Iron (III)Oxide (rust) as plant fertilizer?

I just want to know what would be the adverse and good effects of these compounds at a smaller concentration in the aquarium. I watched this fish keeper on youtube literally putting rusted nails in his aquarium and I was like, this is crazy, isn't rust dangerous to fish and other organisms?. What I at least found is that higher concentrations of iron (III) oxide could be toxic to fish and an article state that rust can provide iron to plants basically, but I need further clarification and digging on this. Perhaps, has anyone done an experiment by using rusted metals as a source of iron?

 

.. that might be why we used ti dig up nails a lot looking for worms in my grandmas gardens

 

.. that might be why we used ti dig up nails a lot looking for worms in my grandmas gardens

Sorry, I kinda dont understand.. But here what I think at least about your reply.. Are you saying that you were digging nails for worm literally? Can you explain this?

 

Sorry, I kinda dont understand.. But here what I think at least about your reply.. Are you saying that you were digging nails for worm literally? Can you explain this?

I think she means as they were digging in the garden for worms they came across old nails that had been placed there as iron fertilizer.

 

I think she means as they were digging in the garden for worms they came across old nails that had been placed there as iron fertilizer.

Ohhhh I see.. Ok then.. That might be the reason why. , but in my case.. Here in our lawn and garden, I can pick around 1 or 2 kilos of nails lying around hahah..and I know people just leave them there and no purpose at all since people like to leave things on the ground that are not useful anymore.. But they dont like trash, such as plastics and biodegrable materials lying around.

 

It may be usable to plants....if you wait 300 years

 

It may be usable to plants....if you wait 300 years

Eh? Isnt rust already a compound that could provide iron to the plants? What do you mean by 300 years? What would happen after that?

 

Eh? Isnt rust already a compound that could provide iron to the plants? What do you mean by 300 years? What would happen after that?

Iron oxide is not usable by plants for iron... But from my understanding a very tiny amount is chelated iron which is usable.

 

Iron oxide is not usable by plants for iron... But from my understanding a very tiny amount is chelated iron which is usable.

Agree.

 

Plants will most likely use an unmeasurable amount of chelated iron (since there really isn't a lot at all). Intresting question though