Nute burn only?

[Vlada]

Hello growers,
I am starting to have an issue with my grow.
Can somebody indetify this issue?
I am growing with biotabs so 100% organic so it is not PH issue.
Nute burn is an issue for sure but I do wonder if there may be something more like Cal or Mag issue?
Link to the grow, in my last post I explained the issue in more details.

https://www.autoflower.org/threads/the-tale-of-psycho-and-green-princess-northern-lights.76939/

 

[CBgrower]

What's your light and distance?

 

[Waira]

she might have hit a hot spot in there next to a Tab,... uppers look light and/or micronute defc. related...

 

[Vlada]

What's your light and distance?

HS1 75w from GN, main cola at distance of 17cm, now even 15cm as not more room. But she was for longer period even at around 14cm without any issue.
The problem started soon after I did first and only midd grow feed with 20ml Orgatrex and 1g Bactrex deluted in 500ml as instructed by Biotabs. So I assume it is nute burn and not light. I also recently intriduced Smart CO2 Bag so heat and light shouod not be a problem. But it may be.
I think she will be fine.

 

[Vlada]

she might have hit a hot spot in there next to a Tab,... uppers look light and/or micronute defc. related...

Do you think it is ok to use CalMag (BioBizz) with biotabs? Lower leafs and some in the mid are dying, thats why I feed her with Orgatex/Bactrex solution, couple days before nut burn like symptoms.
I decided not to use again Orgatex but instead I just added one more Tab having in mind it will take one-two weeks to activate and plant seems to have potentional to grow fat.
Thanks man for opinion! In next grow I will use Silicium Flush.

 

[Waira]

may not be direct light burn, but overly strong light will magnify other problem, cause borderline ones to start showing, cause a more localized bad VPD on the tops,...
I don't see ant Ca or Mg issues here, but a whole plant pic would help,... top biased damage like this is more indicative of micronute and/or environmental problems...

 

[Vlada]

may not be direct light burn, but overly strong light will magnify other problem, cause borderline ones to start showing, cause a more localized bad VPD on the tops,...
I don't see ant Ca or Mg issues here, but a whole plant pic would help,... top biaes damage like this is more indicative of micronute and/or environmental problems...

I will post now more pictures. You will see, bottom and some middle leafs are dying and turning dry. But there is not light there at tentbis very small (40×40×160cm) so it may be normal. Sugar leafs at the top colas are mainly damaged by nute burn looks like symptoms, which happen after feeding. Main cola is burned the most. Light may be too strong for so small space, true.
But in general I am sure plant will survie and the most important, buds are keep growing.
Temps are close to 30C so I have Smart CO2 bag to help plant with heat. I cannot lower temps in this grow.
Before was even at 32C without ant symptoms showing up
I will not add than more CalMag.

 

[Waira]

Ahh, more symptoms than just the tops! those wasted leaves are most likely P defc., she's eating that like crazy now, buds shaping up well so demand is quite high,... more Bio PK, if you have it,...
Close proximity to lights may be triggering symptoms up top,.. do some bending and tying to get the tops out of the more direct blasting light, it may help....

 

[Vlada]

Ahh, more symptoms than just the tops! those wasted leaves are most likely P defc., she's eating that like crazy now, buds shaping up well so demand is quite high,... more Bio PK, if you have it,...
Close proximity to lights may be triggering symptoms up top,.. do some bending and tying to get the tops out of the more direct blasting light, it may help....

It seems right on the spot what you say.
Unfortunately tent is too small for the plant and if I bend the main cola it will shade even more some other branches and even worst, smash them and press them against the sides of the tent. Small light blench at the top of main cola also confirms that plant is too close to the light (at 14 cm distance) . But she is not growing in high anymore and I already had similar small light blench at previous grow and it went well so I assume light blencg will not progress down the cola.
From the photos you can see she is progressing quite well, she is only 54 days old and I think it could hardly go any better in 0.16m2 and with 75w HS1 GN led lamp.
I have only Starter Kit, not Bio PK, but I added another one Tab 6 days ago so I hope it will help. Next grow will have and Silicium Flash and PK.
Do you think she has more than 3 weeks till end, I think she may finish rader fast? Light is working 24/0 and acording to Memfisto Genetics, constant light will shorter grow cycle a bit.

 

[Waira]

she will finish better with more PK going in, if you can swing it,...
Hmmmm, the 24/0 thing,....maybe on the finish speed over an entire cycle, but with symptoms currently, I'd go down to 20/4 with no loss or troubles IMO,...
Not 3 weeks left, sooner maybe 10-14 days...
That last Tab is going in too late really; I'd dig it up, crumble and top dress, scratch in best you can,... it takes time to the tab to really start releasing nutes, longer than you have left, and with the wrong NPK balance for finishing stages...