It doesn't have that look, but you could test your runoff PPM and see what that tells you. If your feed goes in at an EC of 2.0 and comes out significantly higher then you have a salt buildup.
I do see a phosphorous deficiency among other possible deficiencies that could be caused by pH or just a lacking feed.
At first I would like to thank you for your interest, I have already made a thread here one month ago, but it ended up with argumentation between two wellknown members and thats how it ends. But it left me here even more lost then I was before.
You wrote that you see deficiencies, I agree and most of the growers who answered my thread “Kindly asking for help” too. Now its necesarry to write down the background... Lets pretend my soil pH is ideal (first measures of runoffs pH was always a little bit lower than input water pH). I was growing 3 plants in soil under the 300w led light in one diy pot (35x60x30cm) from wood and geotextile inside and heating pad in the bottom. So the pot takes usaually 5 days until it dries out. I added nutricients from Plagron every watering since 2nd week of flowering (6th week from germination) in a dosage of 25%of recommended amount. Dosage was increasing every watering untill 10th week of flowering up to the 75% of recommended amount. At the beggining of grow I was adding power roots in half reccomend dose and some vitamines in the same dose. Flowers did not show any deficiencies untill that time (around 9th week of flowering), maybe some fading yellowing leaves at the bottom parts. And than, like it happened over night, one of the girls started showing light deficiencies (probably cal or mag, because I did not used it anytime I watered) and next day more and after fiive days it happens terribly. Runoff pH went to 5,5 eventhou I was watering with plein water pHed to 7,0 instead of 6,5-6,7 I did before. EC runoff was around 2.0. This “nute def” hit one of the girls really hard (on the pictures), one started showing the same symptoms day before 2 dark days before harvest so very lightly and the last one not at all.
So my conclusion is like this (and would really apreciate your opinion): they were locked out of basic nuts (NPK) because of a lack of calcium or magnesium...? Or overfertilized (soil has so much amonium based fertilizer, which caused pH soil is too low for uptake nutricients)...? I am almost sure that it is NOT ”normal” nutricient defifiency, because the leaf necrosis hits only the top bud fan leaves and started to hit also sugar leaves, but the lover leaves did not look like this. Thank you for you time.