Sensi Seeds Auto Hindu Kush - Identifying what's wrong

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Hello fellow growers, how are you today?

So, I have a 38 day old Auto Hindu Kush from Sensi Seeds, and I think she might be experiencing some kind of deficienty or (maybe) pH problems?

I've been noticing that she's not quite the same green hue as the other plants (FastBuds's GSC, Advanced Seeds's Amnesia, Sweet Seeds's Red Poison and 00 Seed's Cheese Berry and NL), but instead a lime(ish) green hue. And also, I've been seeing some reddish stems (picture below).

She's been different from the others since the early stages but she grew quite well without any kind of problem so I really didn't worry that much. But now, she's almost finished with her pre-flowering stage (I'm almost sure her vertical growth spurt is done.) and some lower leaves have been falling or ortherwise yellowing and the rest of the leaves turning lighter in color. I'm still giving her Veg. Nutes (Advanced Nutrients Sensi) and I always pH the water to 6.5, but I'm starting Flowering Nutes in the next feed day.


Now, some grow specs for easy inspection:

Medium: Soil (Light-Mix) + 30% extra perlite
Lights: Viparspectra Reflector Series 600W + Dual Spectrum HPS 250W
Temps: 24-26C
RH: 40-50%

I took some pictures of my baby so you guys can see what I'm seeing. In the ones with the LED lighting you can clearly see that she's different from the others.

If any of you want more detail about the grow just ask, I'll gladly answer any question.

Thank you so much and sorry for the long post. :joy:
 

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carry the veg nutes into the third week, step down dosage. give full power flower stuff then stepping up. looking at those pics she looks good. i think maybe you have the light a little high as you spacing looks to be off some. As for those leaves you "could" have a few things possible. im not going to scare you here and give you what ifs. Where i would go is get myself some azomite or something similar and foliar feed aswell soil drench.
 
:toke:-- MC, i think you have some lower fans fading out from N defc., not that unusual at this stage, and on a nice sizable plant like that, and mild feeds, it can easily happen sooner or more than usual,... I think i see some other low-mid level leaves showing early Mg defc (interveinal color fade),.. easy fix, add some Ca-Mg into you feed regime,.. certain brands will also have significant amounts of N in them (compounded with nitrates, as opposed to carbonates),... 4-0-0, 2-0-0,... some are higher, so beware, too much N now is not good,...others can be 1-0-0 or even 0-0-0, so depending on what you use, be mindful of overall N input,.. just make sure your P-K #'s are well above total N, as you shift to bloom nutes,.. assess what you have in the AN line, and other supplements,... if it continues at a fast pace (N defc.), you can tinker with the nutes to slow fan tapping down some,... Mg defc. can correct in the leaves, so watch them as well,...
 
@Waira May I suggest magnesium sulphate instead of Ca/MG, the anthocyan and fade look like a very light sulphur deficiency to me.

Besides that, yes, shaded leaves die off like that. It's normal.
 
... sure, it'll work, but I don't see S defc. symptoms myself,.... it's immobile, and while it tends to fade the plant all over as it advances, it starts at or near the top first and worst,... tops look OK to me,..
 
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