Problems need help please

[Vapo]

Hi everyone......I'm starting to see some symptoms on my leaves....I have no idea and need help.....pics below....any help is greatly appreciated..... in coco

 

[MedGrower]

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-- hand, drippers, rercirc' or run 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: max/min night and day ambient, or res' temperatures; relative humidity (RH);
- Light used: HID, LED, COB, combo of,... wattage; light cycle hours (20/4, 18/6 , etc.); distance to tops....
-Additional info: How long have the plants been affected? Have you had the problem before? 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!

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(copy and paste)-->

Problem:

Medium/grow method:

Feed: and supplements used:

water source:

Strain/age:

light used:

Climate:

Additional info:

Infirmary Staff aim to Answer your queries within 24-48 hours.


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Are you able to give the pH of your medium? Depending on what light you are using, what is the distance of the light? This looks to me like a minor Ca -deficiency but it can be sometimes confused at this stage with P deficiency although I cannot spot any darker necrosis that is more typical with P deficiency. That's why pH of your medium would give valuable information to narrow those possibilities down. Leaves show signs of little stress, perhaps lights a bit close?

Also what is the EC / PPM of the solution you are currently giving her? And the EC / PPM of the plain water before nutes?

 

[Waira]

... Vap-- yeah, it's too early in symptoms manifeting to say for sure,... yellowing/necrosis at the "teeth" tips is hinting at a K issue,... trouble is with K, both defc. and toxicity look nearly the same! So, get us info,.. do you do 15-20% run-off each time? coco is a unique medium, lots of do's and don't's to master,.... bungle them, and it's a beating the whole way through!

 

[Vapo]

Thanks guys.....I'm going to keep a close eye on it