Issues with few plants in veg

[Seed collector]

Why do some leaf on 4 of my plants look like this rest are perfectly fine , they all are on same nutes ,please advice

 

[buzz66]

What are you growing in?
What is you nutrient strength in EC
What is the PH of your Nutrient
How often do you feed.

Could be just overwatering
Could be Fungus Gnats
Could be PH nutrient lockout

 

[Seed collector]

What are you growing in?
What is you nutrient strength in EC
What is the PH of your Nutrient
How often do you feed.

Could be just overwatering
Could be Fungus Gnats
Could be PH nutrient lockout

Hi,

They are all grown in biobizz light mix soil

I have water res which holds 200 litres of declorinated water, air bubbles and water pump for constant water flow

Ph 6.2
Ec 840 ppm
Fed every three days about 1.5 litre
Nutrients are mixed in res as follow in 200 litres

Cal mag 90 ml
Terra grow 350ml
Silicon. 100 ml
Katana Roots 50 ml
Superthrive. 40 drops

Room humidity 70%
Temps. 22-25 celsius

Decent air flow ( three wall Fans )
Decent air extraction( 10" extractractor fan)

I hope i have covered all details.
Why will only effect three plants out of so many , if the issue is nutrient lockout or over watering.

 

[buzz66]

The only thing I can think of is possible to much water...let them get to 50% pot weight before feeding them and treat with Fongarid or something similar in case the roots have issues. Soil grows are notoriously hard to diagnose when you have issues.
If all of them are curly over and droopy then more than likely overwatering

 

[Seed collector]

The only thing I can think of is possible to much water...let them get to 50% pot weight before feeding them and treat with Fongarid or something similar in case the roots have issues. Soil grows are notoriously hard to diagnose when you have issues.
If all of them are curly over and droopy then more than likely overwatering

Thank you

 

[STILLSMOKIN]

I agree overwatered. But also are you running a fan? When leaves touch they will sweat and make those marks.

 

[Seed collector]

I agree overwatered. But also are you running a fan? When leaves touch they will sweat and make those marks.

Thank you,

Yh I have fans, are you saying a lot of air flow isn't good? Or u meant less airflow could be the cause?

When I water plants with spray pipe some times its drips on leaf, do u think water with nutrients on top of leaf could make them burn under light.

 

[Seed collector]

Thank you,

Yh I have fans, are you saying a lot of air flow isn't good? Or u meant less airflow could be the cause?

I personally thought it was nutrient burn.

When I water plants with spray pipe some times its drips on leaf, do u think water with nutrients on top of leaf could make them burn under light.

 

[STILLSMOKIN]

Yeah try not to get water on leaves. But fans are fine just make sure it gets fresh air also.

 

[buzz66]

Only time you can have to much airflow is when it too cold or the humidity is very low and they are in Veg, otherwise the more air the better.
And yes spilling Nute's on the leaves during watering will burn them