Nutrition burn? SOS please help

Hi all,

setup:

3X2 tent
2 in vents
1 out
2 samsung board lights of 125W , on of them with UV
temperature 25c+-
humidity 50-55%

empty (no added nutrition) soil mix - peat, perlite, vermiculite.
11lt pot size
3 plants in scrog
strain - super silver haze
40 days since flip (5 weeks and 5 days)

nutritious
Advance nutritious bloom A+B, cal mag from time to time but not on the last few times, sensizym and small amount of big bud.
Never more than 1200 ppm

Watering rate those days is every 4 days+-, they is no over watering and I have 10-15% run off
Water 6.5 ph, always ( I use ph down if needed )
Water temperature 22-23c.

I fed them lately only on the second watering, and only half the recommended

I don't know what I am doing wrong.
They are very sensitive compare to other strains I grew in the same conditions and the same feeding, I was very careful this time not to fed too much.

One thing I should point out - usually I add more perlite.

Every 11L pot drinks 4L. Run off is 0.5L+
My previous grows in 11L use to drink 2.5-3... more perlite.
That is the only change from other successful grows (I do have some issues but not like this time)


Is it nutrition burn or light burn or any kind of deficiency?
The tips are burned also on lower leaves


I just fed 2 of them today with cal mag 2ML per litter and half dosage of bloom A+B (2ML per litter)
Before that only water, and before that also half dosage...

Then I photo them and got scared, there is a change in the timeline and I can see that its getting worse, I have more than a month to go

If flushing is the solution to stop this, can I do it tomorrow after I just watered or is it a problem?

Thanks





Attaching photos of the timeline of the problem


17.2.2024




17.2.2024


17.2.2024

17.2.2024

24.2.2024

25.2.2024


25.2.2024 - from the left plant

25.2.2024 - from the right plant

More photos from now (26.02.2024)

Ok got some answers and updating here, maybe it will help someone:

My main issue is that I let them dry too much before watering... I am waiting until the pot is very very light, dry. I thought its good for them, like home plants. Wrong. That is the reason. That is one of the known reasons for nutrition lock and I didn't know that. All the other conditions are perfect.

The fix - I will flush them with product I got (House & Garden Drip Clean)

I will update in few days.
Thanks all

Hello. It's beautiful.

KarlGG said:

Hello. It's beautiful.

Click to expand...

Thanks!

BTW I think this the issue - too much ppm in my tap water, and me waiting for them to get too dry before each watering..

Wants more PK. All of those flowers are looking to feed more of it.
Many strains are feed hogs.
Leaf symptoms mimic nute burn.

I hear your struggle growmie, my plants are growing but seem to drink half-3/4ths what other folks are watering their plants at my stage in veg. Was dealing with over watering so now I'm hoping they take off after 9 days since last water. But my head's rolling with "are there dry spots? Will that be next to f*** my grow?" Lol

Budzbuddha said:

Wants more PK. All of those flowers are looking to feed more of it.
Many strains are feed hogs.
Leaf symptoms mimic nute burn.

Click to expand...

Yes, specially P. I added the page from the book, look the same.

The problem is that I fed them enough, so they are not getting the nut cause of the nut lock, no?

BTW - every tip on every leaf in all plants - also in the lower parts below the canopy - is burned.

Increase feed strength and frequency. They’ll make it to the end if you don’t do anything, but they’ll be much better with more of everything. Good luck.