Need help see if you can ID this problem

[yorktown]

What Strain is it? purple og kush
Is it Indica, Sativa ? 60, 40
How Many Plants? 12
Is it in Vegetative or Flowering Stage? flower problem started week 2 of flower pics taken week 6
Indoor.
fake soil pro mix
If Soil... What Size Pot? 7 gal
Size (Wattage) of Light? How Many? 4 1000's HPS XXX hoods
Is it Air Cooled? yes but its winter here
Temperature of Room/Cabinet? high 78 low 70
RH of Room/Cabinet? 35% low 55% high
PH of Medium or Reservoir? 6.78
Any Pests? no
How Often are you Watering? once a day
Type and Strength of Fertilizers used? sensi bloom A and B 10ML/Gal bud Candy, G 10 water is 1100 PPM
Size or Square Footage of Room? 15ft by 15 ft

the problems are below and spread evenly throughout the room. in the middle and bottms of the plant

 

[yorktown]

 

[The303Stoner]

your PH is way high you need to lower it

 

[The303Stoner]

try PH 6

 

[Fuzzy Duck]

Mmm normally in the early stages of flowering P - phosphorus & K - potassium are reasonable common deficiency to occur.

I suspect you will need to increase the PPM to off set any further progress of the deficiency, some other growers may suggest the use of P/K boost supplement whilst in flowering also

 

[yorktown]

try PH 6

My PH has been 6.5

 

[yorktown]

What kind of p/k boost would you recommend ?

 

[Fuzzy Duck]

What kind of p/k boost would you recommend ?

Depends on what part of the world you are from & whats available product wise ?

I use HESI PK 13/14 once a week myself.

Canna do a similar product, Hammerhead is another one Ionic is another brand the list go's on... just have to do a search ya self & see what you find.

 

[The303Stoner]

Bloombastic

 

[Adriot]

I have had the same issue before. I wish I still had pictures of the leaves. As FuzzyDuck has recommended try using a PK boost, but add it slowly over the course of a week or two. Don't want to over do it then create a lockout. There are many products out there, find one you have access to and check if anyone has any experience with it and their results.

 

[KingJohnC]

Your pH is adjusted too high, you want pH 5.8 for hydroponic and soiless (peat moss and coco coir) and pH 6.5 for soil.

here is a nutrient availability chart

here is a cannabis leaf deficiency chart

here is the Cannabis Plant and Pest Problem Solver and the Plant Abuse Chart

Cannabis Plant and Pest Problem Solver - Pictorial

Plant Abuse Chart

 

[yorktown]

picked up humbold countys own crytal burst it is 0-15-15

- watered it 5ml per gal

should this do it or should they get a more potent PK boost

 

[Fuzzy Duck]

picked up humbold countys own crytal burst it is 0-15-15

- watered it 5ml per gal

should this do it or should they get a more potent PK boost

Looks just fine, P/K boost can spike the PPM or EC level so be careful if using it along or with regular nutrients at the same time.

Another chart theirs loads of em out their