What deficiency could this be ?

Thats nute burn ,flush then go back tp 800.

Your medium.

Do you plan on growing in that thing for the entire time...Or is that taken out of a hydroponic system.

That doesn't loo like nute burn. That thing looks like its starving.

god knows mate....could be heat stress....ur light sounds a tad bit close for a 600 watter...15 inchs...i keep mine at 2 foot(24)...id check the tutorielas...therres some plant prob pics on there

http://growweedeasy.com/marijuana-symptoms

this should help !!

Can it be heat stress if the probe is above the tops at 72 with the light on mid day ? I feel like they might be starving as well... I flood and drain one time a day for 15 min with my ppms at 1100 right now!! Should i do twice a day? PH is 5.8 in the res but 6.1
in the rockwool cubes!!!

It looks like your plant is deficient of micro nutrients, particularly magnesium, calcium, and molybdenum. Also, the veins of your leaves are greener than the actual leaves, so you probably need more nitrogen too.

Since you're using Floranova bloom, my first question is how much are you shaking that bottle before adding nutrients to your reservoir (or mixing bucket or whatever)? Floranova is rather thick, and you have to shake the hell out if it to get the nutrients into suspension.

And just because your plants may be deficient, doesn't mean to add more nutrients. Those plants don't appear to be ready for 1100ppm. There could be some salt buildup in your rockwool. Maybe you have too much phosphorus and potassium, which can inhibit uptake of micro nutrients. Personally, I'd flush out the rockwool to get rid of any accumulated salts, then give it 600 or so ppm nutrient solution with proper pH...my guess would be that the pH of your rockwool is high, so go with around 5.5 pH. The pH will rise as your plant uses the solution.

I am not a master gardener, so take my advice for what it's worth.

Good luck with your grow!

DontTaxMeBro said:

Your medium.

Do you plan on growing in that thing for the entire time...Or is that taken out of a hydroponic system.

That doesn't loo like nute burn. That thing looks like its starving.

Click to expand...

That's what I was thinking