Help Please Is this Nitrogen deficiency or lockout

[smith4924]

I am having issues both in my DWC and my flower room. I have notices the last 3 days stuff starting to yellow a bit but I though it may have been because im already at day 51 in flower. I have a lot of leaves that are now very yellowish white. Here is some photo's to look at. I hope someone can tell me whats going on. Not sure if I need to ass nitrogen or if its locked out. It is 5 out of 18 plants that are yellowing and some that are bright green have a couple bright yellow leaves. I'm stumped please help

Feed is
R/O water 5-8 PPM
H&G A+B 15ML/GALLON
H&G BUD XL 3.8ML/GALLON
CAL-MAG+ 1 1/2 TSP/GALLON
1 Sachet ''65grams'' per feed mixed in a 30 gallon res. Each plant gets close to 2 gallons of feed in 5-7 and 10 gallon fabric pots.
Room temp: 87F
Room Humidity 58%
Co2 PPM: 1300

 

[A4]

Hey TD, are those the plants your LED are on?

 

[smith4924]

No just 3 1000 watt HPS...LED'a are in veg tent where im also having issues. Some leaves are curling on the seraded edges but I think that might be heat issues but im working on it with another a/c Here is more pics...

 

[A4]

Yeah, the serrated edges are heat. You got that one covered but there also looks like some Cal/Mag issues on those leaves as well. It is hard to tell because of the light but it looks like some those leaves are beginning to show dead spots in between the veins. Those that are going white are surrounded by otherwise healthy looking leaves from what I can see so it is not bleaching. Are the leaf stems purple and on any of them that aren't as badly affected, are they yellowing from the stem out towards the tip of the leaf? If so, I think it may be sulfur deficiency on the white leaves. I am no DWC guy as you know but from what I can see that is what I am thinking at this point.

 

[smith4924]

These are not in dwc that's my other issue. These are in pro-mix instead. The cal-mag was an issue 2 weeks ago but I got it under control by going up to 1 1/2 tsp/gallon of cal-mag+. I will have to see in the am about where the yellowing is starting. I let them get a little dry while working this weekend and it seemed to make the yellowing worse. Also I checked the tric's under the scope and on some of my OG13 their is a few amber here and there and its only day 51 so I may be flushing some of them within a week or so I think.. I was surprised when I saw that

 

[smith4924]

So I guess I just need to see if I should flush them or add more nitrogen. I have never used H&G nutrients so I cant say if I have had this problem before. when I used advanced I did not but did have issues with cal-mag