young plant with yellowing new growth

[heffer]

Hello all i am new to this forum and new to auto's, and this is my first run with them. I am using happy frog potting soil, 400w MH and Grow panel 300 LED temp is 78 and humidiy is 67% but raining today. my babies are only two weeks old and the new leaves on them are yellow. i have not added any nutes to the soil yet was going to wait another week or two till they got just a little bigger figured the soil would provide enough until them. I will post a pic when i get home. Any suggestions?

 

[The Squid]

Welcome to the farm heffer. Being that early it could be a nitrogen deficiency. I'm no expert and it's hard to say without more info. Pics will help for sure, you said you're doing that soon.
Also, what is your ph of the water that you've been feeding them and what is the ph of the runoff water as well?
This will help us narrow something down for you. later dude

 

[surffreak23]

Squid has some good questions and comments that, if answered, should solve the problem. What brand/type of soil are you using? Can you take a pic of the NPK ratio on the bag?

 

[The Squid]

Hey thanks surffreak. He says he is using Happy Frog potting soil. Not sure if there is more than one kind or the NPK though. But I just noticed that is what he is using too. haha

 

[surffreak23]

Ooops read right past it somehow lol....

 

[surffreak23]

As I can't see the Happy frog running out of juice yet, I would look first at PH for the lock out of nitrogen and other nutes...

And of course pics would help enormously!


:smokebuds:

 

[The Squid]

No problemo sir. And you're right. I threw that out but then thought about ph. It's almost always ph. haha. Getting a hang of just how important it is really. Pics and ph and we should be good.

 

[heffer]

Ok also came across another problem. my thermometer is busted put a new one in and found out it is 90 degrees in my tent. oipened it up and dropped temp down to 80 but would heat stress cause this type of yellowing? Also Ph is 6.8 and runoff is 6.9. hopes this helps. Was also wondering if i introduced CO2 into my tent would that help them tolorate the high temps?

 

[The Squid]

That is too hot for sure. How long has it been like at that temp?
Not sure if heat stress causes yellowing though.
Ph seems a bit high but I believe that is ok. Someone else will back me up. Stick in there.

 

[surffreak23]

The heat shouldn't be a problem that shows itself as yellow leaves, more likely it would be shrivel/droop city with crunchy leaves... I grew some LR2 from start to finish in 90 + degree heat with no readable humidity most of the time, and they came out fine, just slightly smaller than normal....