David E. Pelster
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View article: Challenges and Insights for Simulating Nitrous Oxide Emissions in Eastern Canada: Evaluating an Agroecosystem Model Ensemble
Challenges and Insights for Simulating Nitrous Oxide Emissions in Eastern Canada: Evaluating an Agroecosystem Model Ensemble Open
Biogeochemical models continue to be improved in their ability to account for the impacts of agricultural management, soil characteristics, and climate on crop productivity and greenhouse gas emissions. Depending on the model, limitations …
View article: Improved nitrogen fertilizer management practices that reduce growing season nitrous oxide emissions may increase non-growing season emissions
Improved nitrogen fertilizer management practices that reduce growing season nitrous oxide emissions may increase non-growing season emissions Open
Field cropping practices in Canada include routine use of nitrogen (N) fertilizer, which produces substantial amounts of nitrous oxide (N2O) emissions. Adoption of improved N management practices may reduce both the amount of N applied and…
View article: Early improvement of soil health under cropping systems including perennial forage crops and dairy cattle slurry in a cool humid climate
Early improvement of soil health under cropping systems including perennial forage crops and dairy cattle slurry in a cool humid climate Open
In the past decades, dairy farms in eastern Canada have dedicated more land to annual crops and less to perennial forages. Concurrently, there has been a shift in cattle manure management from solid to liquid forms. Our objective was to de…
View article: Review of research studies on nitrous oxide emissions from manure-amended soils in Canada from 1990 to 2023
Review of research studies on nitrous oxide emissions from manure-amended soils in Canada from 1990 to 2023 Open
Nitrous oxide (N 2 O) emissions from manure-amended soils are estimated to be 1525 kt CO 2 e in Canada. The accuracy of this estimate is dependent on emission measurements. However, obtaining accurate measurements is challenging due to the…
View article: Interactive effects of crop types and nitrogen sources on N2O emissions in a cool humid climate
Interactive effects of crop types and nitrogen sources on N2O emissions in a cool humid climate Open
Aims Perennial forages in rotation with annual crops can improve agricultural resilience by increasing soil organic carbon. However, how nitrogen (N) sources interact with rotation diversity to influence soil nitrous oxide (N 2 O) emission…
View article: Field trial guidelines for evaluating enhanced efficiency fertilizers
Field trial guidelines for evaluating enhanced efficiency fertilizers Open
There are many fertilizer additives and alternatives that aim to increase plant nutrient use efficiency and reduce nutrient losses to the environment, here referred to collectively as enhanced efficiency fertilizers (EEFs). However, there …
View article: Two decades of micrometeorological measurements show dynamic drivers of springtime N2O emissions
Two decades of micrometeorological measurements show dynamic drivers of springtime N2O emissions Open
Nitrous oxide (N2O) is a potent greenhouse gas with a global warming potential 265 times that of carbon dioxide and the ability to destroy stratospheric ozone. Agricultural soils contribute over two-thirds of anthropogenic N2O emissions. F…
View article: Tillage effects on growing season nitrous oxide emissions in Canadian cropland soils
Tillage effects on growing season nitrous oxide emissions in Canadian cropland soils Open
Minimizing tillage has been promoted as an agricultural practice that may mitigate greenhouse gas emissions through carbon sequestration. However, there is some ambiguity regarding the effect of minimum tillage (MT) on emissions of other g…
View article: Ratio of non-growing season to growing season N<sub>2</sub>O emissions in Canadian croplands: an update to national inventory methodology
Ratio of non-growing season to growing season N<sub>2</sub>O emissions in Canadian croplands: an update to national inventory methodology Open
National inventory reporting of agricultural nitrous oxide (N 2 O) emissions in Canada is based primarily on measurements obtained using static chambers. In regions with cold winters and an accumulated snowpack (including Canada), these me…
View article: UNECE Guidance Document on Integrated Sustainable Nitrogen Management Nitrogen Opportunities for Agriculture, Food & Environment
UNECE Guidance Document on Integrated Sustainable Nitrogen Management Nitrogen Opportunities for Agriculture, Food & Environment Open
International audience
View article: Combining reduced tillage and green manures minimized N2O emissions from organic cropping systems in a cool humid climate
Combining reduced tillage and green manures minimized N2O emissions from organic cropping systems in a cool humid climate Open
Developing and implementing improved management practices are necessary to enhance the sustainability of organic cropping systems. This study examined the effects of various organic cropping systems on soil greenhouse gas (GHG) emissions a…
View article: Research Progress on Greenhouse Gas Emissions From Livestock in Sub-Saharan Africa Falls Short of National Inventory Ambitions
Research Progress on Greenhouse Gas Emissions From Livestock in Sub-Saharan Africa Falls Short of National Inventory Ambitions Open
Livestock are an important source of livelihoods in agricultural systems in sub-Saharan Africa (SSA), while also being the largest source of national greenhouse gas (GHG) emissions in most African countries. As a consequence, there is a cr…
View article: Greenhouse Gas Emissions Response to Fertilizer Application and Soil Moisture in Dry Agricultural Uplands of Central Kenya
Greenhouse Gas Emissions Response to Fertilizer Application and Soil Moisture in Dry Agricultural Uplands of Central Kenya Open
In sub-Saharan Africa, agriculture can account for up to 66% of anthropogenic greenhouse gas (GHG) emissions. Unfortunately, due to the low number of studies in the region there is still much uncertainty on how management activities can af…
View article: Nitrous oxide emission factors for cattle dung and urine deposited onto tropical pastures: A review of field-based studies
Nitrous oxide emission factors for cattle dung and urine deposited onto tropical pastures: A review of field-based studies Open
Livestock excreta on pastures is an important source of nitrous oxide (N2O) emissions, however studies measuring these emissions in tropical regions, particularly Africa, remain limited. Therefore we measured N2O emissions from different q…
View article: Reduced tillage increased growing season N2O emissions from a fine but not a coarse textured soil under the cool, humid climate of eastern Canada
Reduced tillage increased growing season N2O emissions from a fine but not a coarse textured soil under the cool, humid climate of eastern Canada Open
Reduced tillage is often promoted as a method to sequester carbon (C) in soils and thus mitigate climate change. However, in certain conditions reduced tillage may increase soil nitrous oxide (N2O) fluxes, which may negate any climate gain…
View article: Estimating global terrestrial denitrification from measured N2O:(N2O + N2) product ratios
Estimating global terrestrial denitrification from measured N2O:(N2O + N2) product ratios Open
The use of nitrogen (N) fertilizers and cultivation of N-fixing crops has grown exponentially over the last century, with severe environmental consequences. Most of the anthropogenic reactive nitrogen will ultimately be returned by denitri…
View article: Nitrous oxide emissions and field-level nitrogen balance of maize and other field crops: Data for meta-analysis
Nitrous oxide emissions and field-level nitrogen balance of maize and other field crops: Data for meta-analysis Open
This is a compilation of field research data measuring nitrous oxide emissions from 55 different field crop experiments reported in 66 different publications. The data are mostly maize in the Corn Belt, but also include other cro…
View article: Why future nitrogen research needs the social sciences
Why future nitrogen research needs the social sciences Open
Nitrogen management is on the cusp of becoming a major global policy issue — the international community is gradually acknowledging that the feasibility of an array of environmental, health and food security goals hinges on how humanity ma…
View article: SUSTAINABLE DEVELOPMENT OF CROP-LIVESTOCK FARMS IN AFRICA
SUSTAINABLE DEVELOPMENT OF CROP-LIVESTOCK FARMS IN AFRICA Open
Crop-livestock farms across Africa are highly variable due to in agroecological and socioeconomic factors, the latter shaping the demand and supply of livestock products. Crop-livestock farms in Africa in the 20-first century are very diff…
View article: Quantifying On‐Farm Nitrous Oxide Emission Reductions in Food Supply Chains
Quantifying On‐Farm Nitrous Oxide Emission Reductions in Food Supply Chains Open
Reducing nitrous oxide (N 2 O) emissions from agriculture is critical to limiting future global warming. In response, a growing number of food retailers and manufacturers have committed to reducing N 2 O emissions from their vast networks …
View article: Soil N intensity as a measure to estimate annual N2O and NO fluxes from natural and managed ecosystems
Soil N intensity as a measure to estimate annual N2O and NO fluxes from natural and managed ecosystems Open
As natural and managed terrestrial ecosystems are major sources of the potent greenhouse gas nitrous oxide (N$_{2}$O) and of the atmospheric pollutant nitric oxide (NO), predicting the source strengths of these ecosystems is central to und…
View article: Severe below-maintenance feed intake increases methane yield from enteric fermentation in cattle
Severe below-maintenance feed intake increases methane yield from enteric fermentation in cattle Open
The relationship between feed intake at production levels and enteric CH 4 production in ruminants consuming forage-based diets is well described and considered to be strongly linear. Unlike temperate grazing systems, the intake of ruminan…
View article: Nitrous oxide and methane emissions from cattle manure heaps in Kenya
Nitrous oxide and methane emissions from cattle manure heaps in Kenya Open
<p>Agricultural greenhouse gas (GHG) emissions in Africa contribute 15 % to the global total agricultural emissions, which is in the same range as agricultural emissions from Europe. The majority of these agricultural GHG emissions i…