A report was produced in 2011 on the carbon footprint of three fertilisers used in New Zealand with support from MAF and Zespri. It was recently updated by AgResearch with support from the Fertiliser Association of New Zealand.
Original report on carbon footprint of NZ fertilisers (Zonderland-Thomassen, Boys and Ledgard, 2011) available here.
Updated report on carbon footprint of NZ fertilisers (Ledgard and Falconer, 2019) available here.