Iron and nitrogen deficiency.. Right?

[xMaYHeM]

Hey guys, sorry for a long post but I've got 3 plants and 3 different problems! I hope y'all are having a beautiful day/night wherever you are.
Anyway introducing the ladies:

World of seeds Wild Thailand (big plant black pot in photos)
13.5L pot canna Terra pro +40% perlite
Vegged for approx 6 weeks under 24/0
now on day 6 of 12/12
Soil PH of 5.2..... (Woops)

Random bag seed (small plant black pot)
4.5L pot (gonna transplant today) canna Terra pro
Vegged for about 3 weeks
Now day 6 of flower
Soil PH of 6 (acceptable)

Andromina (big plant orange pot)
In a 13.5L pot canna Terra pro +40% perlite
Vegged for around 5 weeks
Now day 6 of flower
Soil PH of 6.2 (pretty good, right?)

Temps are around 23-26 lights on and 19-21 lights off
600W hps light
Closet with white walls
Fan on low setting while lights on blowing on plants
Ventilation on whilst lights on

So I just checked my wild Thailand's PH level with my shitty soil stick meter thing and it was 5.2 after a watering. Obviously this is far too low and I am going to raise it with some ph up next watering.
I believe it caused an iron deficiency because check out the yellowing on those leaves... They're a vibrant yellow it's crazy (big plant in black pot).
I added the following: trace elements 1/5 strength to add iron and zinc, 0/2/14 potassium mix 1/3 strength but I'm scared that once I raise the ph it will take up too much iron.
Should I flush it with PH corrected water or should it be fine if I just don't add any more iron?

My andromina strain is lacking N I think. It's lower and middle leaves are turning pale yellow and dying.
It also had a potassium deficiency last week which I fixed but did not fix the N def. (Big plant in orange lot) I added a slightly diluted version of the nutes I gave the wild Thailand but with a bit of added Miracle Gro max feed which is high in N and K

The little guy in the black pot which is my bag seed strain is a little sick and I'm not quite sure what's up with it. Any ideas?

Thanks guys, it's my second grow and I'm still learning. One day I will be master gardener elite

 

[fandango]

ph some water to 5.8 and flood the pots...clear out the salts and start over...get a tds meter and feed 400ppm until they turn green.
try thr GH flora series 3 bottles.

 

[fandango]

My best plants are in the gh and the maxsea 16-16-16 is all they get for now and the girls are super green

 

[xMaYHeM]

ph some water to 5.8 and flood the pots...clear out the salts and start over...get a tds meter and feed 400ppm until they turn green.
try thr GH flora series 3 bottles.

Sweet yeah I have a tds meter and a better PH meter on the way from eBay
Should be here tomorrow! Keen as a bean to get them looking good again

 

[polishpollack]

dyangro 7-9-5. one half teaspoon in a gallon of water. or the above stuff. your choice.

 

[fandango]

Sweet yeah I have a tds meter and a better PH meter on the way from eBay
Should be here tomorrow! Keen as a bean to get them looking good again

make sure and take a reading from the saucer under the pot and flush until the tds is 100

 

[reddan1981]

how many of them in the 6 ltr or less pots?

 

[xMaYHeM]

make sure and take a reading from the saucer under the pot and flush until the tds is 100

So flush with 5.8 PH clean water (ppm?) And just keep flushing til the run off is 100ppm and 5.8ph?

how many of them in the 6 ltr or less pots?

So both the big ones are in 13.5L pots and the little on is in a 4.5L pot
I got.confused with my bad I'll edit it into the op

 

[fandango]

So flush with 5.8 PH clean water (ppm?) And just keep flushing til the run off is 100ppm and 5.8ph?


So both the big ones are in 13.5L pots and the little on is in a 4.5L pot
I got.confused with my bad I'll edit it into the op

flush with water yes..the lower the ph on the water the more it pulls out of a high ph soil

 

[polishpollack]

if a plant needs fertilizer, flushing isn't something you want to do.

 

[xMaYHeM]

if a plant needs fertilizer, flushing isn't something you want to do.

This is true, should I do a big feed and then flush? Or.just correct the PH of the next watering and hope for the best

 

[Alexander Supertramp]

Looks like they are extremely N deficient and moderately K deficient. They need food, not flushing.

 

[xMaYHeM]

Looks like they are extremely N deficient and moderately K deficient. They need food, not flushing.

Cheers man, that sounds about right. The K def is pretty well fixed at this stage
Plan is to do a moderate N feeding and then switch to flower nutes
Instead of using a tonne of different nutes I think I'm just gonna get the canna range.. Seems much easier than what I've got currently although my wallet is gonna be empty

 

[Alexander Supertramp]

Yep just keep it simple. If you can get in a 2-1-3 range for flower its hard to go wrong. Less really is more. All the high P and K bloom foods on the market in container grown cannabis causes more harm than good.

 

[polishpollack]

dynagro bloom and just follow the instructions on the back. don't fert too much.