Plants stunted and dry leaves week 4 in solocup

[allucards]

Hello everyone. I need a help here please.

It's my first time growing some photoperiod strains (BSF Double cookie and RQS Northen lights.

My plants are in week 4 of "seedling/veg" state, but its looks horrible with huge signs of deficiency or at least some big problem.

I'm using a Marshydro 730w led painel. The painel is 18inch from the plants and the dimmer is set to 35-45% (recommended by marshydro website)
The soil is Carolina Soil 0,7 (in 350ml solo cup)
After the week 2, plants got stunted and not growing anymore. I'm sure it's not overwatering or dry solo. I gave like 1x per week 70ml with only water in ph6,2. The other days i just sprayed water to keep the soil moist.

I heard that carolina soil should have nutrients until week 2 or 3, but the problems started in the beginning of week 2..
Today i gave some nutrients: Advanced Nuttrients GROW part A+B 70ml of each (290ppm, ph6,2, only those two nutrients)

What i can do now? Can i save the plants?

Thanks is advanced and sorry for my bad english.

 

[allucards]

More photos:

 

[Galgrows]

Sorry to see these they look so burnt. I've never run a light that powerful so close to seedlings. I go from 30" away 50% power. Maybe the greener stemmed ones can be saved but the yellow stemmed ones i don't think so. Hopefully you'll get someone else to help. Man that's a shame with so many plants.

 

[allucards]

Sorry to see these they look so burnt. I've never run a light that powerful so close to seedlings. I go from 30" away 50% power. Maybe the greener stemmed ones can be saved but the yellow stemmed ones i don't think so. Hopefully you'll get someone else to help. Man that's a shame with so many plants.

Yes man thats so sad. But in the beginning the light was a bit far with less potency, but the plants started to skretchy so much... then i put like it's now.
Just in case i put the dimmer 30%, lets see the next few days, because i gate some nuts today (first time feeding nuts with this plants).

thank you for the reply

 

[shooter64738]

Those do look a tad burned. You may have to sacrifice one to determine for sure, but this is my rule of thumb.

Start in small cups, as soon as I see lightening/yellowing/not super green on the low leaves, I transplant because they are becoming root bound. At 4 weeks, you're probably getting root bound. If you let one dry up a little(not so dry it's dead) then roll the cup between your hands you can probably pull it up and see if roots are at the cup sides.

Purple stems indicate some excess of light in some strains, but it doesn't mean the plant is going to die. A lot of my adults have had some purple stems. Seedlings with purple stems I generally dim the light a little (or raise it). Weak stems are usually caused by 2 things, no air flow across the plants, not enough light. Air flow makes the stems thicken and firm up, but if there's not enough light, they will still stretch

Right now, I'd look for bound roots if it were me.

 

[Galgrows]

Is there a update on this grow??

 

[allucards]

Those do look a tad burned. You may have to sacrifice one to determine for sure, but this is my rule of thumb.

Start in small cups, as soon as I see lightening/yellowing/not super green on the low leaves, I transplant because they are becoming root bound. At 4 weeks, you're probably getting root bound. If you let one dry up a little(not so dry it's dead) then roll the cup between your hands you can probably pull it up and see if roots are at the cup sides.

Purple stems indicate some excess of light in some strains, but it doesn't mean the plant is going to die. A lot of my adults have had some purple stems. Seedlings with purple stems I generally dim the light a little (or raise it). Weak stems are usually caused by 2 things, no air flow across the plants, not enough light. Air flow makes the stems thicken and firm up, but if there's not enough light, they will still stretch

Right now, I'd look for bound roots if it were me.

Thank you for your reply.

My plants are much better now. I really don't know what happened to get this stunt at the beginning.
What i did: flushed with 300ppm (advanced nutrients base GROW), gave 500ml per solo cup. After few days, all of then came back to live. Now i keep watering after 2~3 days. I'll transplant then this weekend. To 7 liters pot.

Now, i think i gave too much nutrients and the plants is showing signals from nutrient burn if im not wrong. Tomorrow ill give just little bit of nutrients (arround 100ppm). I'll leave some pics here to update this thread:

Is there a update on this grow??

Show man. Photos updated.

 

[voltage]

Thank you for your reply.

My plants are much better now. I really don't know what happened to get this stunt at the beginning.
What i did: flushed with 300ppm (advanced nutrients base GROW), gave 500ml per solo cup. After few days, all of then came back to live. Now i keep watering after 2~3 days. I'll transplant then this weekend. To 7 liters pot.

Now, i think i gave too much nutrients and the plants is showing signals from nutrient burn if im not wrong. Tomorrow ill give just little bit of nutrients (arround 100ppm). I'll leave some pics here to update this thread:

View attachment 2453709View attachment 2453710View attachment 2453711View attachment 2453712



Show man. Photos updated.

Looked like lights were set to high to close to stunt them

 

[allucards]

Looked like lights were set to high to close to stunt them

I'm 100% sure this was not light issue. It's something in the soil i think. In my opinion, too much nutrients. Or at least too much from onr especific nutrient.
But still i did some runoff just with the soil (direct from the original pack) and the ph was 6.9 and ppm 250... But im not sure yet.
I'll germinate more 30 seeds this weekend, but now Will be all auto, from Sweet seeds. Im hoping everything goes ok!