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.