girls have turned a pale green almost yellow.....what is wrong

Woofpad

Member
Hi all

Haven't been around a while but plan on being back now. Ok...so I've started these girls on from seedlings. everything was going well. Nice lush green leaves on all of them. Im using 600hps lamps and keeping them at a height of 16 in higher than the tops. The room temp has been a constant 24/5 c during the entire 24/1 lighting schedule. Upon the advice of a friend who apparently knows his onions i switched the lighting schedule to 18/6... i'm a couple of weeks from switching them over to 12/12 .
So at the moment my girls are 7 weeks old. I delayed the 12/12 by a week as in the beginning I was struggling to maintain a steady and healthy room temp. It was 30/31...I replaced the air con unit and now the issue I dont think is a problem.
However I did unfortunately discover an oversight on my behalf. When I switched the light schedule to 18/6 I failed to remember that the air con was pumping the room down to 16c when light off. Now it never actually reached this point according to my record-able meter but it did hit a low of 18c...Then was happening for at-least four days before I noticed a significant change in my girls. They seem to lost out on some colour and are displaying a yellowish pale green finish upon most of the leaves throughout the plant but and I add not all of them.
Im running 6 sq mtres with 6 lamps with ten girls per metre.
Since noticing the change I've sleepless nights lol....wondering what i'm doing wrong. Ive since changed the air con output during lights off to maintain a steady 22c.
I live in a warm climate at this time of year and the fresh air being brought in will be around 27c during lights off. During lights on the fresh air coming in will be a steady 34c. and for this reason my air con is set to 18c to try and maintain a steady indoor temp of 24/5c.
Ive been feeding nukes for three weeks now. The ph after adding them is 6.2 with an ec of 8....

Guys I hope ive given you enough to try explain my concerns....
Photo on its way......
 

Attachments

txponto

Well-Known Member
I don't see the NPK listed on the site but I also have to translate all that spanish. My first guess would either be a slight lack of nitrogen... or the lights are to close and you're getting some bleaching.
 

Woofpad

Member
so you dont think its was the cold temps at night.....
they've three lots of feed now. as the company recommend one feed of NUTES per week...upon there recommendation Im not to add PK BOOSTER until 3 week of flowering
 

Uberknot

Well-Known Member
so you dont think its was the cold temps at night.....
they've three lots of feed now. as the company recommend one feed of NUTES per week...upon there recommendation Im not to add PK BOOSTER until 3 week of flowering

Plenty people grow 60's at night 70's in the day for some reason it looks like they are not getting Nitrogen or something....

Wait a bit let's get some more responses to this cant see the whole plant can you get a better picture?
 
Last edited:

Indacouch

Well-Known Member
They look hungry IMO and in all my years of growing I've never seen or heard of cold temps causing this problem so I'd cross that one off the list .....I would up the N if it were me and cold temps will usually show up on a plant with a purple color on the leaf or stem ....some people do the cold temp thing on purpose to get colors out of there plant that would normally not have any and or make a plant that does have lots of purple do to genetics even more so with cold temps at night .......GL
 

Woofpad

Member
could you explain that formula please.....
the soil is wet ...they were fed 20 hrs ago and each pot had a litre.
Am trying a new watering system where upon the pots sit on a foam matting which remains wet. Then the girls are only fed from the top of pot once a week. Roots are escaping through the bottom of the pots
 
Top