Denitrification in Agricultural Soils – Integrated control and Modelling at various scales (DASIM)

Biology and Fertility of Soils, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 20, 2025

Abstract The special issue summarises and highlights key findings of the research unit DASIM funded by German Research Foundation (DFG) on process denitrification. Progress was made in several areas including development new advanced methods to quantify N 2 fluxes such as a 15 gas flux method, enhanced Raman spectroscopy incubation system study plant-soil interactions He-O atmosphere. Understanding denitrification disturbed structured soil gained combining X-ray CT scanning microbial ecology methods. High resolution models developed part were able successfully simulate experimental data provide valuable insights for improvement existing ecosystem models. Improved tracing tools analysis soil-plant systems have been that are extensively used associated partners. brought together an interdisciplinary network researchers interested analytical but also modelling aspects. This includes close collaboration with FAO/IAEA centre Nuclear Techniques Food Agriculture United Nations which resulted open access book describes DASIM. impact scientific community is manifold will most likely lasting understanding nitrogen cycling terrestrial ecosystems.

Language: Английский

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Dairy effluent mitigates N2O missions while extreme precipitation stimulates N2O losses in a sandy soil

Frontiers in Environmental Science, Journal Year: 2025, Volume and Issue: 13

Published: March 25, 2025

Dairy effluents instead of mineral fertilizer can realize nutrients recycling while urease inhibitors have been proposed as amendments to maximize utilization and reduce negative environmental effects. However, studies on the impacts dairy effluent combined with nitrous oxide (N 2 O) nitric (NO) emissions remain limited. Here, a 2-year field trail maize was conducted in sandy soil four treatments: no nitrogen (N) (Control), N urea (NPK), fermented liquid (LF), LF plus inhibitor hydroquinone (LFHQ). Cumulative O emission NPK treatment 0.44 kg ha ‒1 during 2021 season drastically increased 5.21 2022 extreme precipitation occurred, NO reduced from 0.65 0.17 . Compared treatment, decreased by 38.6% 29.2%, 38.8% 6.4% seasons, respectively. LFHQ 40.7% 21.7% The factors (EF-N applied 0.90–1.71% season, which ten times greater than season. We further evaluated correlation between EF-N annual temperate soils compiling published literature, suggesting that there quadratic relationship precipitation, highest occurring at ∼690 mm precipitation. Accordingly, would induce explosive optimal scenario. Overall, our results suggest replacing fertilizers mitigated heavy rainfall could cause paroxysmal emission. Thus, rational water management farms is particularly required avoid surge after events, co-application nitrification are recommended under application.

Language: Английский

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Mechanistic insights into oxychar’ s role in mitigating ammonia volatilization from fertilised alkaline soils

The Science of The Total Environment, Journal Year: 2025, Volume and Issue: 979, P. 179502 - 179502

Published: April 27, 2025

Mitigating ammonia (NH3) volatilization from fertilised alkaline soils is crucial for promoting environmental sustainability and safeguarding public health. In this study, "oxychar" was prepared an agricultural waste via a low-temperature partial-oxidation (LTPO) process under oxygen-sufficient environment. The optimum modification temperature 220 °C duration of 3 h, yielding maximum NH3 uptake 76.4 mg/g by oxychar. enhanced adsorption capacity stability are attributed to the increased surface oxygen-containing functional groups (OCFGs) that act as sites, well presence ultra-micropores facilitate effective trapping. When applying optimised oxychar 21-day incubation studies, it found cumulative reduced 76.3 %-91.6 % with application rates 1 %-3 %, compared urea treatments. Soil property microbial community analyses further indicate promotes hydrolysis reduction nitrate ammonium dissimilation (DNRA) processes while inhibiting nitrification modulating communities, resulting in higher lower levels soil treatment. However, enriched cannot volatilize freely due chemisorption ionic covalent bonds, respectively. Introducing could be promising approach mitigate ensure food security sustainability.

Language: Английский

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Organic fertilizer amendment decreased N2O/(N2O+N2) ratio by enhancing the mutualism between bacterial and fungal denitrifiers in high nitrogen loading arable soils

Soil Biology and Biochemistry, Journal Year: 2024, Volume and Issue: 198, P. 109550 - 109550

Published: Aug. 9, 2024

Language: Английский

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