https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35624 Wed 27 Sep 2023 15:37:41 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36405 Wed 24 May 2023 09:45:52 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:45426 2-Cd was negatively related to soil available Si (p < 0.05). The synergistic effect of BR and Si induced liming effect and co-precipitation of Cd with Si compounds during the aging process of biochar. Thus, we suggest that an alkaline silicon supplementation is used as an amendment to BR, which could be used as a strategic approach for tackling Cd contamination in South China rice paddies.]]> Wed 22 Mar 2023 19:01:08 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24498 Wed 11 Apr 2018 15:53:35 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:20521 Wed 11 Apr 2018 15:31:05 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:18359 Wed 11 Apr 2018 14:25:54 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:31399 Wed 11 Apr 2018 14:16:38 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26326 Wed 11 Apr 2018 14:15:03 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:25911 Wed 11 Apr 2018 12:36:05 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:25044 Wed 11 Apr 2018 11:09:42 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:23079 Wed 11 Apr 2018 09:21:28 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:45684 Wed 07 Feb 2024 16:37:32 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:49035 Wed 03 May 2023 13:48:29 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:34657 Tue 03 Sep 2019 18:27:15 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:37530 3)₂ or as N captured in field-aged biochar at five increasing N doses to quinoa and perennial ryegrass in pots. Interestingly, the biochar-captured N was as plant available as the mineral nitrate, except for the highest dosage. Refuting our hypothesis, no significant amounts of N were extractable at the end of the study from the biochar–soil mixtures with repeated-extraction protocols. Thus, N captured by biochar may improve the N use efficiency in agriculture. Further research should evaluate the role of biochar particle size, root morphology, mycorrhization, and soil moisture (variations) for nitrate retrieval from biochar particles by plants because the captured biochar N was less available in the field as under present controlled conditions.]]> Thu 21 Oct 2021 12:51:47 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47417 Thu 19 Jan 2023 12:49:24 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:31187 Sat 24 Mar 2018 08:42:54 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26304 −1 may not return a profit to the farmer due to the high cost of biochar. In this study biochar was modified through pre-treating the biomass and post-treating with phosphoric acid, minerals and different chemical fertilisers to study the effects of two new enhanced biochar fertilisers on the yield and quality of green pepper in a field experiment with 5 fertilisation treatments and 3 replications. The two new biochar fertilisers significantly (P « 0.05) increased the yield of green pepper (11.33–11.47 t ha⁻¹), compared with the conventional chemical fertiliser (9.72 t ha⁻¹). The biochar fertiliser treatments improved the vitamin C content of green pepper from 236.99 to 278.28 mg kg⁻¹, and also significantly (P < 0.05) reduced the nitrate content from 132.32 to 101.92 mg kg⁻¹, compared with chemical fertiliser. This study indicated that, compared to the use of conventional chemical fertiliser, all of the biochar fertiliser treatments could significantly improve the yield and quality of green pepper.]]> Sat 24 Mar 2018 07:40:40 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26306 Sat 24 Mar 2018 07:40:40 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30741 13CO₂ pulse labelling of ryegrass was used to monitor belowground C allocation, SOC priming, and stabilization of root-derived C for a 15-month period—commencing 8.2 years after biochar (Eucalyptus saligna, 550 °C) was amended into a subtropical ferralsol. We found that field-aged biochar enhanced the belowground recovery of new root-derived C (¹³C) by 20%, and facilitated negative rhizosphere priming (it slowed SOC mineralization by 5.5%, that is, 46 g CO₂-C m⁻² yr⁻¹). Retention of root-derived ¹³C in the stable organo-mineral fraction (<53 μm) was also increased (6%, P < 0.05). Through synchrotron-based spectroscopic analysis of bulk soil, field-aged biochar and microaggregates (<250 μm), we demonstrate that biochar accelerates the formation of microaggregates via organo-mineral interactions, resulting in the stabilization and accumulation of SOC in a rhodic ferralsol.]]> Sat 24 Mar 2018 07:39:28 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26348 Sat 24 Mar 2018 07:35:54 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26378 −1, on the mycorrhizal colonisation, wheat growth and nutrient uptake, and soil quality improvement. It was found that the phosphorus (P) and nitrogen uptake in wheat shoots were significantly greater for a low application rate of BMCs (100 kg ha⁻¹). The present formulation of BMC was effective in enhancing growth of wheat at low application rate (100 kg ha⁻¹). The increase in growth appeared due to an increase in P uptake in the plants that could be partly attributed to an increase in mycorrhizal colonisation and partly due to the properties of the BMC.]]> Sat 24 Mar 2018 07:33:06 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30887 Sat 24 Mar 2018 07:30:40 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:23367 Sat 24 Mar 2018 07:16:31 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48453 Mon 29 Jan 2024 17:52:57 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:37730 Mon 29 Jan 2024 17:46:06 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36403 Mon 27 Apr 2020 14:01:04 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26223 Fri 25 May 2018 18:47:58 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:34515 in situ during composting using Fourier Transform Infrared Spectroscopy (FTIR). Emissions of N₂O from the biochar-amended composting mixtures decreased significantly (P < 0.05) soon after commencement of the composting process compared with the non-amended control. The cumulative emissions of N₂O over 8 weeks in the GWB composting mixture (GWBC), PLB composting mixture (PLBC) and control (no biochar) were 4.2, 5.0 and 14.0 g N₂O-N kg⁻¹ of total nitrogen (TN) in composting mixture, respectively (P < 0.05). The CH₄ emissions were significantly (P < 0.05) lower in the GWBC and PLBC treatments than the control during the period from day 8 to day 36, when anaerobic conditions likely prevailed. The cumulative CH4 emissions were 12, 18 and 80 mg CH₄-C kg⁻¹ of total carbon (TC) for the GWBC, PLBC and control treatments, respectively, though due to wide variation between replicates this difference was not statistically significant. The cumulative N₂O and CH₄ emissions were similar between the GWBC and PLBC despite differences in properties of the two biochars. X-ray Photoelectron Spectroscopy (XPS) analysis and SEM imaging of the composted biochars indicated the presence of iron oxide compounds and amine-NH₃ on the surface and pores of the biochars (PLB > GWB). The change in nitrogen (N) functional groups on the biochar surface after composting is evidence for sorption and/or reaction with N from labile organic N, mineral N, and gaseous N (e.g. N₂O). The concentration of NH⁺₄ increased during the thermophilic phase and then decreased during the maturation phase, while NO⁻₃ accumulated during the maturation phase. Total N retained was significantly (P < 0.05) higher in the PLBC (740 g) and the GWBC (660 g) relative to the control (530 g). The TC retained was significantly higher in the GWBC (10.0 kg) and the PLBC (8.5 kg) cf. the control (6.0 kg). Total GHG emissions across the composting period were 50, 63 and 183 kg CO₂-eq t⁻¹ of initial mass of GWBC, PLBC and control (dry weight basis) respectively. These results support the co-composting of biochar to lower net emissions of GHGs while increasing N retention (and fertiliser N value) in the mature compost.]]> Fri 22 Mar 2019 12:57:03 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:34178 Fri 22 Apr 2022 10:21:33 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:34692 −1 PO₄-P solution, to produce a parallel set of P-exposed biochars. Biochar exterior and/or interior surfaces were quantitatively characterised using laser-ablation (LA)-ICP-MS, X-ray diffraction, X-ray photo-electron spectroscopy (XPS) and scanning electron microscopy coupled with energy dispersive X-ray. The results highlighted the general importance of Fe minerals in P capture. XPS analysis of POCAD550 indicated lower oxidation state Fe2p3 bonding compared to POCAD450, and LA-ICP-MS indicated stronger covariation of Fe and S, even after P exposure. This suggests that low-solubility Fe/S compounds are formed during pyrolysis, are affected by process parameters and impact on P capture. Other data suggested capture roles for aluminium, calcium and silicon. Overall, our analyses suggest that a range of mechanisms for P capture are concurrently active in biochar. We highlighted the potential to manipulate these through choice of form and composition of feedstock as well as pyrolysis processing, so that biochar may be increasingly tailored towards specific functionality.]]> Fri 12 Apr 2019 14:00:53 AEST ]]>