Early flowering, turning yellow

[Haunts]

Mephisto Strawberry Nugs
24hr HLG65
25C, 50% RH
Biobizz Light Mix
So since the plant has started to flower it pretty much started yellowing like this over the past 2 days. Now I'm wondering if it's the soil amendment I've used from Royal Queen seeds (pictured below) they claim you basically mix it into the soil at the start and then you just need to add water throughout the grow but I'm wondering if it's ran out and the plant is hungry?

 

[Waira]

Haunts buddy... don't believe them! I have yet to find a true "water only" mix-in, not even GBD's well regarded mix which I still use (the last of actually- )... KindSoil wiffed too,... KIS is supposed to be very good, but even they say plainly that if you want top results, some additional inputs are wise,.. mainly things like kelp, inoculants, Si, humic-fulvic,.. I recommend highly regular input of a micronutrient supp like Earth Juice Microblast,.... and a PK booster!
I'd say she's tapped out in there mate, time to feed a full coverage base bloom nute, consider all the above goodies too... Micro's are notorious for going out too soon, and can be a hidden bottleneck with many other nutes which may show their defc. first, before the micro' defc. does,....
Overall yellowing is a common with S defc., tops first and worst as it's immobile,.. slow P depletion can do this too,... (N defc usually is on lowers strongly until well advanced, few leaves at a time as they get tapped out),... I suspect your short on several things, so get that good base nute with complete nute coverage,... I'd check that in-pot pH too, just to be sure,...
next time, I'm considering trying this mix-in nutrient pack that KIS offers, either for your own custom made soil or used in quality bag soil... But it still needs to be cooked some I think! ..look KIS Organics up-

 

[Haunts]

Thanks Waira for taking a look, my soil PH, well the run off is 6.5. I have some biobizz grow, bloom and top max, would you say to feed the plant with what their schedule says for the week i'm on? It seems the Earth Juice Microblast isnt available here in the UK, is there anything similar you would recommend?

 

[Waira]

what was the pH going in mate? 6.5 is a good sign generally,...
the lights, what's the distance to tops? I'd suggest backing down to 20/4, you'll see no significant loss in yield, trust me,..... sometimes such issues are caused, or magnified by the constant light blasting,... there's some good reading in the myth buster section about this, ... 24/0 is not an automatic positive result, or worth it.... from what I see in here, it's as likely to be problematic (often unlinked to this until later, if ever), as is is somehow beneficial....
Hmmm damn,.... UK and it's supply./choices,... I've no found something to recommend that's similar,... kelp can help, AlgaMic? You need Zn and Fe and S, so read up on those labels.... I'll check in Blue's thread, I think she found something? I don't know what's in general garden centers out there, but micronute's are not limited to cannabis products! :smoking:

 

[Haunts]

The PH going in is 6.6. The light is about 8 inches from the canopy, using a light meter it measures around 65000 lumens at the centre, which I read is just below maximum limits, I think it was 70000 maximum.
I kind of have to keep the lights on because it's cold where my cabinet is located but now the temperature is warming up I'll try switching to 20/4 with the next grow.

 

[Waira]

might be the lights are too close, such intensity can be too much, yet not physically burn,.... lumens, not sure how to translate into ppfd, and from what i gather lumens are not a good measure for PAR and intensity? But this would explain the pale color in part at least,...

 

[Haunts]

You're absolutely right, I've just been reading this article about the differences between, lux, ppfd, par etc. Lumens is not a good measurement. I'll move the plant lower and see how they respond. As always thanks Waira for your help.