New Grower What are your thoughts on RO Water?

[Muddy]

Great. You've got me curious now and I'd like to see what they look like.

 

[A4]

So, here are some pictures of the affected plant. I tried to get good ones but it is really hard to do without a flash. You can see on the young leaves, the tell tale banding in the veins and the older leaves look very healthy.

 

[GoAuto6]

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ttthis is a mg def. looks kinda like yours....? maybe
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[A4]

It looks close if you aren't real skilled with deficiencies but if you look close mag deficiencies normally start with the older, lower and middle leaves. There is normally some necrotic spots that show up as well. If you look real close at the plant you posted, you will see the yellowing is in the lower and middle fan leaves and hasn't worked it's way up the plant yet but is close. Look real close at the youngest leaves on that plant and you will see that they are still nice and healthy. That is definitely Mag. But, if you compare that to my plant, you will see that mine is perfectly fine in the lower and middle leaves and the only affected leaves are the younger ones. At first appearance the do look the same but you can always tell by which way the patterns run. Deficiencies running old leaves to young leaves will generally be Mag, younger leaves to older leaves will generally be Zinc or Iron. Both Zinc and Iron look almost the same except Iron, like Muddy said earlier, will normally appear very white compared to the yellow/lime-green colors with Zinc.

Thanks GA6! I do appreciate the help bro.

Oh, and one other thing in case anyone is ever reading this post. You will never see necrosis on the leaf margins with Zinc. If it gets bad you will see the tips beginning to dry out and die but the plant will look like a zebra before you ever get to that point.

 

[Muddy]

After seeing the pictures I have to agree on the zinc. That it happened so quickly, is only affecting new growth and what looks in the pictures to be some distorted new growth all point to a zinc deficiency.

 

[A4]

Yep, no doubt, like I said though, it has only happened twice and both times when I have swapped to RO in the middle of the grow and both times within 2 days of using the RO water. There has to be some correlation I just can't come to a good conclusion. I think if I had started with RO water it wouldn't happen but switching in the middle is what is causing it. I won't do it again but I am curious as to why.

 

[Mr Piggy]

Honestly I'm still hesitant to say it's zinc. I know you're growing soiless in pro-mix, but I'm having trouble imagining an organic compound like peat lacking for zinc. I'm going to go out on a limb here but I think it may be early stage mag def. I don't see your plant lacking zinc that quick and to be fair lots of things start early stage with tiger striping http://www.marijuanapassion.com/forum/attachment.php?attachmentid=158412&d=1295751999

What most people don't realize about cal/mag is they compliment each other at a 3-1 ratio and that the plant uses so much of them they should be considered a macro nutrient like NPK. I think being in pro-mix your plant has grown just fine with the limited dolomite that is already in the substrate but has used it up now that it's in flower and larger. This may be why you are seeing the established growth doing fine and the new stuff showing deff right off the bat.

Are you using a cal/mag supplement along with your GH program? and while we're on it what GH nutes are you using in your program?

I'm just so skeptical as zinc dep is such a RARE thing.

As a warning this post is based off of pure speculation, not solid fact and I do not stand by it as good science. I'm just high and trying to help out :

 

[A4]

As a warning this post is based off of pure speculation, not solid fact and I do not stand by it as good science. I'm just high and trying to help out :

And I can guarantee it won't be based off pure science in the future either because I will not try to recreate the circumstances under any conditions.

Yes, I generally use Cal/Mag.

My feed schedule is below. Hopefully it makes sense. It was worse, I transcribed the best I could.

7/12 - Transplanted to 5 gal + rapid rooter 2.5ml/gallon 2 gal total @ 6.3
7/20 - Watered
7/26 - Fed 50% 2.5Grow, 2.5Micro, .5Bloom, 1.25 Rapid Start, 2.5 Diamond Nectar, .5 Floralicious Plus, 2.5 Flora BlendB
8/03 - Fed 75% early growth + silica
8/06 - Fed 5ml silica/3 gallons, 10ml/gal FloraBlend, 10ml/gal Cal/Mag
8/10 - 5ml silica 100% feed per early growth 10ml/gal Cal/Mag

 

[Mr Piggy]

Then I'm at a loss. I'm not used to seeing micro dep in plants. Have you hit her with a micro solution?

 

[A4]

I have foliar fed the last two days with chelated micros.