Please Help Yellow/purple/burnt Leaves

[Snowman420]

Hey guys, little background info 1st off

Started from seed 01-06-18
Flipped 09-08-18 (week 6 flower atm)
Strain: ak48 x lemon haze
Medium : coco coir 70% perlite 30%
Pot size : 16L
Lights : 600watt hps
Enviro : temp 22-26 Celsius
Humidity : 40-60% (usually 50)
Water ph : usually 6 but varies within 5.8-6.2 not entirely sure what my run off is at
Nutrients : 2ml/L BAC organic bloom nutrients (npk 6-5-6) + 2ml/L BAC organic PK booster (npk 4-2-8)
They also get a small amount of great white every now and again
Water schedule: 2L of nutrients at that mixture each plant, every second day(mon,wed,fri so on)
The pots are pre light when I water em and the top 15cm are dry.
They have had a bit of an aphid infestation(not severe but bad in some places) that I am just now defeating (for now lol) by squashing them (don’t want to use chemicals or soap or whatever)

But anyyyyywayyyy to the point, on one plant the oldest fan leaves appear to be turning yellow/white and dying, and the middle and top fan leaves are going a yellow/dark purple/off green colour and slowly dying (this is the taller plant) it looks like a deficiency but it’s been getting plenty of nutrients.

The second bushier plant seems to be getting yellow/brownish starting from the tips of the smaller fan leaves around the middle of the plant and surrounding arms (I’m thinking both cases could be lockout any input and advice on how to go about fixing them is greatly appreciated, this is my 1st indoor grow and I’ve still got a lot to learn, thank you very much, long post I know, pics attached.

 

[Jack og]

Well here is a chart to help ya
Looks like a combo happening, potentially, potassium and zinc deficiencies
And tips say nute burn, maybe dealing with a lockout situation.
When was it last really flushed?
I usually flush before flip and once during flower when I up my flower nutes.

 

[Snowman420]

It’s only every really been flushed when they got flipped to 12/12, I’m thinking of giving it a good flush with plain ph’d water (around ph6) check runoff and make sure it goes to six and then go back to my usual schedule, I’m new to these nutrients, they guy at my local hydro shop highly recommends them so yeh poss just a lockout then buildup, I don’t know

 

[Smoking Gun]

There was another thread on here that was talking about getting colors out of the plants, sorry I can’t remember the thread name, but I believe it was stated in there that what you are seeing is a copper deficiency. Try and search for the thread, that may be useful.

 

[1diesel1]

Must flush every week in flower. Preferably with bone meal. Feed 3 days flush 4th day dry 5th day then back to feed.

 

[DGP]

We try to get some of our hybrids to finish in Fall colors like yellow orange and especially dark purple. I could be wrong but anytime after week 6 or 7 I expect Fall colors to start showing as the plant finishes and starts using it's reserves in some of the larger leaves. Couldn't this just be a normal, healthy Fall color change related to their age and cycle?

My indoor plants do this in week 6-ish and my outdoor ones do it as well especially right about now in the N hemisphere....

I really think it may not be a deficiency at all.

Dee

 

[CaliRooted]

Normal

 

[MamaBear]

Your plants are "finishing" (getting ready to die) which is exactly what you want. Fall colors are beautiful, especially the purple color. They are "giving up" their leaves as they finish because they don't need them any more. Look outside, most of the plants, bushes and trees are doing the same thing.
Looks TASTY!!!

 

[madgrower]

Your plants are "finishing" (getting ready to die) which is exactly what you want. Fall colors are beautiful, especially the purple color. They are "giving up" their leaves as they finish because they don't need them any more. Look outside, most of the plants, bushes and trees are doing the same thing.
Looks TASTY!!!

Agree

 

[OldManRiver]

Must flush every week in flower. Preferably with bone meal. Feed 3 days flush 4th day dry 5th day then back to feed.

Horseshit

 

[Snowman420]

Okay thank you everyone for all the feedback!
I’ll adress what I can
1st I’m looking at pics and really having trouble putting my finger on exactly what it is, could be a combo of cal, mag, zinc etc, but The fertz I’m using should have heaps in it, I’ve talked to the guy at my hydro shop and he’s told me I’d be wasting money getting some Calmag or other shit to add.

2ndwith flushing every week (or 5th water or whatever) I’m not entirely sure on that, it’s organic nutes, and opinion seems to be pretty split on the idea of continual feeds vs regular flush, this is coco to and is watered pre much to purge every time.

3rd the finish colours idea, as much as I would love to think this is it (trust me I would) this particular plant (the tall one with purpling leafs) is looking pretty unhealthy compared, it’s basically stalled new bud growth, and yeh is just looking bad compared to the girl next to it. I also have the same strain running in a different room, 2 weeks ahead, not seeing the same problems... I’ll add some pics (1st will be the healthy plant next to sick one) (2nd just the sick plant)(3rd/4th just healthy plant)(5th/6th plants in week 8 -9 flower so 2 weeks ahead) (7th bud pic for your pleasure :)

 

[1diesel1]

Horseshit

Horseshit

i will not flush with horseshit. I do not see any feasible way it will benefit plants in flowering. Although horseshit does serve a perpose in creating magical mushrooms when deposited into the ecosystem and left to ferment.

 

[Smoking Gun]

This is the thread I was talking about, maybe it will help.

https://www.thcfarmer.com/community/threads/looking-for-new-strain-what-strain-is-this.98356/