scholarly journals Mitigation of Nitrous Oxide Emissions during Nitrification and Denitrification Processes in Agricultural Soils Using Enhanced Efficiency Fertilizers

2019 ◽  
Author(s):  
Yoshitaka Uchida ◽  
Isabell von Rein
Keyword(s):  
Nitrous Oxide ◽  
Agricultural Soils ◽  
Nitrous Oxide Emissions ◽  
Nitrification And Denitrification

Soil nitrous oxide emissions from agricultural soils in Canada: Exploring relationships with soil, crop and climatic variables

2018 ◽  
Vol 254 ◽  
pp. 69-81 ◽  
Author(s):  
Philippe Rochette ◽  
Chang Liang ◽  
David Pelster ◽  
Onil Bergeron ◽  
Reynald Lemke ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Agricultural Soils ◽  
Climatic Variables ◽  
Nitrous Oxide Emissions

The effects of spatial variability of nitrous oxide emissions from grazed pastures on the sampling distribution of chamber measurements

2015 ◽  
Vol 154 (2) ◽  
pp. 223-241 ◽  
Author(s):  
D. L. GILTRAP ◽  
A. J. R. GODFREY
Keyword(s):  
Nitrous Oxide ◽  
Spatial Variability ◽  
Agricultural Soils ◽  
Geometric Mean ◽  
Arithmetic Mean ◽  
Nitrous Oxide Emissions ◽  
Sample Mean ◽  
Grazed Pastures ◽  
Urine Patch ◽  
The Mean

SUMMARYChamber sampling is a common method for measuring nitrous oxide (N2O) emissions from agricultural soils. However, for grazed pastures, the patchy nature of urine deposition results in very high levels of spatial variability in N2O emissions. In the present study, the behaviour of the sample mean was examined by simulating a large number (9999) of random N2O chamber samples under different assumptions regarding the underlying N2O distribution. Using sample sizes of up to 100 chambers, the Central Limit Theorem did not apply. The distribution of the sample mean was always right-skewed with a standard deviation varying between 12·5 and 135% of the true mean. However, the arithmetic mean was an unbiased estimator and the mean of the sample mean distribution was close to the true mean of the simulated N2O distribution. The properties of the sample mean distribution (variance, skewness) were affected significantly by the assumed distribution of the emission factor, but not by distribution of the urine patch concentration. The geometric mean was also investigated as a potential alternative estimator. However, although its distribution had lower variance, it was also biased. Two methods for bias correcting the mean were investigated. These methods reduced the bias, but at the cost of increasing the variance. Neither of the bias-corrected estimators were consistently better than the arithmetic mean in terms of skewness and variance. To improve the estimation of N2O emissions from a grazed pasture using chambers, techniques need to be developed to identify urine patch and non-urine patch areas before sampling.

scholarly journals The use of agricultural soils as a source of nitrous oxide emission in selected communes of Poland

2017 ◽  
Vol 13 (1) ◽  
pp. 39-49
Author(s):  
Paweł Wiśniewski ◽  
Mariusz Kistowski
Keyword(s):  
Nitrous Oxide ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Agricultural Soils ◽  
Nitrous Oxide Emissions ◽  
Organic Soils ◽  
Low Carbon ◽  
Gas Emissions ◽  
Low Carbon Economy ◽  
Carbon Economy

Abstract Nitrous oxide (N2O) is one of the main greenhouse gases, with a nearly 300 times greater potential to produce a greenhouse effect than carbon dioxide (CO2). Almost 80% of the annual emissions of this gas in Poland come from agriculture, and its main source is the use of agricultural soils. The study attempted to estimate the N2O emission from agricultural soils and to indicate its share in the total greenhouse gas emissions in 48 Polish communes. For this purpose, a simplified solution has been proposed which can be successfully applied by local government areas in order to assess nitrous oxide emissions, as well as to monitor the impact of actions undertaken to limit them. The estimated emission was compared with the results of the baseline greenhouse gas inventory prepared for the needs of the low-carbon economy plans adopted by the studied self-governments. This allowed us to determine the share of N2O emissions from agricultural soils in the total greenhouse gas emissions of the studied communes. The annual N2O emissions from agricultural soils in the studied communes range from 1.21 Mg N2O-N to 93.28 Mg N2O-N, and the cultivation of organic soils is its main source. The use of mineral and natural fertilisers, as well as indirect emissions from nitrogen leaching into groundwater and surface waters, are also significant. The results confirm the need to include greenhouse gas emissions from the use of agricultural soils and other agricultural sources in low-carbon economy plans.

scholarly journals Mitigating nitrous oxide emissions from agricultural soils by precision management

2020 ◽  
Vol 7 (1) ◽  
pp. 75 ◽  
Author(s):  
Robert M. REES ◽  
Juliette MAIRE ◽  
Anna FLORENCE ◽  
Nicholas COWAN ◽  
Ute SKIBA ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Agricultural Soils ◽  
Nitrous Oxide Emissions ◽  
Precision Management

scholarly journals ESTIMATION OF NITROUS OXIDE EMISSIONS FROM AGRICULTURAL SOILS IN VOIVODESHIPS IN POLAND

2020 ◽  
Vol XXII (4) ◽  
pp. 94-104
Author(s):  
Anna Jędrejek
Keyword(s):  
Nitrous Oxide ◽  
Winter Wheat ◽  
Agricultural Soils ◽  
Ghg Emissions ◽  
Organic Content ◽  
Nitrous Oxide Emissions ◽  
Regional Differentiation ◽  
N2o Emissions ◽  
Winter Rape ◽  
Winter Triticale

The purpose of this study was to estimate nitrogen oxide emissions from soils used for agricultural purposes by voivodships. Compared N2O emissions were estimated according to the recommended IPCC (tier 1) method with simulated emissions using the DNDC (tier 3) model. Analyses were done for crop rotation (winter rape, winter wheat, winter wheat, winter triticale) in four cropping systems. Moreover, simulated N2O emissions from winter rape and winter triticale cultivation showed lower emissions and constituted 1475% and 13-76% of IPCC estimated emissions, respectively. The use of the model also enabled the determination of factors, which have an impact on nitrous oxide emissions and define its regional differentiation. The analysis showed that with increasing initial soil organic content, emissions of N2O rise and decrease with increasing precipitation or carbon sequestration. Considering the requirements for reduction GHG emissions, improving the methodology used in estimating nitrous oxide emissions is of significant practical value.

Developing a country specific method for estimating nitrous oxide emissions from agricultural soils in Canada

2020 ◽  
Vol 117 (2) ◽  
pp. 145-167 ◽  
Author(s):  
Chang Liang ◽  
Douglas MacDonald ◽  
Arumugam Thiagarajan ◽  
Corey Flemming ◽  
Darrel Cerkowniak ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Agricultural Soils ◽  
Nitrous Oxide Emissions ◽  
Specific Method ◽  
Country Specific
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