Plant Deficiency HELP!

[Ell94]

Hi guys I am doing my first sealed room grow with c02 and Ac. I am noticing all of my plants seem to have what looks like to me as a magnesium deficiency. I am growing in ecothrive coco and feeding canna coco nutes at half strength and have started to add calmag at full strength. I am in late veg feeding with an EC of 1.6-1.8 and PH 5.8. I have flushed my plants with added Calmag with my run off EC and PH the same as what’s going in. If anyone else could
Offer some advice would be great.

Here are some pics.

 

[hazyfontazy]

Drop the cal mag and use Epson salts till they green back up.. Foliar spray and they should green back up pretty quickly

 

[AgentPothead]

Raise your ph, 5.8 is right on the edge of where calcium & magnesium get locked out in hydroponics. I think in hydro you wanna float from 5.8-6.2 if I'm remembering correctly?

 

[gr866]

I would not drop the Cal/Mag but I would begin adding Epsom @ 0.5 to 1 gram per gallon.

 

[f-e]

Ca can push out Mg by taking it's place on the coco. You need to drop it or the more soluble Mg might not get a foothold. While your feed might be 1% Mg, the cal-mag might be 3% but used in nothing like the quality. A good soil may have 300mg per liter, which is 3 times more than many coco feeds, such as canna. Leaving you adding 0.1g of epson per liter just to double it. Any more and Ca and K are at risk of being pushed out.

 

[Ell94]

Thanks for for responses guys. Epsom salts have been ordered and will be here tomorrow. Will do a heavy watering with the canna coco nutes+Epsom salts and check for results over the next few days.

 

[Gazoo31]

Raise your ph, 5.8 is right on the edge of where calcium & magnesium get locked out in hydroponics. I think in hydro you wanna float from 5.8-6.2 if I'm remembering correctly?
View Image

This depends on what chart you use. Every single one is different. I get my best results between 5.7 and 6.1. Start at 5.7 and let the rez climb for the week. I also liked how somebody mentioned adding mgs on top of the camg, not instead.

 

[gr866]

Hi guys I am doing my first sealed room grow with c02 and Ac. I am noticing all of my plants seem to have what looks like to me as a magnesium deficiency. I am growing in ecothrive coco and feeding canna coco nutes at half strength and have started to add calmag at full strength. I am in late veg feeding with an EC of 1.6-1.8 and PH 5.8. I have flushed my plants with added Calmag with my run off EC and PH the same as what’s going in. If anyone else could
Offer some advice would be great.

Here are some pics.

LESS IS MORE

200 ppm of a + b for veg. is plenty.
350 ppm of a + b for flower is plenty.

CaliMagic/Canna A&B ratio
150 ppm/200 ppm = 350
100 ppm/300 ppm = 400
50 ppm/ 400 ppm= 450

Here is a chart the gives the ratios of Calcium in given ppm of A&B.
This Calcium information is purely based on a Canna schedule, using CaliMagic. Once you hit around 700 ppm, Canna base nutes, you no longer need Cal/mag additives.
This is based on slightly rough math but is very close to correct, in my experience.

A&B
3 ml/gal = .4 EC = 200 ppm with around 44 ppm of calcium
4.5 ml/gal = .6 EC = 300 ppm with around 66 ppm of calcium
6.2 ml/gal = .8 EC = 400 ppm with around 88 ppm of calcium
7.7 ml/gal = 1 EC = 500 ppm with around 112 ppm of calcium
9.2 ml/gal = 1.2 EC = 600 ppm with around 135 ppm of calcium.

I use GH Cal/Magic and I believe the recommended rate is 3.5 ml (1 tsp/5 ml)/gallon. I use Canna Coco's line of nutrients but I back off of their recommended rates, as I feel they are way high. For example, in veg I will add only 200 ppm of A&B and in flower 350 ppm. Now these rates do not give me the Cal ratio needed. You need around 150 ppm of calcium alone.....so even if when I'm at 200 ppm if I only added 100 ppm of Calimagic, only 75 is calcium so I would still be a tad short. In flower, I use RO (55 ppm of Cal/Mag), to this I add 0.75 ml Cal/Magic (68 ppm) and 0.5 grams Epsom (63 ppm) per gallon to bring my #'s to 131 ppm, below the 150 ppm needed, That's without the 55 ppm of the RO, then begin adding the base nutrients. But I have been working with this and it seems ok. I believe it has to do with the 55 ppm of Cal/Mag that is added back to my RO water.

pH of 5.8 and let it drift to 6.0 to 6.1. Drip Clean for the win, helps clean the root system of excess nutes and keeps you nozzles clean.

Hope this makes sense!

 

[DrDee]

Hi Guys,
I have an alternate opinion...but not enough info to test it. Seems to me, since Mg is a core photosynthesis molecule, that a severe shortage like that would cause other issues such as areas of leaf necrosis. And it usually follows a bottom up pattern.

But when you have such advanced interveinal chlorosis...it makes me wonder if K is being locked out. Seen others looking like that turn out to be K lockout...but I don't think you're feeding enough to cause it.
JD