Need Ur Help W/ Mid-4th Week Flower Deficiency Diagnosis (Help!)

I am currently in mid F4 running Cherry Pie, Grape Ape, And Cherry kush In Happy Frog Soil 2.5 Gal Smart Pots Running 8-750w hps lights 18 inches @ 10-11 plants per Kiddie Pool , 20-22 Per Tray(8 lights / 8 Pools).My Temps are kinda High for flower at about 77 daytime and 73 Nighttime temps. ran same Strains last time and it seems to be lagging a bit this time... On top of that It had same burning last time but not till much later (around f7) , but plant size was smaller as it was colder and all strains seemed to stretch a bit this time. Humidity stays around 50-55, and bud size is smaller so far but may have lagged a week In Veg due to dixie cup transplant I did this time.I am having leaf tip burn and Leaf tip Necrosis,Slight Necrotic Spots, As well as Leaf tips curling Upward as they dry out and become bumpy & "rusty looking" at tips.also they are yellowing faster in light hot spots in the middle then on the outer rim and not sure if its just faster maturation or a deficiency from using more nutes from intense sunlight.any feedback would be much appreciated as I am getting sketch ballz about the next few weeks and what to do next...

P.S. This Deficiency or whatever Ruined My Last Crop Of Cherry Pie, Still gets you lit but tastes like crap even after proper flush...

By the way, majority of probs are happening with the authentic cherry pie, and cherry kush, not as much on grape ape strain..

Looks like over fertilization and to close to the lights Temps really aren't that high seen alot worst, also what kind of air circulation do u have in your canopy??? Recommend moving the lights up a little and flushing vey well and start over with fresh nutes about 1/3 less strength!!! Should help within a couple days

thnx for the imput killer, I'll give that a try and I'm thinking you may be right.

I have fairly good fan circulation (about 4 fans set around perimeter) and a 10 inch intake pumping fresh air from under house w inline ducting.

I must admit i'm no expert on nutes & deficiencies, but the only 1 thing i thought of that may help u is to ask how well u filter your water & if u leave it to stand for 24hours before giving it to your plants?? If not, i'd recommend trying that as it could be something chemically in the water (like chlorine, fluorine, etc) possibly causing it.

Otherwise, i'm afraid i'm all outta tips except for agreeing with what Killer said - normally if i get some sorta deficiency that i can't sort then i just flush heavily & recommence feeding a few days later at a much lower dosage. It never brings the affected leaves back to life but always seems to allow the plant to carry on till harvest ok.

And best of luck sorting it dude as gotta say that looks a very sweet Scrog grow indeed!

thnx man, daps to redwhitebluegreen & Killercross420, I do usually forget to let res breath after filling , got R/o but have heard that this doesn't efectively eliminate Chlorine residue as well as other trace elements and letting res breathe lets chlorine escape after about 16 hours,I always forget to refill till the watering deed is about to be done, So I will definetly add that to my to do list .
Respect!

dude.. try adding some black strap molasses and epsom salts (teaspoon to gallon of water). . it looks like Potassium deficient and possible mag


look at the pics on the link for both..

https://www.rollitup.org/marijuana-plant-problems/488004-guide-nutrient-deficiency-toxicity.html

Yeah, the burn is mostly on the new growth which leads me to believe you are getting lockout or some deficiency. If it was nute burn, the older leaves would be burning the most and curling down not up.

78 is optimum temp so you aren't running it hot.

thnx you guys, Ima give that a try and ill post results, How Do I combat Lockout, With a flush maby? Just fluhed, I'll try beefing up potassium and magnesium, My Ph meter was acting screwy for about hallf a week and I didn't notice I was adding crazy amounts of acid to regiment, like below 5.0 . I was wondering if maby this was contributing to lockout? Got ph test liquid now so I'm back in action, but can't tell if burns getting worse or staying the same cause necrosis can't heal,maby I should trim leaves a bit... Could It be some kind of leaf disease?

yeah flush until the water coming out the bottom is clear but at that point you've flushed all nutes out of the soil so you have to start the nute process again..

if you want to control the ph ..flushing with distilled water will lower it