Need help with late flowering

[grapeape1972]

Hey hydro growers I need a little help please. Every time a plant gets close to harvest the leaves turning yellow and start dying. I have been using Masterblend @ 2.4,1.2,2.4, Big Bud, Overdrive, TPS Bloom, Flourish Cal +, Garden Friendly Fungicide, Neem Oil, and Miracle Grow not time released... Using 3 1000w equivalent leds, 2 650w Equivalent leds all High PAR..It does get warm in the grower room but the lights are between 12 and 24in from canopy.. Flowering under 12/12, Veg 18/6... any ideas?? Pics at bottom...

 

[ArtfulCodger]

What's the EC in the res/buckets? It's tough to tell without a tighter shot, but they look nute burned at first glance.

 

[hawkman]

Some leaf yellowing is normal --- generally lower leaves -- This yellowing seems to be mid-way and close to top -- only issue could be "heat intensity" or as mentioned a nutrient overload. Maybe poor ventilation -more air movement could be your issue ??? Hoope this helps

 

[grapeape1972]

What's the EC in the res/buckets? It's tough to tell without a tighter shot, but they look nute burned at first glance.

Flowering ones are 2-2.2, the verging ones are 1.1-1.3. Ph 5.7..plenty of air movement.. I'm guessing nute burn..