Does this look like K deficiency?

I'll give you all the info you need if you wanna help. But I've been looking stuff up and with the info I have in my head of this grow I think K makes sense. Plus it looks like pictures I see of K deficiency. But I don't know too much, I'm just kinda reaching around in the dark here. Here's some pics

Looks like a potassium deficiency existed but didn’t progress. Saying this because spotting is on the edges only where calcium deficiency would probably be more widespread.

It's right around midway up the plant. I was getting some necrotic leaves down below, but I really think it's just wind damage. I'm going to feed them again tonight so hopefully it'll clear up.

I have just experienced some very similar symptoms

Young seedlings (6 weeks)
- outdoor summer
- browning leaf edges
- some brown spots in the middle of a few leaves ... some becoming holes
- some necrotic leaves low down

But the odd thing was that all my new growth is a healthy dark green

At first it was looking like a nutrient excess or deficiency ... but my end conclusion is in agreement with both hotrodharley and ClaytonNewbilFontaine

I had just topped my seedlings a few days before, when we had some very windy hot days all in a row.

44 km/h | 28 mph
36°C | 96°F

So my logic was:

- the leaves of the young plants were losing water faster than they could replace
= strong wind
= high heat

- the effect of the topping was 'directing the available nutrients' to the new top growth
= due to the wind and heat
... the water supply from roots to leaves was sub-optimal
= the nutrient supply was limited
... by the lack of water transport
= and nutrients were being 'stolen' from the lower leaves
..,. to supply the new growth

hotrodharley said:

Looks like a potassium deficiency existed but didn’t progress. Saying this because spotting is on the edges only where calcium deficiency would probably be more widespread.

Click to expand...

ClaytonNewbilFontaine said:

It's right around midway up the plant. I was getting some necrotic leaves down below, but I really think it's just wind damage. I'm going to feed them again tonight so hopefully it'll clear up.

Click to expand...

More info would be great. What's the ph level? Which nutrients did you use?

I ended up checking soil ph and in the process realized my ph pen was around 2.0 off, and prob had been drifting for the past few months. It had been 6 months since i calibrated it. So my soil was around 5.5, maybe a bit lower. Also my ppms were hella high, so I flushed with 6.2 water until the ppm were around 1000. That was last night. I checked them today, they don't look any worse. It only effected 2 of them. It showed on 1 of the Runtz and the endgame. The other runtz still looks fine, but I'm going to flush it this weekend.

Did I just read "a 6 week seedling" ?

That clawing down with your leaf tips is defiantly nitrogen toxicity. Center plant has it the worst, could be overall toxicity since you said your PPM's were high. But if your PPM's keep climbing then you might need to reduce the amount of N in your feed.

Chow13 said:

That clawing down with your leaf tips is defiantly nitrogen toxicity. Center plant has it the worst, could be overall toxicity since you said your PPM's were high. But if your PPM's keep climbing then you might need to reduce the amount of N in your feed.

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Thank you for that, I think you're right about overall tox. I flushed the 2 worst ones and will get the other one today. I am going to back off on feedings. If I look at one of those nutrient uptake scales I'm prob high in Iron, mag, boron, copper and zinc right? Bc those are the nutrients that get uptaken best with a soil ph of 5-5.5. Then deficient in the others.

From what I have read Soil ph should be 6.0-7.0
hydro/coco should be 5.5-6.5. Anything out of those ranges will usually cause issues.