Week 5 flower can someone help...

Needing help with a situation

Currently running 6 plants in dwc (oxypots)
Half way through week 5 in flower and currently having what looks like to be a deficiency in couple of plants

Using shogun line
Bloom a&b
Active sumo boost
Pk warrior (put in half way through week 4)
Calmag was put in as i thought i had calmag deficiency
Silver bullet (hydrogen peroxide)


Room temps 20/21c lights off & 22-25c lights on
Humidity sitting 55%-60% lights on
Humidity 70% lights off
3 fans keeping air movement constantly
Running 630w led
600w hps
Water temps 18-20c
Ec has been at around 2-2.2 but has gone up to 2.8ec as water levels gone down but topped up back to 1.8/2.0 ec after a day (couldn't get to grow room that day)

PH has been dropping

Lower leaves are yellowing with brown spots and some tips (see pics)

Have read online maybe a potassium deficiency but my nutes have been high end of ec so surely i wouldn't get a deficiency?
Unless it's nutrient lockouts??

I have just topped up all res's, dropped ec range to 1.2-1.6

PH 5.9/6.0

EDIT - after filling them up ^ yesterday, i have gone in today and ph has dropped to 5.5 in some and down to 4.9 in others

Just used ph up to bring them up to 6.2

I don't grow dwc but there's a few things would raise concerns for me.

The temps are too low lights on.
Nutrient ec was probably too high.
It's too early for pk + active sumo boost, it's almost certainly locked out deffo not a deficiency.

I see you've lowered the ec that'll help fwiw id also ditch the pk and any other boosters in favour of base nutrients making up the ec.

Good luck

Star Dog said:

I don't grow dwc but there's a few things would raise concerns for me.

The temps are too low lights on.
Nutrient ec was probably too high.
It's too early for pk + active sumo boost, it's almost certainly locked out deffo not a deficiency.

I see you've lowered the ec that'll help fwiw id also ditch the pk and any other boosters in favour of base nutrients making up the ec.

Good luck

Click to expand...

Shogun says to start sumo boost straight away in flower and pk warrior to be added week 4 of flower

They're getting flushed tomorrow with ph 6.0 plain water for 1 or 2 days and rego again

Something is going on with the ph dropping.. This explains it better than I can..
EC, ph & water levels. What they tell you and how to react.