Iron and Phosphate

[fono555]

Hi,

I'm planning to make a all in one solution and read that phosphate and iron cannot be mixed together because iron can become insoluble and precipitate to iron (III) phosphate.

I decide to make a test and mix CSM+B and KH2PO4 together with RO water and see if there is any reaction in the fertilizer bottle. Right know the mix is done for 48 hours and there is nothing particular that I can see in the fertilizer bottle.

What should I expect to see in the fertilizer bottle if the iron become insoluble? Some particles?


Thanks

 

[Simon Cole]

You'll see a black-brown layer forming on the bottle surface.
Hoagland solution (1933, revised 1950) was the first example of where these fertilisers were used together. Keep bottle dark.

 

[jameson_uk]

You can acidify your solution which should help http://www.theplantedtank.co.uk/allinone.htm