Magnesium deficiency: how to correct organically?

Good day everyone!
I have a Crystal Widow” that seems to be mag deficient.
I was wondering what to do to supplement more mag and get her back to lush green again.

some info on the grow:
- Medium is coco coir (buffered) 3 gallon pot

- Nutrients/amendments: Gaia green 444, 284, kelp meal, worm castings, myco fungi

- plant is in week 2 of flower, week 12 over-all (she was supposed to be an auto be turned out to be a photo)

I have made a post about this before in a different section and tried the methods given, however I have noticed no difference..
the methods were:
- calmag
- Epsom salts
- dolomite lime

tried all these methods in different weeks during veg, but I can’t seem to keep it away, I still find new affected leaves every morning.
any advice is appreciated!
Thanks for taking the time to read, cheers!

Green_Alchemist said:

Good day everyone!
I have a Crystal Widow” that seems to be mag deficient.
I was wondering what to do to supplement more mag and get her back to lush green again.

some info on the grow:
- Medium is coco coir (buffered) 3 gallon pot

- Nutrients/amendments: Gaia green 444, 284, kelp meal, worm castings, myco fungi

- plant is in week 2 of flower, week 12 over-all (she was supposed to be an auto be turned out to be a photo)

I have made a post about this before in a different section and tried the methods given, however I have noticed no difference..
the methods were:
- calmag
- Epsom salts
- dolomite lime

tried all these methods in different weeks during veg, but I can’t seem to keep it away, I still find new affected leaves every morning.
any advice is appreciated!
Thanks for taking the time to read, cheers!

Click to expand...

Looks more like iron chlorosis... Also, if you are having spotting with it, manganese(not magnesium)... There are 4 things that cause yellowing(chlorosis) N, Mg, Mn, & Fe

Check your runoff PH or do a slurry test, just to see if your PH is way off. I had trouble like this when I switched to a new water source. Also, what do you PH your water to?

Green_Alchemist said:

I have made a post about this before in a different section and tried the methods given, however I have noticed no difference..
the methods were:
- calmag
- Epsom salts
- dolomite lime

Click to expand...

I'm ruling out Mg because of this statement...

Rurumo said:

Check your runoff PH or do a slurry test, just to see if your PH is way off. I had trouble like this when I switched to a new water source. Also, what do you PH your water to?

Click to expand...

Ph above 6.5 will lock out micronutients too. I'm saying that we both can be right lol...

MustangStudFarm said:

Looks more like iron chlorosis... Also, if you are having spotting with it, manganese(not magnesium)... There are 4 things that cause yellowing(chlorosis) N, Mg, Mn, & Fe

Click to expand...

I’m not sure if that’s the issue (iron)
It’s for sure a mobile deficiency and affecting the oldest growth first, I always thought iron was immobile and started with the newest growth?

The calmag I added has iron supplement in it as well, I feel if it was iron def. It would’ve been corrected with the calmag treatment, Though I clearly don’t know because I posted this lol. Really appreciate the input, I’ll do some more reading on what you mentioned and see if that better fits what’s happening

Rurumo said:

Check your runoff PH or do a slurry test, just to see if your PH is way off. I had trouble like this when I switched to a new water source. Also, what do you PH your water to?

Click to expand...

I haven’t done any Ph adjustments honestly, I Ph test before every water but it always sits around 6.2 - 6.4 so I haven’t felt it needed changing

Green_Alchemist said:

I haven’t done any Ph adjustments honestly, I Ph test before every water but it always sits around 6.2 - 6.4 so I haven’t felt it needed changing

Click to expand...

It appears that you are good then!

You said you tried calmag, epsom salts, and dolomite. How much of these did you add, at the same time, or? How much dolomite? I'm thinking you might have a nutrient lockout. They can be tricky with dry amendments.

I did, though in different weeks to not upset anything.

In week 4 I tried Epsom salts (about half a tsp in 2L of water and watered in) I’d water, then reapply another dose but nothing good after a week.
in week 6 I tried calmag, the bottle said 1-1.5ml in 1L of water, but I did 1.1ml in with 1.5L Of water and did this every other watering again 3 times. 2 weeks later I still didn't notice any difference

In week 8 I decided to topdress dolomite lime (very fine powder form) about 2 tbsp scratched/watered into her and have been awaiting results but not looking so good.

I’ve been nervous with this one because it’s my last grow before I have to move, and this will be supplying me until I can get another harvest under my belt after I move and reset everything up to harvest again.

Edit: @Rurumo
My bad I thought I hit the reply button

One thing I've run into before, which I was thinking might be happening here, is that too much calcium will just make a mag def worse. Your coco PH is going to be high now due to the dolomite, which might cause some problems down the road, but the higher PH shouldn't affect mag absorption much. Do you know how high the ppms of your starting water is? Okay, what I would do is check your runoff PH to see what that dolomite is doing, and if it's high, you'll probably need to start PHing your water down lower, like 5.8. I wouldn't add anything else for now, just wait and see how they do over the next week or so, new foliage especially. Coco does best at around a 5.8-6.5 range, but up to 7 won't hurt anything. I've had issues with high alkalinity in my water before and fixed it by PHing my water at 5.5-over time it would rise to 7 in the coco, but during that time it was in the perfect ph range to absorb nutrients-coco is like hydro that way, some ph drift is helpful. Good luck!

I think the main problem is you try to mix two different growing techniques. Coco is technically hydro with tight feeding intervals.

If you use nutrients with slow release it's a recipe for disaster in any hydroponic system. I think you have to choose side. Either build your own soil and do the real organic deal or go hydro running salts. Cheers!

Agreed, the coco really strips the Ca and Mg.If you want to turn it around bottle feed to a lot of runoff every day.
Another option is let the gaia sit in your water 24 hrs, stir it add calmag and feed to runoff every day.Basically like hydro.

coco with organics ? thats why you get deficiencies

get some mineral fertilizer and water everytime at ph 5.8

Just wanted to update:
She is still declining slowly, but growing along.
I’ve given just water for a while, the other day some calmag in the bottom tray to soak in through the root tips at the bottom.
Other than that, I haven’t done much else. A topdress of Gaia last week and that’s all.

Not proud of this girl, but hoping to get something out of her! Or see if I can learn from her and use that knowledge to do better in the future.

Ps:
In the future I will NOT be mixing coco with dry amendments.. Okay in veg but flower has been nothing but issues..

You could just mix up some bottled nutes and feed her,no shame in saving a harvest.

Looks a lot more like N fade than anything else to me. Certainly not low iron as that does affect new growth first. Some plants will yellow like that no matter what you do and you don't want lots of N at this point. Some plants seen to switch from getting N in the pots to stealing it from the older leaves. I had one like that a few grows back and it drove me nuts. It finished a lot earlier than the other plants I had going at the time so maybe that's what's going on here too.

Still lots of green leaves on there so she should finish just fine.

MustangStudFarm said:

Looks more like iron chlorosis... Also, if you are having spotting with it, manganese(not magnesium)... There are 4 things that cause yellowing(chlorosis) N, Mg, Mn, & Fe

Click to expand...

No spotting with low Mg? Think again. Low Mn is extremely rare but lately it seems to be the 'Guess this deficiency' topic around here. Taking the place of the 'Add lots of CalMag' to fix everything mindset.

OldMedUser said:

No spotting with low Mg? Think again. Low Mn is extremely rare but lately it seems to be the 'Guess this deficiency' topic around here. Taking the place of the 'Add lots of CalMag' to fix everything mindset.

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OK, the OP said they added loads of CalMag, epsom salt, and dolomite lime, so you suggest that they add more? Good advice!!! I'm just going to block you now, fuck off!

MustangStudFarm said:

I'm ruling out Mg because of this statement...

Click to expand...

kingromano said:

coco with organics ? thats why you get deficiencies

get some mineral fertilizer and water everytime at ph 5.8

Click to expand...

Good advice, but it's not going to be listened to. It's more likely that they will hurl insults at your good advice to be honest. This guy has several things going wrong for him, but I'm stepping out of this one...