Help - Is this nitrogen deficiency?

[Mac Lean]

Hi, guys!
This is my first grow. I went for a Vertigo autoflowering from Paradise Seeds in Miracle Gro Potting Mix Root Boosting Compost (yes, I know most growers hate Miracle Gro), which is supposed to feed the plants for 3 months.
This baby is only 22 days since it broke the soil, so I'm not sure if it's a nutrient deficiency.
Been using only water, since I thought the soil was already nute locked.
Anyway, hope the information provided helps you guys to try and figure what's wrong with my plant, she's a 22 day old autoflower, which means it should start flowering in about a week or so...

PS: I'm using a 250w HPS.


HERE ARE SOME PHOTOS:

 

[Stealthboat]

I think it's just the younger leaves dying off. At the same point where the yellow leaves are you can also see a bunch of new little green growth. I'd just pluck those leaves once they are over 50% yellow, just my opinion though, I have no experience with auto's

 

[Mac Lean]

I think it's just the younger leaves dying off. At the same point where the yellow leaves are you can also see a bunch of new little green growth. I'd just pluck those leaves once they are over 50% yellow, just my opinion though, I have no experience with auto's

So is it normal for leaves to just die off like that without it being an indicator of any big problems?
Thanks for your reply!

 

[Stealthboat]

Yup its normal, if you check out the first couple pics in my current journal you will see some pretty yellow leaves lol

 

[Mac Lean]

Thanks, dude!
It's my first grow so I was already freaking out... LOL

 

[Stealthboat]

Haha happens to all of us. Just keep a close eye on stuff and report problems here, things will get worked out

 

[Rubby813]

Hi
Check out my thread " progress first grow.
Was having similar problem. Used vigor potting soil to plant and mixed in osmocote. Soil too hot, leaves yellowed, growth slowed. What I did was to transplant to larger pot with good organic soil( losing as much soil as would easily come off roots) and then wAtering with water and 50% mix of flushing agent. Plant is growing now and looking much better. No nutes added since transplant.
Good luck hope this helps

 

[Mac Lean]

Thanks for replying, Rubby813!
But I think my leaves look different than yours, they don't seem nute burned, the yellowing on them is more like what I saw when researching for N deficiencies...