with the lights out now, around 74f with them on, and still room to heat up some more if that's not enough. What temps would you recommend?

coreywebster said:

FYI magnesium deficiency doesn't start at the top of the plant

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I was wondering, I've had mag def several times and it never looked like that.

dopenixon said:

Do you also use calmag in your water?

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Sort of yes.master blend has 3 part nutes first part is nutes second is epson salt (magnesium) third is CaNo3(calcium something) and my water is tap water it had lots of calcium but not too much

1212ham said:

I was wondering, I've had mag def several times and it never looked like that.

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This is magnesium purple stem and yellow between the veins how does your look?

dopenixon said:

I bought a little 700w oil heater from Amazon and just got it in there last night. it's at 70f with the lights out now, around 74f with them on, and still room to heat up some more if that's not enough. What temps would you recommend?

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Under LED
In veg about 82f
In flower 78f

Can't you turn your extractor down more ?

amneziaHaze said:

This is magnesium purple stem and yellow between the veins how does your look?

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Plants produce anthocyanins for a number of reasons.
Apart from phosphorus, iron or mag def , they also produce them as a protection due to low temp and high light levels .

Star Dog said:

Does anyone know what ppm/ec the epsom salts should be for foliar?

I tried 1 teaspoon epsom (5g) to a quarter water (1ltr) but it measures 2.5/2.6ec that's well over 2000 ppm isn't that too strong?

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I think it's one tablespoon per gallon. Which is 3 teaspoons, so your probably a bit over.
Try half a teaspoon
You can always spray more times.