75% coco 25 perlite i had rezy ph at 4.6 or around for probably first two weeks of flower calibrated meter and was out so recalibrated im using bluelab ph meter flowering is not going to bad for now but a lot of leaves getting bad also over fert the run off was well over 2500ppm so i flushed it down to 600 ppm with water then flushed ph 5.9 nutrient mix through to bring run off ph up from 4.6 was thinking locked everything out with low ph hoping anyway i run 1400 ppm all the time thanks for replying renfro ill get photo off whole plant tommorow
Cheers never had this problem before one thing for sure if ya gonna do ph make sure ya do it properly calibrate meters
Chances are that with the low pH feed that your coco has acquired a very low pH. A good soil pH tester like a bluelab would let you see whats going on.
For me it was 6.5 - 6.8 that they liked the most. Definitely hated 6.0 ish...
Is this the ph meter
Truth
Yes sir. Make sure to use the probe cover to poke the hole in the medium, then gently insert the probe to get a reading. Always store the probe with the KCL solution in the cap and don't let it dry out. You can also measure liquid pH with the same pen.
always have a bottle of kcl in your grow its so important u know this but adding on to the point its needed also hows the babies going
I think you are dealing with a pretty significant potassium deficiency.
I watched my coco pH between waterings and I noticed that it would drift down so I fed on the high side and let it drift down through the Goldilocks zone between each feeding, allowing the plant easy access to all nutrients. They loved it. Before that I was watering in the middle of the Goldilocks zone and it would drift too low.
Well low pH or excess nutrients like Calcium or Nitrogen can lockout the Potassium. Do the math on your feed and see what the elemental PPM's are. Know whats there. If there is enough K and too much Ca then you figured it out.
I am used to seeing Goldilocks zone as an astrophysical term but it sure seems to apply here.
