advanced grow q - burn or deficiency?

Few different strains going including, super lemon haze, LSD and SweetTooth. Following the fox farms nute schedule 100% with the CalMag added periodically....using fox farms soil (happy frog)

600w hps also..the p.h. is always between 6.3 and 6.8...although I notice the ppm is never in range according to the fox farm feeding schedule
temps flux big time between like 50F (when light is off) and 72-78 when light is on...


All are 9 weeks into flower and all have started to illustrate some problems...I am not smart enough to know if its a deficiency or a burn? please see pix below. Happy to provide more info if needed.

looks more like burn.

flush it

what medium you using, soil? Hydro? how many ml of each ingredient are you using per gallon

fox farms happy frog soil

in terms of ml, I am not sure as I go by tsps...
http://foxfarmfertilizer.com/FoxFarm-Soil-Schedule.pdf
2nd page

Any pics of the whole plant? Nine weeks into flower I wouldn't worry about it too much. Looks like maybe a little nute burn, but I'm going to guess that your plants are pretty far along. I know those haze's can take a long while to flower, I'm not too familliar with other strains.

Some of this looks natural, some looks like burn, some looks like a Cal Mag issue. I really want to see the whole plant, I love bud porn, don't be shy. haha.

I had nearly the identical leave deterioration, but in veg 4th week. My guy that I trust told me it was a bacteria from high reservoir temps. I flushed and cleaned everything (roots included) and started on 1/2 strength nutes. Two days later my ladys were back in full on grow mode. Not sure if your soil or hydro, but something to think about.

thx everyone, going to take pix of the whole plant and will post in a few.

its soil.

my buddy seems to think the "purple" coloration on the leafs' edges ((1st pic) may be a result of phosphorus lock out due to cold temps...lights off temp drops to 45-55F

I have to say... ur ph is probably not what you said. What meter do you have? How do you test it?

To me you have a cornicopia of problems.... Those have a few weeks and may not make it to full maturity.

noooooooo
i use the hana combo meter...p.h. usually between 6 and 7 ...i calibrate often and just purchased a new electrode.
my gut telling me temperature