400w HPS 4x2 Scrog - Flower

[chowdan]

Well guys heres some images of my current grow.

I've got a 4x2 tent that i setup for a scrog running a 400HPS. Lights a bit hot, however i've got a booster fan drawing cool air from the bedroom into the tent. Bedroom's cooled to 70F via AC while tent is stable at around 75-78.

Overall i think everything looking good. Only two plants, 1 is Exodus Cheese and the other is UW Purple Kush. Apparently Exodus Cheese starts to show purple 4th week of flower, which i have been seeing for the last week.

Tomorrow will be week 4 for my girls. I am noticing the UW plant is starting to turn yellow and not with hold any of the green. Not sure if this is normal, but flush hasn't occurred and everything seems to be in check.

Whatcha guys think?

 

[Nes]

good job dude! props on flowering in the 2x4 under a 400!

I've got a 2x4 but I throw shelves in it with t5s for clones, and sometimes use it as a quarentine tent.

Where is the yellowing on the UW occuring?

 

[HighDesertAz]

Is the yellowing from outer tips of leaves to the inside? Or inside to outside?

3rd to 4th weeks is common to see yellowing due to plants using more phosphorus and potassium. Does your flowering fertilizer have any nitrogen in it?

Do you use cal/mag at all?