Roy Bailey writes

That's the stuff. Ammonium sulphamate, also marketed as Deep Root and
Amcide.

But searches via Google seem to suggest that it was withdrawn from use
nearly a year ago, thanks to interference from the European Union,

.... because the company decided not to submit a data package to the EC
Review - possibly because sales are not sufficient for the company to
feel it was worthwhile providing the data package.



--
Kay