What deficiency is this ?

[FeNNoMeNa]

Hello,
I have 2 plant at the tent at the moment. The first one got this last month, and now the second one on the picture got it too.
I was thinking its CA/MG def so i gave them bit more but its spreading.
The ph of water is 6.5 the runoff water is 5.9 (SOIL).

Give few advice thank you, the 1st plant is going to be chop down after 2 weeks, but the one on the photo have more time and its getting worse.

Also i looked up and there is no bugs, only the rust spots so it should be either fungal or deficiency ...

 

[Rwise]

You need to get the PH in the soil to 6.0-7.0 (6.5), the leaves say root issue.

 

[FeNNoMeNa]

Hmm one thing that i did to this plant was giving it too less water till last week. It was getting 500-750ml per watering so it was 0 runoff water each 2-3 days. Is that possible reason ? Maybe water did not drain down enough and roots are balling at the center ?

 

[Rwise]

I dont do run off, but the PH is to low.

 

[FeNNoMeNa]

Im thinking if its Potassium Deff ... anyone who know more can tell ?

 

[MeEasy]

You might be waiting a while for someone who knows more to come along. Rwise is one of very few people I hope comes by when I'm stumped on a problem, and I've been doing this shit for 36 years. Now that that's out of the way your plant looks like your ph is low and has been that way for a minute. If mine I would ph 6.8 - 7 a couple gallons of water one of the gallons I would put a 1/2 power nutes ph'ed. Pour the plain water first and the nutes after back my lights off for a day (two if still unhappy) then drop lights and continue as normal

https://www.growweedeasy.com/cannabis-plant-problems/ph-fluctuations

 

[FeNNoMeNa]

Alright,
Since after 2 days i need to water it again probably with the speed she is drying. I will give her 1 gal fresh water + 1 gal water+nutes both phed around 6.9 and hope this will fix the issue.
Rwise is it possible since i changed the soil mix and i guess this one just need to be watered with higher ph ?
And btw thank you for all the responses.

 

[Rwise]

Yes just get the PH up and she'll thank you for it. Myself I use buffers in the soil, pelleted sulfur for down and pelleted dolomite lime for up, and the plant does the work to make the soil perfect.
Edit BTW PH problems often look as deficiencies as the plant cant uptake what it needs.

 

[FeNNoMeNa]

Yes just get the PH up and she'll thank you for it. Myself I use buffers in the soil, pelleted sulfur for down and pelleted dolomite lime for up, and the plant does the work to make the soil perfect.
Edit BTW PH problems often look as deficiencies as the plant cant uptake what it needs.

Thank you i will. But shoud i flush with clean water first or you think i can just raise the ph of the feed i give her to something like 7 ?
Also shoud i remove the leaves who are infected ? Its sad because few days before this i defoliate her ...

 

[Rwise]

A flush will help with salts build up, and good if you use added nutes.
I would let the uglies stay, yes they are damaged but they are still working for the plant, I leave them.
Getting the PH right is the mail goal for the moment.