Day 14 browning on edge of one leave and yellow spots

[ibz]

Hi my seedling is 14 days old now and she seems ok but in the last 2 days on one leaf she has the corner going brown and some odd yellow spots on 2 leaves also the first true leaves are going all brown and look like there dieing
So far feeding consists of 600ml every other day of ppm 500 (bk ground ppm 60) that includes GH micro bloom + calmag + rhizo and I'm in 10L coco air pot

Here is the first true leaves

Here is the affected leaf/leaves

 

[ibz]

The last 2 pics are on the same leaf here is the other leaf

 

[ibz]

The PH is 5.9


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[kbag7]

They look a little hot to me maybe lower the EC will help and specific nutes for coco.

 

[ibz]

They look a little hot to me maybe lower the EC will help and specific nutes for coco.

I'm using GH micro + bloom which I think is ok for coco and cool I will reduce ec to around 400
Do you think I'm ready to run to waste feed yet as I haven't done that at all and I didn't pre saturate all my coco so the outer area of my pot has always been dry as I water around the plant
Thanks

 

[MedGrower]

I may sound like a broken record but it seems to me it is Ca defiency due to too low pH in your coco that makes it hard for the young plant to uptake Ca. I know I used to see similar problems when I went below pH 6.0 with DWC.

What starts as yellow spots, may in couple days turn into rusty spots. Do not worry too much. She will recover totally from this if you gently fix the pH up just a bit.

I have to say this is just my opinion based on my own experiences, someone more experienced may have a different one. So take it as such. Good luck!

 

[ibz]

I may sound like a broken record but it seems to me it is Ca defiency due to too low pH in your coco that makes it hard for the young plant to uptake Ca. I know I used to see similar problems when I went below pH 6.0 with DWC.

What starts as yellow spots, may in couple days turn into rusty spots. Do not worry too much. She will recover totally from this if you gently fix the pH up just a bit.

I have to say this is just my opinion based on my own experiences, someone more experienced may have a different one. So take it as such. Good luck!

Thanks Derek gave me same advice to up the PH slightly so il do that and reduce ec abit
Around 6.1ec is ok?

 

[MedGrower]

I would aim for 6.2 and slighly lower EC for now. Sure the feed strengh is ok really but I remember hearing that lower ECs help with Ca absorbtion.

 

[ibz]

Hey guys hope your all good
So I gave a feed of 800ml with Ph 6.2 and reduced EC to around 380

The affected leaf which is the second set of true leaves has gone pretty bad since yesterday also the other pair looks like it's going bad too

Here's the first affected leaf

Here is the second pair which is started to get these yellow spots

Here is the plant as a whole the rest of the leaves aren't affected so far

I added calmag and I also calibrated PH pen kinda confused

 

[ibz]

The first pic the leaf is pretty dry and crispy and starting to crack
Also the first true leaves are like this too pretty dry and crisp