New growth yellowing between veins, AFTER feeding. Need help!

[DTOM420]

I am far from expert, but I presume you couldn't go wrong continuing to feed regularly, or even more frequently for a bit, making sure to do a good amount of drain-to-waste (excess run-off) each time. That is, keep the contents of the pot fresh.

And if not already, you couldn't go wrong adding a beneficial microbe product or tea.

Don’t you think that I should wait a few days before watering/feeding again since I drain to waste fed yesterday? I mean, give the soil a chance to dry some before doing it again? Would you agree that I should feed the next round with my high pH well water (un-pHed) to try and compensate for the apparently acidified soil?

I’m considering a foliar feed with 1/4 strength (or lower) nutes. What do you think? That ought to help her get some nutes without adding additional water to the roots. I just worry about drowning the roots and getting something like root rot or fungus gnats from keeping the soil wet, without a dryout period.

 

[Waira]

...do you know what the ppm and hardness is in that well water? Haven't we talked about this before... ... it looks like a micronutrient defc., Zn or Fe,...
..wait, why are you giving these plants hard core bloom boosters now? BE is hot stuff, lots of P and very K heavy too... stop using this now, it likely causing a lockout from excess/toxicity...

 

[DTOM420]

...do you know what the ppm and hardness is in that well water? Haven't we talked about this before... ... it looks like a micronutrient defc., Zn or Fe,...
..wait, why are you giving these plants hard core bloom boosters now? BE is hot stuff, lots of P and very K heavy too... stop using this now, it likely causing a lockout from excess/toxicity...

@Waira - I misspoke about the bloom nutes. This happened after MC and CalMag only and sometimes a mild organic general nutrient I use with all my plants - locally made 6-12-6. I am feeding bloom nutes to some autos in with her but she is only getting MC alternated with a mild organic nute mixture. Good catch! I corrected my original post.

Yes, we’ve talked about my well water before. It’s about 980ppm and only mildly hard. However, I was feeding rainwater I was catching when this issue actually arose. I don’t see this as an issue with my water because none of my other 14 plants is having this issue. Not yet, anyway.

Did you read my post about the crazy low pH of the runoff from this ONE pot? I put in 6.6 and got 5.6 runoff! I think THAT is the cause of the problem. What do you think? I don’t understand how that one bag is suddenly so acidic? My only guess is that I must have accidentally double dosed a batch of well water or rainwater with pH Down (back before the problem started) and acidified the medium. Wouldn’t that explain the symptoms as well as the runoff results and the cause of lockout? How do I fix that - feeding with more alkaline water until the runoff balances?

 

[BII]

Don’t you think that I should wait a few days before watering/feeding again since I drain to waste fed yesterday? I mean, give the soil a chance to dry some before doing it again? Would you agree that I should feed the next round with my high pH well water (un-pHed) to try and compensate for the apparently acidified soil?
.

Sorry, can't help regarding watering. I'm spoiled from using coco/perlite. To me, if you are concerned about drowning your roots, if you can't regularly feed until some excess drains off, something is wrong. if your soil is too dense, you could have inadequate drainage and low air exchange at the roots, potentially causing rot and off pH.

Regarding feeding using high mixed salts-containing well water, that may only make things worse. Why not use better water with a pH-adjustment product that will be formulated/stabilized to be less disruptive.

 

[Waira]

wait, what?? 980ppm is beyond hard mate, like 3x over what's considered hard,... did you have a lab analyze your water before? Do you know how much of that is CaCO3 hardness? how much of this water has been used before going to rainwater? ... rainwater is great, but the well water concerns me greatly, depending on the chemical analysis results,.. that's an enormous amount of dissolves solids man, whatever it is,... ion load is ion load when it comes to nutrient uptake and if that gets out of whack, all kinds of problem can start, and none of it fixable by adjusting nutes, this is an elimination issue to remove /reduce the load going in,... and deal with pH!
that run-off does indicate a badly off pH pot,... and that can happen at any time, each pot is it's own little ecosphere, a lot of pH influencing factors in-pot,...

.. badly off pH pot may need flushing with low ppm water, adjusted to 7.0.
... these symptoms are looking like Fe and Zn defc.... if the pots are truly acidi, then this isn't a pH lockout issue, it either a simple lack-of, or pending what you say about the use of well water and the ppm value of it, it could be a different type of lockout relating to that comment about ion load in there,.. it screws with uptake all around and/or either from competitive interference or osmotic gradient reversal (too much shit in the soil making it more "salty" than the plants itself, so water wants to out of the plant, not into it)....
the A8 unit should be used with well moistened soil, not saturated, and definitely not dry... this will give inaccurate readings,.... BTW you can't take readings right or recently after you have fed them, that laters the pH... take readings a day after feeding,...