Issues with few plants in veg

[Waira]

...each pot is own little "ecosystem", with several things going on in each pot that can affect pH,... What goes in doens't reflect what the in-pot pH may be;.... symptoms look like a transitory P defc, like I see in hydro sometimes.. is it spreading?
get us more pics, whole plant, in normal light please, this helps with diagnostics...
....how are they watered/fed, drip system? That's a pretty rich feed solution as is, but plant size is a factor,... so is how saturated the medium is all the time,...

 

[Seed collector]

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

Thank you , will consider your advice.

 

[EvilScotsman]

Yeah looks like nute splash/sweat marks to me aswell.
As a general rule for quick diagnosis.
Leaves curl up is environmental stress. Lights, heat, rh or wind.
Leaves curl down is something to do with the roots. Usually not enough oxygen/drainage.
Leaves go twisty like that is a ph issue.
I'm not familiar with pro mix but check what ph the run of is and find someone who uses that soil to see what It should be. Sure it's meant to be closer to 7 but I'm a hydro grower so can't say for sure. Defo looks like ph to me though.

 

[papykush]

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.

 

[papykush]

too much fussing with the nutrient, h2o ..... i use biobizz light also ... i go 1/4 strength ...no problems ...here deez nuggs 4 weeks.. floralicious plus....floranova bloom

 

[EvilScotsman]

too much fussing with the nutrient, h2o ..... i use biobizz light also ... i go 1/4 strength ...no problems ...here deez nuggs 4 weeks.. floralicious plus....floranova bloom

"Quarter strength" is generally 400-500ppm depending.
I've just done an experiment to see if you can feed 400ppm from 5 day old seedling to bloom in coco and it turns out you can. With absolutely zero issues whatsoever. Just feed em that and don't touch em.
Ideally suited to sog,plants of 5oz or less I'd say.
I averaged 3-4.
I also done a 200ml pot sxperiment though and fed that a litre a day too and she was fine all the way.
Only got 2g which has been curing in its own wee jar for 4 or 5 weeks now but she was an awesome wee plant. Exactly what I wanted