Nitrous oxide emissions from wetland soil amended with two types of cattle manure

Purpose The implications of increased applications of high quality cattle manure to agricultural systems in Africa on N 2 O emissions are still only partially understood. Methods A field experiment was carried out in a wetland in central Zimbabwe to determine the effects of cattle manure quality on...

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Bibliographic Details
Published in:International journal of recycling of organic waste in agriculture 2016-06, Vol.5 (2), p.125-140
Main Authors: Masaka, Johnson, Nyamangara, Justice, Wuta, Menas
Format: Article
Language:English
Subjects:
Agriculture
Aquatic Pollution
Cattle
Climate change
Earth and Environmental Science
Emissions
Environment
GHGs
Lycopersicon esculentum
Manures
Mineralization
Nitrogen
Nitrous oxide
Original Research
Soil sciences
Waste Water Technology
Water Management
Water Pollution Control
Wetlands
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Summary:Purpose The implications of increased applications of high quality cattle manure to agricultural systems in Africa on N 2 O emissions are still only partially understood. Methods A field experiment was carried out in a wetland in central Zimbabwe to determine the effects of cattle manure quality on emissions of N 2 O during the growing seasons of rape and tomato crops. The static chamber and gas chromatography techniques were used to capture and measure fluxes of N 2 O. Results The substitution of low N by high N manure significantly increased N 2 O fluxes and total N lost through N 2 O emission. Emissions of N 2 O increase with increasing content of N in applied manure. Conclusions Given that N 2 O in agricultural soil is produced predominantly through the microbial transformations of inorganic N, the potential of a soil to emit N 2 O increases with the increasing availability of N and consequently the N content in applied manure. The applications of lower rate of high and low N manures were followed by lower emissions of N 2 O, a result that is favorable to the objective of lowering the contribution of agricultural sources to the global greenhouse gas emissions. The loss of N in emissions of N 2 O expressed per unit mass of harvested dry matter yield decreases with increasing manure application, dry matter yield and N uptake. Improved agronomic practices for increased crop productivity can be used as a mitigation factor for reducing the contribution of agriculture in the global emissions of N 2 O.
ISSN:2195-3228
2251-7715
DOI:10.1007/s40093-016-0123-9