Need Your Advise Please - My Girls are looking yellow!

these girls are 3 weeks from seeds, some of them are looking vey yellow now, i was told is due
to too much Nitrogen so I cut down on the normal dosage. some of them looking alright but it seems
the yellowing problem now is spreading .

is it too much light? or is it sever lack of Nitrogen? I greatly appreciate any advise to help them recover before is too late?

Many thanks

Room temp: 17c Night - 21- 23 at Day
Room Hum: 40 - 50
Light : 3 x 600 HSP
Distance from girls: 12 inch
PH: 5.8 - 6.1
Food is : 1.5 ( for the last 10 days )

dude those plants need nutes bad, especially nitrogen. what nutes are you using??????????

cheers
mr.bond

smokeydart said:

these girls are 3 weeks from seeds, some of them are looking vey yellow now, i was told is due
to too much Nitrogen so I cut down on the normal dosage. some of them looking alright but it seems
the yellowing problem now is spreading .

is it too much light? or is it sever lack of Nitrogen? I greatly appreciate any advise to help them recover before is too late?

Many thanks

Room temp: 17c Night - 21- 23 at Day
Room Hum: 40 - 50
Light : 3 x 600 HSP
Distance from girls: 12 inch
PH: 5.8 - 6.1
Food is : 1.5 ( for the last 10 days )

Click to expand...

What kind of soil or medium is that? Something is really off herre. At that size they should JUST be requiring some food, maybe 1/8 or 1/4 strength. I don't know what food 1.5 means?

Guys many thanks for your speedy replies
They are in Coco (Canna Coco Professional Plus) + I am using Canadian Express Nut
They Nut mix consists of : Grow , Regen A Root , Wilt Guard , Nitrogen , Bio balancer. I use a EC meter and EC stands at 1.50 - 1.52 but following mates advice I cut down on Nit,
despite all googling shows lack of Nit. for these type of symptoms. but mr.bond you suggest these babies need a dash of Nit ( not over doing it of course ).
My other question is it due to too much light / intensity of light ? I am keeping the PH between 5.8 - 6.1 is this ideal at these stage or is it too acidic for them ?

Many thanks folks.

Peace.

It may very well be the light. It looks like you have the light at 18" and that's pretty low for seedlings. I would reorganize those plants so that the larger ones are under lower lights and the smaller ones under the lights @ 3 feet.

In this scenario I would go with a combo approach because your issue seems odd.

I would water with plain phed water on a few plants, and feed with MUCH less nutrients on the other.

At that size an EC of 1.5 is INSANE. The equivalent PPM is over 1000. They should be @ an EC of .2 at the high end. So with a few I would cut the nutrients to .1 and bump them to .2 after a week. Each week raise the EC by .1 unti lthey reach full maturity and are at an EC somewhere around 1.5 - 2.0 depending upon the strain. You likely wouldn't hit that strength until mid flowering.

Treat your seedlings like little babies, not full grown plants.