RDWC Plant Problems ? Nute burn?

This is my first RDWC grow and I've read a lot and have done quite a bit of research so I have most everything dialed in, so this has been boggling my mind and I hope to get some of your advice.

My plants were doing fine when I first put them in the system from their coco solo cups, I had very rapid growth and they were thriving. My nute solution never got above 350ppm which is quite low for the plants being almost 4 weeks old. I've always been up way higher at this point with no problems. At first I thought it was a Phosphorus deficiency because the leaves were curling and had a little brown on the older fan leaves, so I put some more GH Bloom in just about 7tsp which only brought the ppm up to 370 or so. The plants seemed to get worse going into the next day so I flushed it all out and put just fresh water back in. I've also been topping off with fresh RO water. Does this look like Nutrient burn? I really don't see how it can be a deficiency seeing that I'm using the 3 part nutes. I've used the H202 in small doses as well to keep pathogens out, no more than 1tsp per gal. I think they're just very sensitive to nutrients. from day to day ppms didn't change much, seemed like they were drinking more water and not uptaking a lot of nutes.

Strain: Big Bud - Feminized
Water: RO
Temp: 74-78
Rez: 22 gal
Ph: 5.9-6.2 (double checked with liquid solution)
Nutes: GH Flora Series, CalMag, Rapid Start, and H202 when needed.
Water Temps: 74-77 ( I don't have room for a chiller so I'm stuck at these temps for now, haven't seen any root problems yet)
PPM: Never got over 350, and i've calibrated and checked my meter.
Light: Platinum Series LED P900
 

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loftygoals

Well-Known Member
Cacium deficiency. How much calmag are you adding to the RO water?

I have 215ppm tap water and still add calmag to make 280ppm before adding nutes.

Also need a root pic.
 
Cacium deficiency. How much calmag are you adding to the RO water?

I have 215ppm tap water and still add calmag to make 280ppm before adding nutes.

Also need a root pic.
The GH Flora Series has Cal Mag, so I haven't been putting much in at all. You think that's the issue? I'll get a root pic when I get home. Thanks
 

loftygoals

Well-Known Member
The GH Flora Series has Cal Mag, so I haven't been putting much in at all. You think that's the issue? I'll get a root pic when I get home. Thanks
If it looks like a dog, walks like a dog and barks like a dog... it's a dog.

Your pics show classic calcium deficiency and you're growing in RO water which is prone to calcium deficiency... so I think we have an answer ;)

There is no way you'll be getting nute burn at 380 ppm so put that out of your mind. Next time you make up nutrients add the normal amount of calmag you were using first and check the PPM. If it's plain RO water you'll really need 150ppm at a bare minimum (IMO).
 
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