Phosphorus Deficiency? How to correct?

Deep Jealousy Autos
Ocean Forrest Soil
3.5 Weeks in this soil. 1.5 weeks into flower.
in 3.9 Gallon AutoPots
Zero Nutrients given besides what's in the soil
Plain Tap water in the reservoir
~30k Lux (I don't have a better meter yet)

Plants seem overall pretty healthy and happy. Maybe a little shorter than I'm used to with some photoperiod strains.. but that's not necessarily a bad thing

Just noticed these little rusty colored spots. Does this look like a phosphorous deficiency and if so, is there an easy way to treat it?

Thanks!

I think a feeding is overdue.

HydroKid239 said:

I think a feeding is overdue.

Click to expand...

Thanks!
What am I feeding them? I was hoping my soil would still be feeding them at this point? Trying to not to gunk up the autopots and use my soil instead. That being said, I can't have them going sideways on me either..

Looks like Ca deficiency to me. Rust spots and slight yellowing of the leaves.

Prodigus said:

Thanks!
What am I feeding them? I was hoping my soil would still be feeding them at this point? Trying to not to gunk up the autopots and use my soil instead. That being said, I can't have them going sideways on me either..

Click to expand...

You can add a few cups worth of fresh FFOF to top soil and simply water in. Soil’s buffering may be waning by now.

A solid topdress will recharge that host medium.

Or you can add 1 or 2 tablespoons of dry bloom fertilizer ( Flower girl / Happy frog fruit and flower / etc ) to also feed it.

Dry fertilizer application will breakdown in plant over roughly 2 weeks - feeding it. Then you can continue feed as necessary as deep flower comes along.

Budzbuddha said:

You can add a few cups worth of fresh FFOF to top soil and simply water in. Soil’s buffering may be waning by now.

A solid topdress will recharge that host medium.

Click to expand...

I'll do that!! Thanks!

buyyouabeer said:

Looks like Ca deficiency to me. Rust spots and slight yellowing of the leaves.

Click to expand...

I have traditionally used CAL/MAG. First time using autopots but I guess I can turn them off for 24 hours and then add some water from the top treated with Cal/Mag over some fresh FFOF. Thanks!!!

If been using the same nutes for years like
Still use the pk 13 14
But it can like burn your plant to
I use a bloom food and veg food bit of nitrogen in it
Not a bad idea topping up the soil up

Prodigus said:

Thanks!
What am I feeding them? I was hoping my soil would still be feeding them at this point? Trying to not to gunk up the autopots and use my soil instead. That being said, I can't have them going sideways on me either..

Click to expand...

If you’re unsure of what to feed.. use trial & error. Only use one type of feed at a time.
At this point in your case I’d use GH max bloom.