CKS Purple kush claw

I've got 4 Purple Kush from crop king seeds. They are in the 4th week of flowering and they are showing signs of nitrogen toxicity. It's my second grow so I'm a bit nervous.

I was feeding heads formula 6-9ml flora series under a 1000w hps. PH 5.8 - 6

Yesterday I did cut back the micro in half to lower nitrogen so now I'm feeding 3-9ml. (I read that purple kush is very N sensitive)

I was wondering if instead of lowering micro if I should use a PK boost and lower overall PPM. Because when i remove half nitrogen i also remove half the calcium! Or the plant doesn't bother for calcium at this stage?

Im feeding 3x 1 min each day wich is about 1.25 gallons total for each plant (I retop reservoir each day with a 5gallons). Each plant got a bit of runoff each watering.

Could it be salt build up? Should I flush with a mild solution of nutriment?

Thank you

you thinking of feeding an N toxicity with some PK eh....
good luck

Flush your roots with lots of plain old motherfucking water, then reduce your N just a little somehow going forward. Don't worry about the other nutes being reduced, or you could switch to a different system. Just take the micro down by half, for now, it will be just fine.
Easily solved.

A sure sign of an n toxicity! I have no experience with hydro, so can't help on how to resolve the matter, but 4 weeks into flower, you dont want an n toxicity, it will certainly delay/obstruct flowering at a critical time!

Thanks for the reply (at least the constructive ones)

I will keep going with the micro cut back at 3-9ml and i'll keep a closer look to they reaction. Next run with this strain i'll cut back micro right after the 2 weeks of stretch.

Forgot to mention, I'm running in Coco. That's why I don't want to flush plain water since doing this will upset the Ca, Mg, K buffer.