First set of true leaves yellowing

[pop22]

could be a ph issue or damping off. I've seen seedlings do this if you can, give it a foliar spray to feed it. seedlings this young are very sensitive. Its not from the lights or they'd all look that way

 

[GoAuto6]

I've used the accurate 8 for years! If you don't have a soil probe get this one! It's the only way to be sure of soil pH.

 

[Rudy]

No problem I'll test for pH but I'm curious why aren't cotyledons showing any signs of pH problems..
I'm kinda hoping I just blasted them to strong with lights too early and newborn serrated leaves couldn't handle it.

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[Rudy]

And when I move the lights up I'll be happy grower again [emoji28]

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[pop22]

Yellowing in plants tends to be like this: If it starts at the bottom and works up, its N deficieny. Top down, usualy needs micro nutrients. Both issues can be caused by PH or diease.

No problem I'll test for pH but I'm curious why aren't cotyledons showing any signs of pH problems..
I'm kinda hoping I just blasted them to strong with lights too early and newborn serrated leaves couldn't handle it.

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[Rudy]

This is not really the case in real life. They can make it sound pH balanced, and maybe under lab conditions it is. But anything you add to any medium changes its pH. If your water is 7.5 and your using soil-less medium at 5.5 you will change the pH. The challenge is to get a clean measurement. Waira always recommends the 'accurate 8' pH meter for soil and soil-less use.

I'm shooting in a dark here but does pH even matter this early since seedling basically needs water only and it will absorb water even in too alkaline or acidic medium

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[GoAuto6]

I'm shooting in a dark here but does pH even matter this early since seedling basically needs water only and it will absorb water even in too alkaline or acidic medium

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pH matters more in the early stages of growth, meaning later in life you can adjust for pH. At early growth you have no time to adjust because they ate so young.

 

[Rudy]

If it is a pH problem, any suggestions how to correct it while plant is this young?
I never actually encountered pH problem since I'm growing organic and it was mostly smooth sailing so far.
Thanks everybody for the feedback

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[Samwell]

What's the current ph of the medium?

 

[Rudy]

I'm not sure about the medium but bottled water I was feeding them measured 8.0 pH :/
Anyway I changed to distilled now and move the light to 35" from the seedlings.
Things seem better now: