PH problems in flowering

[Mario]

I am using 2in1 mechanical pH and moisture tester, I know it aint the most accurate thing, but its all I have at the moment. It shows that the healther plant has 6,3 pH and the other is at 5,5 pH. Idk why theres a difference in pH because the soil is the same in both pots.

So do I only flush the plant that has 5,5 pH soil? What pH water do I flush with ?

 

[Waira]

... well, each pot is it's own little "ecosystem", and can drift off track even if a pot right next to it is fine,... many influencing factors in-pot! And organics are no panacea against off pH once in the pot, despite what all the BS arm-flapping about that is out there,... I see off pH organic fed potted plants all-the-time here,....it's just less likely because of the mildness of them,, but the soil herd plays a huge role in all this!
That probe is dubious, yes, but it's close enough here to confirm the pot is too acidic,.. give it a flush, starting with 2x the pot volume of clear water,.. what's your water source? the pH and hardness are key factors here on determining if you need to adjust it, or add Ca-Mg,... do you have a good pH meter, calibrated and accurate? You'll need to check the pH of the run-off about half way through to see where you're at, and figure when it's enough,... the last pour should have a mild dose of nutes in it, to avoid triggering a potential nute defc. snafu,....

 

[Mario]

I am using water from tap 7.4 pH, I measure the acidity with pocket pH tester pen (10$ from ebay),Its brand new so I assume its calibrated. Dont have the ppm meter.
So should I do the whole flush with 6,5 pH water or do I use plain tap water for the first pours and finish with ph’ed water and a little nutes?

 

[Banjacked]

I am using water from tap 7.4 pH, I measure the acidity with pocket pH tester pen (10$ from ebay),Its brand new so I assume its calibrated. Dont have the ppm meter.
So should I do the whole flush with 6,5 pH water or do I use plain tap water for the first pours and finish with ph’ed water and a little nutes?

Brand new does not mean calibrated, you need the fluid or powders to get a "true" pH test liquid and then you can make sure the pen is calibrated properly.

If it didn't come with the packs of powders, then buy them and make sure.

 

[Mario]

But is it really that necessary because i want to flush asap and if i order some ill have to wait atleast 2 more days.

Brand new does not mean calibrated, you need the fluid or powders to get a "true" pH test liquid and then you can make sure the pen is calibrated properly.

If it didn't come with the packs of powders, then buy them and make sure.

 

[Banjacked]

But is it really that necessary because i want to flush asap and if i order some ill have to wait atleast 2 more days.

It's your choice, but for the future, and I assume you will want to grow more plants, then it's a wise move as there's nothing worse than everything going to hell because something is giving you a false reading.

No idea where you are, but it's possible to get "next day" delivery with some online services, and it's also possible to get the necessary off the shelf at a local garden centre as, obviously, people grow things other than weed and do use these pens so the calibration powders/fluids are more easily available than you think. Might cost more than on the Bay of Fleas, but such certainty can't have a value placed upon it when compared to a total loss from doing something based on guesswork.

 

[Mario]

Hello once again, these girls are 9 weeks old now. Since the last post I flushed them with phed water (ph pen was calibrated), and watered them with biobizz bloom, grow and some cal/mag that I made from epsom salts and calcium nitrate, got the recipe from this thread - https://www.autoflower.org/threads/diy-calmag.57199/
The plant without leaves has lots of yellow pistils, seems like its gonna be harvested sooner than the other girl, soon will arrive a 100x magnifying loupe for inspecting trichomes.
Is there anything I should do at this point?