tiny 4 day old

[Bum]

Hi.

I got two 4 day old, 1 in coco and 1 in light mix.
Light is 200w CXB3590 at about 60cm distance.
They only had water+Voodoo Juice+Pirahna.

This one in light mix, looking burned on the leafs edges?

This one in Coco is just tiny and slow. I gave her ph flush with little bit Canna Coco A+B yesterday
but seems no change today. Shes pale around the edges and more green in the middle.


Any ideas?

 

[wiltstone]

Even light mix could be a little hot for a baby. I would give it a week with no nutes and it should adjust. I don't grow coco so somebody else should chime in on that pick

Sent from my SAMSUNG-SGH-I747 using Tapatalk

 

[namvet25]

There to young to give nutes and this probably caused the leaf burn.Hold back on nutes until they get a couple weeks than go very lite dosage of nutes and increase as they get larger.They are producing a root system so they will be slow growing at first but should pickup in a week or so.Also if nutes are chemical make sure you ph your intake water.

 

[Bum]

Im sorry I wasnt clear enough.

The one in lightmix got only water and bennies.

Only the one in coco had a feed, and it was very very small. I read just plain water messes up the coco thats why i put a bit of nutes in it.

 

[woody]

@Bum ive no experience with cobs myself but read theyre pretty powerful- maybe your frying them with light burn? Or is 24 inches your normal seedling height

 

[Waira]

Hey Bum-- I'm leaning toward what sanguine said,... with both looking like this but in different mediums, light is the only common factor... you say 200w, is that a total? What brand, or is it a DIY unit? I have a custom made 2 COB CXB3590, each COB draws 75w, but it's new to me, with only a partial grow under it so far... Man, they are fierce bright! Seedlings need less intense lighting, so even at 2' it might be too much,... Of course, the usual other suspects should be checked--pH of each medium... And coco is a very different one vs. that light mix, or any true soil... it has several unique properties, mostly involving it's CEC characteristics (cation exchange capacity),...for one thing it's a Ca hog, and so extra needs to be added unless you're using a coco specific nute line,... the way you water, dose feeds, etc. is going to be different than that light mix... right, straight water especially RO/DI shouldn't be used alone, Ca-Mg should be added at least, but ideally, a weak nute solution is best and put in regularly,... coco breathes way better than other soil/soilless media so overwatering isn't as big of a concern,... it has a lot in common with DWC in fact!... coco pH is best in upper 5' to low 6's, and so should your inputs be,... higher pH with that light mix (peat based?)... Good on the weak nutes and inoculants! the cotyldons will hold them over initially, but feeds should start within a week,...
.. raise the lights up another foot if you can, and get a pH reading of those pots... have I mentioned to you the Accurate 8 soil pH probe? perfect for this job, and far far better than the damn run-off test and calculation method which is usually full of inherent sources of error,.. we have an improved method here as a sticky article above this section in the Infirmary.... barring badly off pH in both, the lights are likely the cause of these issues,...

 

[Bum]

@Waira

Thanks fam!

Yes its DIY Cree CXB3590 4x 50W. I will raise them the first thing as soon as I get out of bed.

I added no CaMg only a tiny bit of the Canna Coco nutes. Gona give the one in coco an additional flush with spot on pH just to make sure.

I have these pH probes bit not using right now, i will try to find them today.

 

[Bum]

@Waira @sanguine

Okay I raised the panel to 110cm.

I put in the pH probe in the Coco and it showed this

So i measured the runoff in tray from the 5,8 flush and it showed 7.2... Is my Coco broken?

 

[woody]

Your coco media is on the alkaline side alright. What brand is the coco- did you flush it before this test. I know some growers like to flush it before use with ph water
Hows the soil ph reading?

 

[Bum]

Your coco media is on the alkaline side alright. What brand is the coco- did you flush it before this test. I know some growers like to flush it before use with ph water
Hows the soil ph reading?

I use this brand coco http://www.gorilla-grow.com/products/brown-grow-bronze
I did flush it before the first time i used it, before this I had another grow exactly the same in the same coco, they were growing super super slow.