pH vs Nutrient absorption

[zozo]

Found an intresting table at the FB page from RareAquaticPlants.com. 🙂

It shows a table with the relation between the plants absorption of all nutrients at different pH levels.. It came without any backup reference links, so i have no idea about it's validity nor if it's exclusive meant to be for submersed grow forms. But still an interesting subject.. 🙂

Originating source.. In Italiën for those interested, but so far the point taken and doesn't realy need any comments translation.
https://www.facebook.com/photo.php?...&set=gm.1884020358327520&type=3&theater&ifg=1

 

[X3NiTH]

There's multiple variations of this chart out there, I believe it's in relation to soil nutrients at the root zone for terrestrial plants (seeing as water is the transport mechanism it should still correlate with aquaponics), I also beleive the chart is for unchelated nutrients, for instance EDTA chelated traces (not iron) are stable and available to around pH9. If you were using unchelated trace elements like Flourish Trace then this chart would be pertinent as to availability (sulphate based formulation, chloride for the nickel). Still the chart shows optimum pH to be around 5.5 to 7.5 for nutrient availability which is the pH range most folks tanks are at so not much to really worry about. It's still interesting data though and some folks tanks may be outside optimum ranges for nutrient availability and depending how they fertilise trace elements (chelated or unchelated) may have micro deficiencies, always something to consider, if in doubt EDTA. It's the Iron that's a more tricky element with regard to pH, Gluconate, EDTA, DTPA, EDDHA, IDHA, lots of flavours to try depending on the pH. There's not much call for chelated micros (not the iron) to be available in anything but EDTA as the availability range is so broad, the only problem with it is that it accumulates in the environment and is not readily broken down biologically, to avoid this accumulation and still have long term availability biodegradable chelates are needed such as IDHA (something I'd like to try if it was more available).

Better knowing than not!

🙂