Anything to worry about?

[Yozhik]

Is there a doctor in the House?

Here is a 10 Day old Sweet Trainwreck Auto.

Medium is Plagron Lightmix.
Feed is Advanced Nutrients Sensi Grow A+B @ 1.0 ml/l, and Radical Nutrients Mr Root @ 1.0 ml/l
Water pH'd to 6.3.
EC of tap water is 0.5
EC of water post-nutrients is 1.5.
Room Temperatures: ... 25 ℃ [+/- 2 ℃]
Humidity RH%: ... 45 [+/- 5%]

THIS appeared overnight.

... anything to be concerned about?

It is the only plant out of 16 in the tent to show this on its leaves.

 

[Grim Reefer]

Hi @Yozhik
It looks like nutrient splash to me.
Have you been misting the plants leaves at all?

 

[Yozhik]

Hi @Yozhik
It looks like nutrient splash to me.
Have you been misting the plants leaves at all?

not intentionally ... I've never looked into any form of foliar feeding.

 

[Grim Reefer]

not intentionally ... I've never looked into any form of foliar feeding.

I was just asking just encase you were misting the plants.
Some phenos can be more sensitive to water misting than others so its just something to watch out for if foliar feeding.
With so many plants to feed at the one time do you think its possible some unintentional splashing occurred?

 

[Yozhik]

I was just asking just encase you were misting the plants.
Some phenos can be more sensitive to water misting than others so its just something to watch out for if foliar feeding.
With so many plants to feed at the one time do you think its possible some unintentional splashing occurred?

Highly likely ... I can't remember it happening, but can't rule it out.

It all points in that direction, 'cos no other plant is showing any similar signs, and there is nothing on any new growth - just those two lower leaves.

 

[jayc93]

Just watch for cal mag issues mine done the same then had cal mag problems on the new sets of leaves ....

 

[jayc93]

I wouldn't worry though @Yozhik looks healthy

 

[Yozhik]

Just watch for cal mag issues mine done the same then had cal mag problems on the new sets of leaves ....

Good to know!
Might add some CalMag in the next feeding, just as a precaution.
It won't hurt to.

 

[Waira]

Hey Yoz! ...good pics, mate... not too many thing this could be for a seedling...this isn't splash damage, from the looks of the darker necrotic margins of affected areas,...likely, some sort of short term pH snafu...new leaves look fine,which is a good sign! Still, it's wise to check on in-medium pH...do you have an Accurate 8 pH probe, or something? Nothing beats direct measurement, and the run-off method is notoriously inaccurate, a fairly crude estimation prone to several measurement errors,... there's an improved method in a sticky article, here in the Infirmary...check it out! I nkow what An says about it's self-buffering, and it's true, but only up to a point...I see way too many AN growers with pH issues that were caused by other things that overwhelmed what the nute's alone could do, including funky off-pH soils/media! :smoking:--trust, but verify, da?

 

[Yozhik]

Hey Yoz! ...good pics, mate... not too many thing this could be for a seedling...this isn't splash damage, from the looks of the darker necrotic margins of affected areas,...likely, some sort of short term pH snafu...new leaves look fine,which is a good sign! Still, it's wise to check on in-medium pH...do you have an Accurate 8 pH probe, or something? Nothing beats direct measurement, and the run-off method is notoriously inaccurate, a fairly crude estimation prone to several measurement errors,... there's an improved method in a sticky article, here in the Infirmary...check it out! I nkow what An says about it's self-buffering, and it's true, but only up to a point...I see way too many AN growers with pH issues that were caused by other things that overwhelmed what the nute's alone could do, including funky off-pH soils/media! :smoking:--trust, but verify, da?

Hey @Waira - thanks for the detailed reply!

I got to be honest, if it's a pH issue, I'm pretty much screwed.
I am 100% anal about pH ... I never ever take the pH Perfect as a given, and I always ... ALWAYS ... check and double check with my trusted Blue Labs combo meter. The meter itself is regularly calibrated and always stored in correct solution.

As already stated, the biggest pH fluctuation allowed in my tent is water pH'd to either 6.3 or 6.4. Nothing else passes strict Quality Control policy!

Tap water here is crap ... pH 7.8 - 8.0 and EC of 0.5 to 0.6 ... so I simply can NOT afford to rely on Advanced Nutrients voodoo to sort that out, no matter what their claims, and regardless of all the happy customers who attest to the miracle buffering ... so yeah, I take zero for granted in that department.



So if it isn't pH going in, then it would need to be pH of the medium?
And again, that would have me completely stumped, because I don't know how I could have one pot with bad pH, but the other pots from the same bag are OK ... or are they? ... maybe this is just the first pot to give me an indication its a bad bag of Plagron Lightmix,, and the others will follow suit. That's scary!

I will take your advice and get myself an 'in medium' meter - just to see where it's at.

Cheers!