Greenhouse gas calculators need to estimate the impact of mitigation strategies on individual farm businesses. This project outlines how for rams purchased by commercial farmers with methane breeding vales can be translated into estimated changes in on farm methane emissions.

This report provides a summary of the trends in forage crop and supplementary feed use on New Zealand dairy farms from 1990-91 to 2022-23, with forecast values for 2023-24. In addition to national annual totals, this study estimates the type and quantity of feed eaten in each of the eight New Zealand regions as well as an estimate of the month the supplementary feed is consumed. This report updates the 2019 report by Newman and Davidson.

This study was conducted to determine EF1 values for ammonium sulphate (AS) and diammonium phosphate (DAP) and compare them with the value for urea under the same field conditions, with the aim of providing evidence to assess whether it is feasible to apply the same country-specific EF1 value used for urea when determining the emissions from the NH4+-based N fertilisers in the New Zealand inventory calculations.

Kikuyu grass (Pennisetum clandestinum) is already dominant in pastures during summer and autumn in Northland and other coastal locations in the upper North Island (DairyNZ 2019) and is expected to move further south with the warming climate (Kenny 2001). The objective of this project is to determine pasture botanical and chemical composition, in vitro fermentation characteristics and model animal-level methane emissions and nitrogen excretion of extensively and intensively managed pastures in Northland during summer/autumn. Because of the trends in global warming and their effects on pasture composition in parts of New Zealand, there is a need to characterise kikuyu-based pastures and determine the potential methane emissions of animals fed those pastures.

This report contains a desktop study that compiles relevant empirical observations of the potential effect of plantain and forage rape on soil carbon and CenW simulations using the best available information on the key variables that will affect changes in soil organic carbon (SOC) under different forages.

Content Owner provides Executive Summary Eutrophic Lake Horowhenua is a source of N2O and CH4. When extrapolating our emission data to NZ, we estimate NZ lakes could release 82 kt of N2O and 118 kt of CH4 as CO2eq each year, which is low in comparison to other sectors such as agriculture but not insignificant according to the UNFCCC reporting guidelines.

The purpose of this report is to assess the effects of proposed initiatives and policies on the Emissions Reduction Plan (ERP). We used the version of the New Zealand Forestry and Agricultural Regional Model (NZFARM) that had been parameterised for the agricultural emissions pricing assessment which was completed in 2022 for the Ministry for Primary Industries. The analysis was conducted at national scale to provide insights into the adoption of management practices and technologies to reduce greenhouse gas (GHG) emissions and the corresponding changes in net agricultural revenues, GHG emissions, agricultural production, and land use.

This report provides an update on an earlier assessment of nitrous oxide (N2O) emissions from non-manure organic amendments to agricultural soils, conducted in 2014 (van der Weerden et al. 2014).

The purpose of this project was to take a comprehensive review of stock estimates and assumptions applied to the minor animal categories within the New Zealand national Greenhouse Gas (GHG) inventory methodology.

This report outlines the structure and function of a geneflow sub-model developed for use within the national inventory model.

This document provides a methodology to split the national deer herd between the enterprises of venison and velvet antler production to provide a mechanism to develop appropriate Emissions Intensity Values (EiV) to be applied to venison and velvet antler as two separate products.