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Denitrification in Agricultural Soils – Integrated control and Modelling at various scales (DASIM)NARA Subscribed
The special issue summarises and highlights key findings of the research unit DASIM funded by the German Research Foundation (DFG) on the process of denitrification. Progress was made in several areas including the development of new and advanced methods to quantify N 2 fluxes such as a new 15 N gas flux method, enhanced Raman spectroscopy and a new incubation system to study plant-soil interactions in He-O 2 atmosphere. Under...
Strategies for mitigating N2O and N2 emissions from an intensive sugarcane cropping systemNARA Subscribed
In sugarcane cropping systems, high rates of N fertiliser are typically applied as sub-surface bands creating localised zones of high mineral N concentrations. This in combination with high levels of crop residue (trash) retention and a warm and humid climate creates conditions that are known to promote soil denitrification, resulting in high emissions of the potent greenhouse gas N 2 O. These losses illustrate inefficient use...
Irrigated cotton in Australia is mainly grown on heavy textured soils which are prone to waterlogging, resulting in significant losses of nitrogen (N) via denitrification and surface run-off. This study investigated fertiliser nitrogen use efficiency (fNUE) over three seasons on five commercial cotton farms using the 15 N tracer technique. Fertiliser NUE was consistently low across all fertilised treatments, with on average 47...
Amplitude and frequency of wetting and drying cycles drive N2 and N2O emissions from a subtropical pastureNARA Subscribed
This study investigated the effects of irrigation frequency on N 2 and N 2 O emissions from an intensively managed pasture in the subtropics. Irrigation volumes were estimated to replace evapotranspiration and were applied either once (low frequency) or split into four applications (high frequency). To test for legacy effects, a large rainfall event was simulated at the end of the experiment. Over 15 days, 7.9 ± 2.7 kg N 2 + N...
A tribute to Robert John Porra (august 7, 1931–may 16, 2019)NARA Subscribed
Effect of urbanization on soil methane and nitrous oxide fluxes in subtropical AustraliaNARA Subscribed
Increasing population densities and urban sprawl are causing rapid land use change from natural and agricultural ecosystems into smaller, urban residential properties. However, there is still great uncertainty about the effect that urbanization will have on biogeochemical C and N cycles and associated greenhouse gas (GHG) budgets. We aimed to evaluate how typical urbanization related land use change in subtropical Australia af...
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