I think I made a huge mistake.

[Journey Man]

Okay. So... I have been growing since 2013 I think. Always In soil indoors.
I always buy new quality soil every time when I gonna start up. But not this time......??...?
My last grow I started in januari, after a month I had to cut the girls down and toss them of some reason. (Nothing to do with the grow) But I didn't use any nutes in the soil that time, but I always ph'ed the water to around 6.2 - 6.5 when I watered them.
So... since February until 10 days ago the pots have been standing in a cold dark place with the soil inside them...
So I thought I could use the same soil that were in the pots all ready coz I hadn't used that soil for a full grow. It is 15 liters containers.
The thing now Is that the seedlings grow slower and are pale, almost yellow. They are just a week old but I can see that something is not as it should be as I grown this strain multiple times with some IMO good results...

Is there anyone who's a specialist in soil that could give me a hand.
It's either toss or solve the "problem"...

I've got good conditions in the tent... I'm not a first time grower, but maybe I made a BIG mistake by thinking the soil was OK...

@Mossy ?

 

[KonopCh]

After a month there's no nutrients in your soil, if you used lightmix, which has nutrients for 7 days only. That's why are your seedling yellow.

 

[Journey Man]

Normally I start to feed at day 25/26, the soil has a strong ec from start. but as these are seedlings... should that affect them all ready.... I noticed the slower growth almost maybe 3 days ago... is it any way to fix it or should i toss everything and start Over?
Will show you guys some photos.. as photos says a lot more then words....
I've got 2 photos of girls at day 2 above soil in new fresh soil and their color is perfect green.
And some photos of the girls in the old soil......

 

[Journey Man]

Fresh soil... popped up yesterday. Healthy green.

Number 2 fresh soil, popped up yesterday. Nice green, healthy.

And not so green in the old soil.....

Here u can see the difference in green from the one of the ones from fresh soil vs old soil....
The 1 week old ones are much brighter..... almost glowing of them.

What to Do?

The size of the one weeks old are 2 days behind from what they used to be at this stage.

 

[Heavily Medicated]

Have you checked pH of the old soil after sitting around? Just could be the pH swung crazy on you while the soil cooked. If your pH is good in the soil, I think I would add some nutes at about 1/8 strength and monitor. If it is a lack of nutes, you should get almost immediate response. If they don't come around in a couple days, I think I would just start over new.

 

[Journey Man]

Thanks for the reply @Heavily Medicated

Okey... I've got a ph- probe for water.... how would you check the ph in the Soil?
How should I mix the soil with let's say water at 6.2? How much of water and how much of Soil?

 

[Journey Man]

Okey. New soil showed 6.3 when mixed 50/50 with water at 6.4. Wich I assume would be around 6.2 in the soil........ gonna try the old soil now.....

 

[Heavily Medicated]

do you have access to a soil pH probe like an Accurate 8? Way easier than slurry method.

 

[Heavily Medicated]

With slurry method, you should use RO/DI water with low or no ppm and water pH at 7.0. Mix a cup of your soil and a cup of the RO/DI water, mix good and let set for an hour or so. After setting, check the pH of the solution. This should be fairly close to your soil pH. Kind of vague, but better than no way to measure at all.

 

[Journey Man]

With the old soil I get a ph att 6.6 mixed with 6.4 water..... I tried with a lot of dirt....
Let's say it's 6.8..... that's in my world wouldn't be a big problem. I would prefer 6.2 but would 6.8 cause this Problem?
I can try if it's the EC....... should work the same way as ph.....
Ec in my watercontainer after ph'ed and with some root-stimulants 0.48... mixed with "50/50" soil gave 0.57 Ec....
Fresh water Ec of 0.14....... mixed with "50/50" soil gave an ec of 0.5.
I'm not an mathematic but at least 0.7 there should be in the soil....
So there should still be nutrients in the soil... enough for seedlings... Right?

What about to much Light? Using 2 pcs of 600w? Could I have bleached and shocked Them? New reflectors, adjust a wing with new bulbs at I would say 2,5 - 3 feet away...