plant leaf problems

Wondering what you guys think this is. Happens 2 weeks into flower usually in this room, wondering if it’s from over working these plants with co2, heat or too strong of lights or maybe my VPD is off? 1400 ppm co2 3 led (2.84umol) 1 hps 1000w 1 hps 600 watt. Temp 79-81° F. Humidity 50%

Looks like the beginning of a potassium deficiency. Being that it happened during the beginning of bloom I'm guessing it's a true deficiency not lockout from pH issues. Wouldn't hurt to water to a good runoff using 0ppm 6pH water and measure the pH and ppm just to be sure.

Phosphorus deficiency

hotrodharley said:

Phosphorus deficiency

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Yea I think you’re right I was getting greedy trying to force them to stretch LOL was running half phosphorus. I’ll hit em with full bloom nutes later. Thanks for input

hotrodharley said:

Phosphorus deficiency

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I agree either lacking potassium or phosphorus. Either way supplementing with mpk will fix things.

Hydro Hippie said:

I agree either lacking potassium or phosphorus. Either way supplementing with mpk will fix things.

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I think you’re both right I had smaller plants and wanted them to fill in the canopy and was going in weak on the PK. Bout to double it tonight