Qualityguppies;46462 said:My PO4 came in at 9.0 ppm today after only dosing Mono Potassium Phosphate and Potassium Nitrate on Monday and then today. My trace or CSM+B Plantex was dosed yesterday. Does that mean I should cut down on my Mono Potassium Phosphate ( KH2PO4)?
I am new to fertilization and testing and I am trying to figure this stuff out.
Philosophos;46468 said:Ya, I've used the API ones and they're semi-accurate. Be sure to calibrate.
9ppm is no big deal. If you crunch the numbers for EI dosing regimes, some of them even dump in 11ppm at a time.
Tug;46493 said:Calibrate your test kit before you base anything on what the reading is. Until then, all you can determine is a change in PO4 levels (level went up or down), not an actual reading to be trusted as accurate. I believe Philosophos has already mentioned that 11ppm has no ill affect so worrying more about the accuracy of your test kit would be a better use of your time. Calibrate your test kits or stop using them.
Here is a thread by Hoppy off TPT for calibrating test kits.
✒ Calibrating Test Kits - Hoppy
There is even more information around here if you search for it.
I rewrote the calibration ‘how to’ a while back to make it easier. It is at the end of the link above and here below too. I'm just trying to contribute to this thread a bit.Tug;46501 said:Thanks Philosophos,
There is this - http://www.barrreport.com/showthrea...d-PO4-reference-solutions(repost-from-Left-C) I finally got some scales for weight measurements rather than volume, but I like the KISS of the original post for us beginners.
It sounds kind of like, "Just say no." and we all know how that can turn out. This should have been a PM, but I'm feeling a little pissy.Biollante;46499 said:Do not test, stop it do not worry about calibration. You do not have the experience to relate any of the readings to the real world.
I agree Biollante, but the way you and others come to that realization is to what? Use serious test equipment.Biollante said:These days I have serious test equipment and a couple of serious people to aid me. The more I test the more I realize how rare it is to need the test equipment for ‘troubleshooting’ purposes.
Because of the condescending attitude, because it was a flip remark and because I've been snowed in all week from this snow storm you old gas bag (kidding).Biollante said:Quite why anyone should be so offended or become “Pissy” over my advice, I even agreed and positively said “What Dan and Tug are telling you is great.” Why should that offend you?
Ignorance is bliss - said one lemming to the other.Biollante said:Just say “no,” works every time it is tried.