A little advice for a newbie??

[DumbJ]

I have 2 autos at about 28 days from seed. Woke up this morning to a bit of browning and yellowing. Haven't started any nutes yet as they are in 2/3 ocean forest and 1/3 prerinsed perlite. Just 6.5 pH water with a teaspoon per gallon of CaMg+. Run off is around 5.9. Headed the the store as soon as they open, was going to start feeding them from the GO Box today but I'd like anyone's input on what this looks like. It's not bad yet but it's starting on both my girls.

Dark devil only on the lower leaf.



Sour diesel has rust spotting on bottom leaf and a bit of yellowing on new leaf.

 

[Waira]

... hey bud-- sorry for the delay! ....top pic, I can't really tell what I'm seeing,... last portion of leaf browned out? SD looks like early defc. symptoms starting, guessing Ca or Mg, but too soon to tell,.... of more concern is that in-soil pH; OF soil has been very bad for some folks lately, lots of reports of low pH's, and you look like one of them,... looks like you soil pH is around 5.5, way to acidic,... you'll need to up your pH's on all inputs,.. too late for lime, etc.,... you might want to consider a flush too,.. get us whole plant pics too please,...

 

[DumbJ]

It's developed a little more and I'm pretty positive it's a ca def. I gave them some GO nutes at 1/4 recommended strength that day and now they're showing a bit of clawing and darkening. So I'm doing a flush right now, doubling up on CaMg+, should I pH it around 7.5 just to help bring it back up?

:Edit:
Flushed with 7.0 RO water, run off was 6.1 so yeah, still too acidic going to chase that with 7.5 with a bit extra CaMg+ and very little liquid humic acid.

 

[DumbJ]

Dark devil. Slight clawing and darkening with purplish stems. No yellowing.



Sour diesel. Also clawing and darkening. Yellowing and rust on bottom leaf getting better.

 

[GCase]

Howdy DJ.

Soil is a tough one indoors. However, you have a good vegan nute box. Next time you will be experienced with the soil and can prep it up for PH before planting.

The plants have a bit of stretch due to either low wattage or too much K. Plus like you say purple stem is an indicator.

I use to flush so much with soil because of PH. Now--you are set and can start regular feeding and PH at usual target.

However, looking back if I had owned my present high quality PH/EC meter--soil might have been more cooperative.

Autos are tough and will produce good bud under all adverse conditions.

Cheers