How do you this this progression?

What do you think this is? This is an approximate progression of the leaf situation.. Tho not accurate. But you can see how all leaves look in different stages. Please help me diagnose. I am first
time grower.

Medium : Soil
Strain: Watermelon Candy Auto
Stage : Flowering Week 3
Temp: 22-26 deg
RH: 55-70%
Fertilizer: N, P and K now with Tap water. Thinking this might be a Ca deficiency, also gave Ca but situation didnt improve much.

Could this be nute def? Or fungus like Septoria?

What is your medium?

MickFoster said:

What is your medium?

Click to expand...

Soil

Soil is tough Ive done it a few times. Finding a grow method is a lot like when a kitten or puppy picks you as its human. You just try it and its the only thing that works and easily. Id just stick to that. Good luck, Id help but I suck at soil.

What fertiliser are you using, as in what brand?

Nutty sKunK said:

What fertiliser are you using, as in what brand?

Click to expand...

Mostly N and PK-13. Now adding a little.CalMag also.

"Step 4 Adjust pH to 6.o"
For Hydroponics, sure (I like 5.7), but for soil I wouldn't go lower than 6.5 (6.7 works for me).
Dry top dress on tent soil works well, then all they need is good water. I've seen deficiency improvement in as little as 3 days with it, but I prefer to start the run with quality dirt, rather than trying to play doctor later. I'm sure there's a few good soil recipes on here somewhere, you might find one specific to autos for next time.

It looks like the advanced stages of a deficiency to me.
Dead plant material will decay and may cause other issues so keep an eye on that.
If your environment is dialed in, check your soil ph.

I've had a lot of successes and a few failures with soil in tents. It truly is about finding what works for you.
Yield isn't going to be anything to brag about with this run, but first grow buds get you SO f'in baked so who cares.