Grow Mediums WoS Automatic Afghan Kush Ryder - Week 3 - leaf problems on one of the babies!

[MadDoctor]

Hello, as the title says, I'm growing a few AAKR from WoS.
The plants just entered their 3rd week under the lights, and one of them is showing some light green discoloration on the new leafs and also some curling up of some leafs borders.


What could it be?

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Her sister in the same pot, same irrigation tank and schedule, does not seem to have the same problem:


The light is a 400w MH bulb on a digital ballast, will switch to an Agro lamp as soon as they show some signs of flowering.
I'm using Atami A+B at 2ml/L, Atazyme, ATA Clean, and some Fulvic Acid and Kelp extract.
The plants were also sprayed with Triachontanol 1ppm 2 times, once the day before the pics were taken and once the week before.

 

[MadDoctor]

Bump! Anybody?

 

[namvet25]

They don't look that bad to me but ill have this moved to the hydro secfor a better response.

 

[Wienerwoods]

Hi there! My AKR is experiencing the same kind of issue right now. She's just a tad more pale and yellowish than yours.

My best bet is nitrogen deficiency. Maybe give her some N (micro and maybe grow nutrients) and see how she reacts. I did that to mine and I'm going to check on her tomorrow. There's a chance it has all been flushed away by the rain but I will let you know if it helped.

 

[Muddy]

I'm a little confused. Are you growing in soil using drip irrigation? They look like they are just hungry but more details would be helpful. What soil are you using, what is the pH of your feed nutrients? The leaf curling is usually caused by heat stress. How high above the plants is your light and what is the temperature and relative humidity measured at the top of the plant?

 

[steelrat]

What Muddy said, confused about soil under your net pot filled with pebbles ?

I say N-def, if not hydro then what soil ? The soil doesn't look good, looks like supermarket compost.


Cheers,

steely