Teff Fertilizer Requirements

You folks growing Teff - what are you using for fertilizer inputs beyond nitrogen, i.e. phosphorus and potash? I have soil sample results based on other grasses, but not Teff specific. I know Teff is a low input crop and to much nitrogen can create lodging. Just curious about the balance of the fertilizer inputs. I don't want to waste a pile of $$$'s on fertilizer or put down to little either.

Thanks!
Bill

Teff Fertilizer Requirements