Improving nitrogen use efficiency in irrigated cotton production DOI Creative Commons
Clemens Scheer, David Rowlings, Diógenes L. Antille

et al.

Nutrient Cycling in Agroecosystems, Journal Year: 2022, Volume and Issue: 125(2), P. 95 - 106

Published: April 11, 2022

Abstract Irrigated cotton in Australia is mainly grown on heavy textured soils which are prone to waterlogging, resulting significant losses of nitrogen (N) via denitrification and surface run-off. This study investigated fertiliser use efficiency (fNUE) over three seasons five commercial farms using the 15 N tracer technique. Fertiliser NUE was consistently low across all fertilised treatments, with average 47% applied lost only 17% taken up by crop derived from fertiliser. There no effect different products rates lint yield. High yields (0.9–3.6 Mg ha −1 ) could be achieved even without application fertiliser, demonstrating mineralisation soil organic N, residual or returned residues, as key source these cropping systems. Using nitrification inhibitor DMPP overhead instead furrow irrigation showed potential reduce losses. The results demonstrate that under current on-farm management fNUE irrigated highlight need account for stocks when assessing optimized rates. substantial scope improve any impact yield, adjusting rates, particular combination DMPP. a promising approach not water efficiency, but also

Language: Английский

Factors That Influence Nitrous Oxide Emissions from Agricultural Soils as Well as Their Representation in Simulation Models: A Review DOI Creative Commons
Cong Wang, Barbara Amon, Karsten Schulz

et al.

Agronomy, Journal Year: 2021, Volume and Issue: 11(4), P. 770 - 770

Published: April 14, 2021

Nitrous oxide (N2O) is a long-lived greenhouse gas that contributes to global warming. Emissions of N2O mainly stem from agricultural soils. This review highlights the principal factors peer-reviewed literature affecting emissions soils, by grouping into three categories: environmental, management and measurement. Within these categories, each impact factor explained in detail its influence on soil summarized. It also shown how influences other factors. Process-based simulation models used for estimating are reviewed regarding their ability consider simulating N2O. The model strengths weaknesses managed soils Finally, selected process-based (Daily Century (DAYCENT), DeNitrification-DeComposition (DNDC), Soil Water Assessment Tool (SWAT)) discussed widely simulate cropping systems. Their evaluated describing components relevant processes representation model.

Language: Английский

Citations

196
Global evaluation of inhibitor impacts on ammonia and nitrous oxide emissions from agricultural soils: A meta‐analysis DOI Creative Commons
Daijia Fan, Wentian He, Ward Smith

et al.

Global Change Biology, Journal Year: 2022, Volume and Issue: 28(17), P. 5121 - 5141

Published: June 9, 2022

Inhibitors are widely considered an efficient tool for reducing nitrogen (N) loss and improving N use efficiency, but their effectiveness is highly variable across agroecosystems. In this study, we synthesized 182 studies (222 sites) worldwide to evaluate the impacts of inhibitors (urease [UI], nitrification [NI] combined inhibitors) on crop yields gaseous (ammonia [NH3 ] nitrous oxide [N2 O] emissions) explored responses different management environmental factors including inhibitor application timing, fertilization regime, cropping system, water management, soil properties climatic conditions using subgroup meta-analysis, meta-regression multivariate analyses. The UI were most effective in enhancing (by 5%) NH3 volatilization 51%), whereas NI at N2 O emissions 49%). mitigates increases especially high -N scenarios, would minimize net resultant low scenarios. Alternatively, enables producers balance production conservation goals without pollution tradeoffs. efficacy decreasing was dependent upon practices. Notably, both analyses suggest that provide a greater opportunity fertilizer inputs high-N-surplus systems presumably favor yield enhancement under deficiency situations. pursuit improved understanding interactions between plant-soil-climate-management types should continue optimize losses while increasing productivity.

Language: Английский

Citations

94
A global synthesis of soil denitrification: Driving factors and mitigation strategies DOI
Baobao Pan, Longlong Xia, Shu Kee Lam

et al.

Agriculture Ecosystems & Environment, Journal Year: 2022, Volume and Issue: 327, P. 107850 - 107850

Published: Jan. 5, 2022

Language: Английский

Citations

78
The anaerobic soil volume as a controlling factor of denitrification: a review DOI Creative Commons
Steffen Schlüter, Maik Lucas, Balázs Grosz

et al.

Biology and Fertility of Soils, Journal Year: 2024, Volume and Issue: unknown

Published: April 16, 2024

Abstract Denitrification is an important component of the nitrogen cycle in soil, returning reactive to atmosphere. activity often concentrated spatially anoxic microsites and temporally ephemeral events, which presents a challenge for modelling. The anaerobic fraction soil volume can be useful predictor denitrification soils. Here, we provide review this characteristic, its controlling factors, estimation from basic properties implementation current models. concept relationship has undergone several paradigm shifts that came along with advent new oxygen microstructure mapping techniques. understanding hotspots are partially decoupled air distances wet matrix mainly associated particulate organic matter (POM) form fresh plant residues or manure. POM fragments harbor large amounts labile carbon promote local consumption and, as result, these differ their aeration status surrounding matrix. Current models relate bulk concentration various ways but make little use information, such distance between air-filled pores. Based on meta-analyses, derive empirical relationships estimate conditions formation anoxia at microscale outline how could used future improve prediction accuracy profile scale.

Language: Английский

Citations

21
Dissimilatory nitrate reduction to ammonium (DNRA), not denitrification dominates nitrate reduction in subtropical pasture soils upon rewetting DOI Creative Commons
Johannes Friedl, Daniele De Rosa, David Rowlings

et al.

Soil Biology and Biochemistry, Journal Year: 2018, Volume and Issue: 125, P. 340 - 349

Published: Aug. 11, 2018

Language: Английский

Citations

136
Determination of nitrogen balance in agroecosystems DOI Creative Commons
Upendra M. Sainju

MethodsX, Journal Year: 2017, Volume and Issue: 4, P. 199 - 208

Published: Jan. 1, 2017

Nitrogen balance in agroecosystems provides a quantitative framework of N inputs and outputs retention the soil that examines sustainability agricultural productivity environmental quality. include additions from manures fertilizers, atmospheric depositions including wet dry depositions, irrigation water, biological fixation. removal crop grain biomass losses through leaching, denitrification, volatilization, surface runoff, erosion, gas emissions, plant senescence. balance, which is difference between outputs, can be reflected changes total (organic + inorganic) during course experiment duration due to immobilization mineralization. While increased mineralization enhance yields decrease fertilization rate, reduced leaching emissions (primarily NH4 NOx out N2O potent greenhouse gas) improve water air •This paper discusses measurements estimations (for non-measurable parameters complexity) all as well storage calculate balance.•The method shows flows, soil, environment agroecosystems.•The used measure agroecosystem performance quality practices.

Language: Английский

Citations

98
Rainfall and conduit drainage combine to accelerate nitrate loss from a karst agroecosystem: Insights from stable isotope tracing and high-frequency nitrate sensing DOI Creative Commons
Fu‐Jun Yue, Si‐Liang Li, Susan Waldron

et al.

Water Research, Journal Year: 2020, Volume and Issue: 186, P. 116388 - 116388

Published: Sept. 3, 2020

Understanding where nitrate is mobilized from and under what conditions required to reduce loss protect water quality. Low frequency sampling may inadequately capture hydrological biogeochemical processes that will influence behavior. We used high-frequency isotope in-situ sensing explore export transformation in a karst critical zone. Nitrate was mobilised during light rainfall, transferred soil layers the matrix, some retained denitrified. isotopic composition changed rapidly rising limb of events slowly falling limb. The main source synthetic fertiliser (up 80% event flow), transported by conduit flow following high rainfall events, this contribution increased significantly as discharge increased. Soil organic nitrogen remained constant indicating at baseflow primary source. Isotope appointment revealed fertilizer accounted for more than half total export, which double secondary (soil nitrogen), providing valuable information inform catchment management losses fluvial loading. Careful land use are necessary avoid pollution agroecosystem, example timing applications allow plant uptake before can flush it soils into ultimately drainage.

Language: Английский

Citations

97
The effect of temperature and moisture on the source of N2O and contributions from ammonia oxidizers in an agricultural soil DOI
Rui Liu, Helen L. Hayden, Helen Suter

et al.

Biology and Fertility of Soils, Journal Year: 2016, Volume and Issue: 53(1), P. 141 - 152

Published: Dec. 12, 2016

Language: Английский

Citations

92
Estimating global terrestrial denitrification from measured N2O:(N2O + N2) product ratios DOI Creative Commons
Clemens Scheer, Kathrin Fuchs, David E. Pelster

et al.

Current Opinion in Environmental Sustainability, Journal Year: 2020, Volume and Issue: 47, P. 72 - 80

Published: Sept. 24, 2020

The use of nitrogen (N) fertilizers and cultivation N-fixing crops has grown exponentially over the last century, with severe environmental consequences. Most anthropogenic reactive will ultimately be returned by denitrification to atmosphere as inert N2, but magnitude ratio N2O (N2O + N2) emitted (RN2O) is unknown for vast majority terrestrial ecosystems. This paper provides estimates RN2O reviewing existing literature compiling a N budget global land surface. We estimate that doubled from 80 Tg-N year−1 in pre-industrial times 160 2005 mean approximately 0.08. conclude upscaling can provide spatial when data acetylene inhibition methods are excluded. Recent advances methodologies measure N2 emissions under field conditions could open way more effective management flows.

Language: Английский

Citations

92
Soil pH and long-term fertilization affect gross N transformation and N2O production pathways in Chinese and UK croplands DOI
Chong Zhang, Xiaotang Ju, Jinbo Zhang

et al.

Biology and Fertility of Soils, Journal Year: 2023, Volume and Issue: 59(5), P. 527 - 539

Published: Jan. 7, 2023

Language: Английский

Citations

29