Really dumb question.

[diskokobaja]

Me dumb as i can be ,i' am using ph perfect line, and dont ask me why,couriousity had to checked with my ph pen, it show me that ph is 7.5 and i went and lower it with ph down...
I think its because of that.. I didnt flush em today i just feed her , and now i'm waiting results..

this was taken before watering today..

 

[GoAuto6]

I would flush with 3 times the pot size....

 

[Waira]

disko-- Have those pH pens been calibrated? If not, their readings may be off, and it's hard to give proper advise with uncertain info, especially pH! .... Iron is the first thing to lock out at that pH, but I'm not sure I see the right symptoms,... might be some Mg defc. happening,...

 

[epenguin]

It is no good to have a ph pen if it is not calibrated correctly. I know I am stating the obvious but you would be amazed how many people trust the pen without ever calibrating with some right on solution.

Happy growing my good chums........eP.

 

[diskokobaja]

@GoAuto6 i will monitor them to see if yellowing and some necrosis continues, i know you can see clearly from the pics, but for exsample on one plant its just one bud affected other are normal, on one or two there is no def except fan leafs.. So if sh*t continues i will flush them on next sunday...
@Waira yes and no.. I have buffer 7 liquid and I calibrate them with that, but my pens are fck up.. After calibration pens are showing same measurments , but when i tried few water sources the reading were funny, i calibrated them again and put them it tap water, they showed 7.0.. I keep them in my glass with tap water, i think probes are fck up coz my water i s really hard and you get limestone (if i wrote right word9) on everything pretty fast..
The question is if only last feedin was ph off, is flush a must or this right ph feeding will solve the problems?

 

[diskokobaja]

@epenguin the girls are in 8th week , they were in pre fert bought soil getting only water for first 3,5 weeks,then i started feeding with 1/4 of reccomended dose AN, Im using Ph perfect line and i never messed with it until i suddenly got the eager to check ph when aded AN ,that was 7 days before..my reading were 7.5 and i added ph down and fed them, from then yellowing started on non fan leafs...

 

[Waira]

... okay, how are you testing the soil pH, using run-off? that's a generally lousy way to do it, because it's a method that's prone to several sources of measurement error,.. here's a link to an improved method-- https://www.autoflower.org/threads/...-for-run-off-testing-and-ph-estimation.41733/

...follow direction and calculation carefully mate! .... the hard water is likely what's behind the high pH disko,... and if you tried to measure pH of RO or distilled water, it probably came out confusing-- this is normal, part of the water chemistry that pure water has, and how the pH meter works,... If you flush, use water that's been made with your tap and RO/DI, to greatly reduce hardness, but not pure RO/DI, that can have issues as well,.. make a 1/3-2/3 blend of tap and RO/ DI,... any chance you have a TDS meter?-- total dissolved solids... this will tell you just how hard the water is, with dissolved minerals (mainly CaCO3-- yes, limestone )... this is what gives water pH buffering capacity, which in RO/DI is missing, so trying to pH pure waters is nuts, as even tiny inputs will have big changes in pH! ... your AN nutes will buffer themeselves in solution, but less hard water will help, as the nutes can only do so much, and might be overwhelmed by the hardness... once in soil, these nutes do not buffer the soil as well! It just doesn't work that way in soil,... I recommend a micronutrient supplement, with Fe, Zn, Mn, etc. in it, just to be sure,.. remember, flushing will strip away most everything, which is why in the final pour through, you add back a mild nute solution,... better still, a foliar spray of micronute's will speed thing in there fastest... do you have a wetting agent? this is critical to effective foliar spraying,...

 

[derek420colorado]

You know I am just going to stop lol everytime I read through a thread and I have an idea of what is the issue I read through and sure enough @Waira has nailed exactly what I was thinking.

 

[diskokobaja]

@Waira i dont measure runoff.. i know (from measuring with new brand opet valibrated ph pen) that my tap is 8.6.. i was calibrate them in only 7.0 solution (solution not salt) and thgen checked in my tap water.. they showed 7.5.. Then i put them back to solution, washed them and again in new tapo waterit showed 7.0... Than i got pissed of power them off, and left them in tap water until tommorow, after 24h they were showing that my water is 8.6.. later i was checking again my tap water and reading were again off..so i gave up on them..I have tds pen but i think it needs calibration to.. I mneam many people on my domestic forums use tap water aslo some arent even using ph down or ph pens coz their ph is under 8.0 and dont get any problems.. I usualy left my tap water for 24/h and i put air stone to get little airy.. Only question i got for you is should i wait to soil completly dries or can should i flush it tommorow?

 

[Waira]

well, the problem is, if you flush with your hard tap water, and you have soil pH too high already, the flush will not help bring the soil pH down, and stop the lockout,..IF that's the problem, and without a proper pH reading, even from the run-off method, it's hard to say what the right course of action to take is,... use your best pH pen, and run that test I linked you too,...