https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47725 2 emission into the atmosphere along with the soil respiratory CO₂ fluxes but is comparatively less studied than the organic C mineralisation processes. This study aims to understand how soil available carbonates influence the soil C dynamics under different tillage, mulching and temperature regimes. A 90-day incubation experiment was conducted by adding calcite nodules to soils (10% w/w) collected from an agricultural field maintained with or without 5 t ha⁻¹ mulching under no-till (NT) or conventional tillage (CT) systems. Environmental Scanning Electron Microscope (ESEM) examination indicated greater morphological changes in the calcite nodules incubated with CT than NT soils. Soil samples incubated with calcite and mulching recorded 6.3% greater CO₂ evolution than the un-mulched condition. Under the CT system, the overall CO₂ emission rate was higher in the control treatment (43%), followed by a combined treatment of 5 t ha⁻¹ mulch + CaCO₃ (10% w/w) (29.2%), 5 t ha⁻¹ mulch only treatment (27.9%), and 10% CaCO₃ (w/w) (16.5%) treatment, with a rise in incubation temperature from 22 °C to 37 °C. Kinetic model calculations for CO₂ emission indicated a greater half-life of easily mineralisable C pools in the NT system at 22 °C. Microbial biomass carbon (MBC) results further verified that the high temperature and disturbed soil conditions limit the availability of soil MBC under the CT systems, indicating a higher decomposition rate. Eventually, these results indicated that agricultural management practices, including tillage shift, explicitly influence the different functional components of soil organic matter (SOM).]]> Wed 28 Feb 2024 14:56:49 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39627 Wed 28 Feb 2024 14:54:32 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47735 14C-labelled L-alanine (C₃H₇NO₂) to investigate key N cycling processes in the soil. Mortalities were a significant source of N and carbon (C), providing an average of 42 and 236 g/kg, respectively, to the soil directly below the decomposing carcasses. There was also a significant and long-term input of amino acids (ca. 11 mg/kg) into the soil. The abundance of N increased the microbial turnover of labile N substances in the tracer experiment. Based on results from this study, it has been demonstrated that decaying carcasses provide a significant and long-lasting localized resource with the potential to contribute to soil N cycling. Therefore, it is important to develop guidelines on the management of carcass burial farmland using soil from burial pits as a nutrient supplement where biosecurity is assured.]]> Wed 25 Jan 2023 14:53:38 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46441 Thu 24 Nov 2022 14:07:36 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:30898 Scaevola albida, Chrysocephalum semipapposum, and Enteropogon acicularis. Some Australian native plants inhibited nitrification in their rhizosphere. We propose future studies on these selected plant species by identifying and characterising the nitrification inhibiting compounds and also the potential of nitrification inhibition in reducing nitrogen losses through nitrate leaching and nitrous oxide emission.]]> Sat 24 Mar 2018 07:30:39 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24017 Sat 24 Mar 2018 07:16:45 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:36596 Fri 22 Apr 2022 10:20:45 AEST ]]>