Abstract

Livestock manure (including excreta deposited during grazing) is a significant source of greenhouse gas emissions, contributing 30-50% of global nitrous oxide emissions from agriculture. Several withincountry studies have focused on estimating nitrous oxide emission factors following the land application of livestock manure and direct deposition of excreta during livestock grazing. ‘Dataman’ is an international project that aims to help refine and understand processes influencing nitrous oxide emission factors from manure by collating manure management data from multiple countries. As part of the initial data analysis, this paper focuses on data from seven developing countries spread across South America, Asia and Africa. Data from published research, theses and conferences were identified by searching different publication platforms for a combination of three keyword categories (type of manure, animal and greenhouse gas). The criteria used for identifying suitable publications were: 1) only one type of manure included in the measurements, 2) trials included a non-amended control and 3) nitrous oxide measurements were made for at least 30 days. Thirty-three studies were included in the data analysis, providing 212 observations. Brazil represented 66% of the collated data, followed by Kenya, China, Zimbabwe, Colombia, Argentina and Nicaragua. Urine was the most common nitrogen source (40% of data) followed by dung, slurry, soli manure and broiler litter. Cattle (beef and dairy) were the most common animal type (68% of data) followed by swine, sheep and poultry. We will present preliminary results from our analysis of the nitrous oxide emission factors.