Poor plants turning yellow :\

[pomarXa]

UPDATE

Please ignore the question below. The seedling from these two pictures below is now the biggest and healthiest plant. I am now having problems with two other plants.
Jump to new post below: https://www.icmag.com/ic/showpost.php?p=4348203&postcount=9

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Hello!

Can anyone help me identify the reason for yellowing leaves ?

I'm 100% sure that I'm not overwatering them. I've mixed the soil so that it was moist and I haven't watered them yet.

Here are the pictures:

And more info about my growing:

How long has this problem been going on?
-- 1-2 days

What STRAIN are you growing?
-- Greenhouse Seeds Big Bang

What was the establishing technique? (seed or clone?)
-- seed

What is the age of your plants?
-- about two weeks

How long have they been in the soil mixture they are in now?
-- about ten days, but they have grown from peat pellets

How Tall are the plants?
-- about 11 cm

What PHASE (seedling, vegetative or flower) are the plants in?
-- vegetative

What Technique are you using? (SOG, SCROG etc)
-- nothing in particular yet

What size pots are you using? (Include how many subjects to pot)
-- one plant per pot. I've made pot from cutting the bottle in half (1.5L bottle)

What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?)
-- I'm using soil mixture. The declaration states:
60% peat
30% humus
10% perlite
ph 5-6
200-500 mg/l N
200-500 mg/l P(2)O(5)
300-1000 mg/l K(2)0
100-200 mg/l MgO

What Nutrient's are you using?
-- Nothing yet.

How much of each nutrient are you using with how much water? *Knowing the brand is very helpful*
-- Nothing yet.

How often are you feeding?
-- Didn't feed them yet.

If flowering, when did you switch over to using Bloom nutrients?
-- not flowering yet

What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect)

What is the TDS/EC/PPM of your nutrients used?
-- don't know

What is the pH of the "RUN-OFF"?
-- the declaration of soil mix states: 5-6

What method of pH test was administered? Using Strips? pH pen?
--

How often are you watering?
-- I havent watered them yet. The soil was moist from the beginning.

When was your last feeding and how often are you feeding?
--

What size bulb are you using?
--150w hps

What is the distance to the canopy?
-- enough, about 20 cm (i'm using cooltube)

What is your RH Factor? (Relative Humidity)
-- Depends on the day. At the moment it states 15, but it raises to 30 sometimes.

What is the canopy temperature?
-- depends on the room temperature. Avg is arround 28°C

What is the Day/Night Temp? (Include fluctuation range)
-- 23 to 27°C

What is the current Air Flow? (cfm etc.)
-- I'm not using any carbon filter yet, so air flow is OK.

Tell us about your ventilation, intake exhaust and when its running and not running ?
-- 10 passive 5cm(1.97 in) diamater intakes, and one 12(4.73 in) cm pc fan @ 12V for exhaust.

Is the fan blowing directly at plants?
-- currently there is one fan blowing on the plant

Is the grow substrate constantly wet or moist?
-- The soil was moist from the beginning, and I haven't watered the plantyet. The soil feels dry at the moment.

Is your water HARD or SOFT?
-- not sure about that.

What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water?
-- tap water. I leave the water in plastic bottles.

Are you using water from a water softener?
-- no

Has plant been recently pruned, cloned or pinched?
-- no

Have any pest chemicals been used? If so what and when?
-- no

Are plant's infected with pest's?
-- no

Thanks for your help!

Best regards,
pomarXa

 

[BOZWELL]

it looks hungery, maybe just give it a water with some rizotonic and light seaweed?

 

[Steinawitz]

Water it. The soil looks pretty dry (even out of focus). Overwatering is a concern if the soil stays moist for days/weeks at a time. IMHO, give her some ph'd water, no need for nutes at this early stage.

 

[jacobgriis02]

seaweed or kelp can be used on seedlings i thought? I would even use a mild mix of fish emulsion on those they look like they need it.

 

[BOZWELL]

I used to give my seedling algamic all the time and the loved it,

 

[funkybud]

What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?)
-- I'm using soil mixture. The declaration states:
60% peat
30% humus
10% perlite
ph 5-6
200-500 mg/l N
200-500 mg/l P(2)O(5)
300-1000 mg/l K(2)0
100-200 mg/l MgO

ph too low? maybe raise it some,ph to 6-7?

 

[stoney917]

maybe some bvitamins like b52 superthrive thrivealive will fixem up... i never would give a plants nutes but i mix b52 voodoojuice and rootexcellurator for my cloner and use it to water seedlings and they love the shit ur ph should be higher to esp in soil 6.3-7 is the ballpark ya wanna be in.

 

[cyberwax]

Ill try to make this simple if i can, does you pots have drain holes in them? (if not, do make) if so just water once with a small ammount of nutes, then wait a few days until soil dries up and water with pure water. One time nutes(ph 5.8), one time water(ph preferrable around 6.5 to 8.0, my tapwater has a ph of 8, great way to flush out the excess), and make sure the soil dries up in between. Increase the ammount of nutes as you plant grow. Anything else is just overkill or additives; if successful grow..

Most will argue about this method, because your supposed to use this and that and whatnot, but if your an apprentice pirate you need to make this easy.

 

[pomarXa]

Hello again and thanks for all suggestions.

As it turned out, the problem was the soil. As soon as I've transplanted them in other soil (http://cgi.ebay.fr/COMPO-SANA-30L-Qualitats-Blumenerde-/360080911066)
the problems went away. Everything was ok until one week ago they started to show some curling tips and wierd looking leaves.
I have three plants, the left one is Barneys Farm LSD, and the other two are Big Bangs from GreenHouseSeeds.

As you can see, only those two have the problems.


This one looks all droopy.

And this one has yellow curly tips and some wierd texture on the leaves.

I had some problems with temperature, but that has been fixed.

I am adding nutes as it's stated on this chart:

Does anyone has any idea what is wrong with them ?

 

[intotheunknown]

that seedling is hungry as hell. feed it

 

[pomarXa]

If you're talking about the seedling from the first two pictures, you're now looking at the biggest and healthies plant in my cabinet (first plant from the left on new pictures)