Fertiliser / Corrosion

[Gadget]

If we were to utilise the split hopper on our drill to apply some fertiliser during Autumn drilling, what would be the best fertiliser to use to reduce the chance of it rotting away? I assume that some sort of nitrogen would need to be involved or could we use Urea?
Wheat preventative measures can we take to preserve the hopper and metering unit?
Thanks
G

 

[Feldspar]

Ammonium sulphate and ammonium nitrate the worst. DAP better. Urea best.

 

[Brisel]

Definitely avoid AN. If nothing else if you leave it in the hopper overnight it will set solid at the first hint of moisture. Evil stuff on metal.

Of course the crop you are planting has a RB209 recommenadtion for autumn starter fertiliser...