Various urease inhibitors (UIs) have been used over the last 30 years to reduce ammonia (NH3) losses via volatilisation. Among these, N-(n-butyl) thiophosphoric triamide (nBTPT), sold under the trade name Agrotain®, is currently used in New Zealand.
Easily recognisable product brand names which include nBTPT which are available to New Zealand farmers are SustaiN and N-Protect.
The effects of Urease Inhibitors were included in Overseer with the release of Version 6.3.2 release notes for which can be found here
The methodology for the inclusion of Urease Inhibitors was developed for Overseer by AgResearch and agreed to following an online science discussion. The implemented methodology is attached below