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- Title
Nitrous oxide emissions from wetland soil amended with two types of cattle manure.
- Authors
Masaka, Johnson; Nyamangara, Justice; Wuta, Menas
- Abstract
Purpose: The implications of increased applications of high quality cattle manure to agricultural systems in Africa on NO 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 NO during the growing seasons of rape and tomato crops. The static chamber and gas chromatography techniques were used to capture and measure fluxes of NO. Results: The substitution of low N by high N manure significantly increased NO fluxes and total N lost through NO emission. Emissions of NO increase with increasing content of N in applied manure. Conclusions: Given that NO in agricultural soil is produced predominantly through the microbial transformations of inorganic N, the potential of a soil to emit NO 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 NO, 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 NO 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 NO.
- Subjects
WETLAND agriculture; SOIL amendments; CATTLE manure; NITROUS oxide; NITROGEN content of manures; MANURES &; the environment; EMISSIONS (Air pollution)
- Publication
International Journal of Recycling of Organic Waste in Agriculture, 2016, Vol 5, Issue 2, p125
- ISSN
2195-3228
- Publication type
Article
- DOI
10.1007/s40093-016-0123-9