Phosphorus deficiency?

[BigB6]

Hi everyone, this is my first photoperiod grow. They are in week 4 of flower.

 

[elcoloan]

You are going to need to give much more info (environment, nutrition, medium type, lighting, watering schedule, etc) for a more precise aid from the experts here. While you share that info and the real help comes by, I'll venture to say it's not a P def... if anything maybe a K def but again, more info is needed i think. Also for you take a look at in the meantime: https://www.autoflower.org/threads/...panded-to-include-other-issues-as-well.43164/

 

[BigB6]

You are going to need to give much more info (environment, nutrition, medium type, lighting, watering schedule, etc) for a more precise aid from the experts here. While you share that info and the real help comes by, I'll venture to say it's not a P def... if anything maybe a K def but again, more info is needed i think. Also for you take a look at in the meantime: https://www.autoflower.org/threads/...panded-to-include-other-issues-as-well.43164/

Thanks man, you're right it does look like that!
These where potted using Plagron batmix and then potted up using the same.
Lights used are zeus pro
They have only been given non pH, declorinated water up to now.
Temps are fine, 25 day 16 night although humidity is on the high side of 60, dehumidifier on the way. I will start them on some bloom and green sensation for a couple of weeks and flush.

 

[Mañ'O'Green]

When you say non-PH the alarm bells go off . We need the whole picture because several things can cause your issues.

Please fill in this form: (copy and paste part is below, this first one tell what specifically to include)

-Problem: (brief description)
-Medium/grow method: soil; soilless-- coco, or peat based like Promix, etc. (please provide the actual product name); DWC, NFT, etc.
-Feed and supplements used: include brand, dosage/strength, frequency of feeding and watering (alone); method-- by hand, drippers, rercirc' or drain-to-waste,... N-P-K #'s too if you can!
-Water source: RO/DI; tap- dechlorinated-?..... EC or TDS reading; pH (don't bother with this on RO/DI, do bother with TDS/EC though to confirm it's working well enough)
-Strain and age
-Climate: night and day ambient T and RH%; res' temperatures; any extremes in T/RH% exposure
- Light used: HID, LED, COB, combo of,... wattage; light cycle hours (20/4, 18/6 , etc.); distance to tops....
-Additional info: PH in the root zone. How long have the plants been affected?...How fast did symptoms appear?... Anything else you think might be relevant..

--Pictures including WHOLE PLANT PICS, and troubled leaves.. use normal light or flash as other light sources ruin color rendering, critical for diagnostics! Turn off the grow lights.

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(copy and paste)-->

Problem:

Medium/grow method:

Feed: and supplements used:

water source:

PH in the root zone:

Strain/age:

light used:

Climate:

Additional info: