Yellowing Leaves, Striping, leaf loss

[SarahJay]

Hi ,Would like some advice please. This is my first grow and on day 49 from seed. Around day 40 one of my Fast n Vast auto’s and Critical Mass auto’s suddenly started yellowing heavily at the bottom (both had started flowering) and dropped a tonne of leaves. They are grown in plagron light mix were transplanted at 3 weeks into bigger pots with fresh plagron medium.
I observed few problems in veg , all started shortly after first flowers. I started using biobizz grow half strength, 3 weeks ago. Ive been using mollases in waterings between nute feeds. Ive seen some light nute burn across the board (growing 5 plants , 3 fast n vast, 1 northern lights x bluberry and a crit mass, under LED lights 450 and a 600 and i rotate, lights on constant. See photos attached.

 

[bushmasterar15]

Looks to be a zinc deficiency caused by a lock out in the ph range. Do you know what your PH is of your watering or in pot? @Waira or @namvet25 might be able to help you along more when they check in.

 

[SarahJay]

Looks to be a zinc deficiency caused by a lock out in the ph range. Do you know what your PH is of your watering or in pot? @Waira or @namvet25 might be able to help you along more when they check in.

Thanks i look forward to any advice really, this plant has nice buds on it and i dont want to piss her off by either not giving her what she needs or doing too much. Ive Only just started checking ph , run off water was 6.1 at last nute feed.

 

[SarahJay]

Photos in day light

 

[bushmasterar15]

I was just browing through this thread https://www.autoflower.org/threads/...panded-to-include-other-issues-as-well.43164/ it shows the different deficiency's and how they effect plant. Are you feeding any Calmag?

 

[SarahJay]

I was just browing through this thread https://www.autoflower.org/threads/...panded-to-include-other-issues-as-well.43164/ it shows the different deficiency's and how they effect plant. Are you feeding any Calmag?

No i havnt been using so far, but have ordered some calmag just in case its reccomended that i use some based on advice gained here. Should be here tomorrow. Will take a look at that thread now! Thanks

 

[SarahJay]

I was just browing through this thread https://www.autoflower.org/threads/...panded-to-include-other-issues-as-well.43164/ it shows the different deficiency's and how they effect plant. Are you feeding any Calmag?

Looking at that thread i would say mag and or zinc deficiency? I want to prevent it from getting worse

 

[bushmasterar15]

We should be able to get you sorted back, just watch for a reply from Waira or Namvet

 

[Trichome farmer]

Looking at that thread i would say mag and or zinc deficiency? I want to prevent it from getting worse

like bushmaster says waira or namvet are the best people to help here but i would say its mag def from the leds

 

[Rudra]

Looks like sulfur deficiency.