PurposeThe implications of increased applications of high quality cattle manure to agricultural systems in Africa on N2O emissions are still only partially understood.MethodsA field experiment was carried out in a wetland in central Zimbabwe to determine the effects of cattle manure quality on emissions of N2O during the growing seasons of rape and tomato crops. The static chamber and gas chromatography techniques were used to capture and measure fluxes of N2O.ResultsThe substitution of low N by high N manure significantly increased N2O fluxes and total N lost through N2O emission. Emissions of N2O increase with increasing content of N in applied manure.ConclusionsGiven that N2O in agricultural soil is produced predominantly through the microbial transformations of inorganic N, the potential of a soil to emit N2O 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 N2O, 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 N2O 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 N2O.
Nitrous oxide emissions from wetland soil amended with two types of cattle manure
J. Masaka,J. Nyamangara,M. Wuta
Published 2016 in International Journal of Recycling of Organic Waste in Agriculture
ABSTRACT
PUBLICATION RECORD
- Publication year
2016
- Venue
International Journal of Recycling of Organic Waste in Agriculture
- Publication date
2016-04-23
- Fields of study
Agricultural and Food Sciences, Environmental Science
- Identifiers
- External record
- Source metadata
Semantic Scholar
CITATION MAP
EXTRACTION MAP
CLAIMS
CONCEPTS
- dry matter yield
The harvested crop biomass measured on a dry-weight basis.
Aliases: harvested dry matter yield, biomass yield
- high n manure
A cattle manure treatment with relatively high nitrogen content used in the field experiment.
Aliases: high-N manure, high nitrogen manure
- low n manure
A cattle manure treatment with relatively low nitrogen content used as the comparison manure treatment.
Aliases: low-N manure, low nitrogen manure
- manure application rate
The amount of cattle manure applied to the field plots.
Aliases: application rate
- nitrous oxide emissions
The N2O fluxes and cumulative gas losses measured from the soil surface in the experiment.
Aliases: N2O emissions, N2O fluxes, nitrous oxide fluxes
- n uptake
The amount of nitrogen absorbed by the crop biomass during growth.
Aliases: nitrogen uptake
- wetland soil
The agricultural wetland soil in central Zimbabwe where the manure treatments were applied.
Aliases: wetland
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