In Situ Nitrous Oxide and Dinitrogen Fluxes from a Grazed Pasture Soil Following Cow Urine Application at Two Nitrogen Rates

2021 ◽  
Author(s):  
Keren Ding ◽  
Jiafa Luo ◽  
Timothy J. Clough ◽  
Stewart F. Ledgard ◽  
Stuart Lindsey ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Grazed Pasture ◽  
Pasture Soil ◽  
Cow Urine ◽  
Nitrogen Rates

Biochar Incorporation into Pasture Soil Suppresses in situ Nitrous Oxide Emissions from Ruminant Urine Patches

2011 ◽  
Vol 40 (2) ◽  
pp. 468-476 ◽  
Author(s):  
Arezoo Taghizadeh-Toosi ◽  
Tim J. Clough ◽  
Leo M. Condron ◽  
Robert R. Sherlock ◽  
Craig R. Anderson ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Nitrous Oxide Emissions ◽  
Pasture Soil

Nitrous Oxide Emissions from In Situ Deposition of 15 N-Labeled Ryegrass Litter in a Pasture Soil

2013 ◽  
Vol 42 (2) ◽  
pp. 323-331 ◽  
Author(s):  
Pranoy Pal ◽  
Tim J. Clough ◽  
Francis M. Kelliher ◽  
Robert R. Sherlock
Keyword(s):  
Nitrous Oxide ◽  
Nitrous Oxide Emissions ◽  
Pasture Soil ◽  
In Situ Deposition

Effects of short-term freezing on nitrous oxide emissions and enzyme activities in a grazed pasture soil after bovine-urine application

2020 ◽  
Vol 740 ◽  
pp. 140006
Author(s):  
Toru Hamamoto ◽  
Yoshitaka Uchida ◽  
Isabell von Rein ◽  
Ikabongo Mukumbuta
Keyword(s):  
Nitrous Oxide ◽  
Enzyme Activities ◽  
Nitrous Oxide Emissions ◽  
Short Term ◽  
Bovine Urine ◽  
Grazed Pasture ◽  
Pasture Soil

Measured and modelled estimates of nitrous oxide emission and methane consumption from a sheep-grazed pasture

2007 ◽  
Vol 122 (3) ◽  
pp. 357-365 ◽  
Author(s):  
S. Saggar ◽  
C.B. Hedley ◽  
D.L. Giltrap ◽  
S.M. Lambie
Keyword(s):  
Nitrous Oxide ◽  
Nitrous Oxide Emission ◽  
Methane Consumption ◽  
Grazed Pasture

Nitrous oxide emissions from cow urine patches in an intensively managed grassland: Influence of nitrogen loading under contrasting soil moisture

2021 ◽  
Vol 757 ◽  
pp. 143790
Author(s):  
Bhupinder Pal Singh ◽  
Promil Mehra ◽  
Yunying Fang ◽  
Warwick Dougherty ◽  
Surinder Saggar
Keyword(s):  
Nitrous Oxide ◽  
Soil Moisture ◽  
Nitrogen Loading ◽  
Nitrous Oxide Emissions ◽  
Cow Urine ◽  
Intensively Managed

The potential for potassium chloride fertiliser applications to leach cadmium from a grazed pasture soil

Geoderma ◽  
2019 ◽  
Vol 353 ◽  
pp. 293-296
Author(s):  
R.W. McDowell
Keyword(s):  
Potassium Chloride ◽  
Grazed Pasture ◽  
Pasture Soil

Sources of nitrous oxide from 15N-labelled animal urine and urea fertiliser with and without a nitrification inhibitor, dicyandiamide (DCD)

Soil Research ◽  
2008 ◽  
Vol 46 (1) ◽  
pp. 76 ◽  
Author(s):  
H. J. Di ◽  
K. C. Cameron
Keyword(s):  
Nitrous Oxide ◽  
Dairy Cow ◽  
Priming Effect ◽  
Nitrification Inhibitor ◽  
Major Effect ◽  
N2o Emissions ◽  
Soil N ◽  
Cow Urine ◽  
Nitrification And Denitrification ◽  
N Pool

A field lysimeter study was conducted to determine the sources of N2O emitted following the application of dairy cow urine and urea fertiliser labelled with 15N, with and without a nitrification inhibitor, dicyandiamide (DCD). The results show that the application of cow urine at 1000 kg N/ha significantly increased N2O emissions above that from urea applied alone at 25 kg N/ha. The application of urine seemed to have a priming effect, increasing N2O emissions from the soil N pool. Treating the soil with DCD significantly (P < 0.05) decreased N2O emissions from the urine-applied treatment by 72%. The percentage of N2O-N derived from the applied N was 53.1% in the urine-applied treatment and this was reduced to 29.9% when DCD was applied. On average, about 43% of the N2O emitted in the urine-applied treatments was from nitrification. The application of DCD did not have a major effect on the relative contributions of nitrification and denitrification to N2O emissions in the urine treatments. This indicates that the DCD nitrification inhibitor decreased the contributions to N2O emissions from both nitrification and denitrification.

scholarly journals Widespread nitrous oxide undersaturation in farm waterbodies creates an unexpected greenhouse gas sink

2019 ◽  
Vol 116 (20) ◽  
pp. 9814-9819 ◽  
Author(s):  
Jackie R. Webb ◽  
Nicole M. Hayes ◽  
Gavin L. Simpson ◽  
Peter R. Leavitt ◽  
Helen M. Baulch ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Inorganic Nitrogen ◽  
Generalized Additive Models ◽  
Regional Analysis ◽  
Freshwater Ecosystems ◽  
Agricultural Landscapes ◽  
Additive Models ◽  
Water Column Stability ◽  
Flowing Waters

Nitrogen pollution and global eutrophication are predicted to increase nitrous oxide (N2O) emissions from freshwater ecosystems. Surface waters within agricultural landscapes experience the full impact of these pressures and can contribute substantially to total landscape N2O emissions. However, N2O measurements to date have focused on flowing waters. Small artificial waterbodies remain greatly understudied in the context of agricultural N2O emissions. This study provides a regional analysis of N2O measurements in small (<0.01 km2) artificial reservoirs, of which an estimated 16 million exist globally. We show that 67% of reservoirs were N2O sinks (−12 to −2 μmol N2O⋅m−2⋅d−1) in Canada’s largest agricultural area, despite their highly eutrophic status [99 ± 289 µg⋅L−1 chlorophyll-a (Chl-a)]. Generalized additive models indicated that in situ N2O concentrations were strongly and nonlinearly related to stratification strength and dissolved inorganic nitrogen content, with the lowest N2O levels under conditions of strong water column stability and high algal biomass. Predicted fluxes from previously published models based on lakes, reservoirs, and agricultural waters overestimated measured fluxes on average by 7- to 33-fold, challenging the widely held view that eutrophic N-enriched waters are sources of N2O.

scholarly journals Impact of nitrogen compounds on fungal and bacterial contributions to codenitrification in a pasture soil

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
David Rex ◽  
Timothy J. Clough ◽  
Karl G. Richards ◽  
Leo M. Condron ◽  
Cecile A. M. de Klein ◽  
...  
Keyword(s):  
Amino Acid ◽  
Relative Significance ◽  
Total N ◽  
Bacterial Inhibition ◽  
Grazed Pasture ◽  
Fungal Inhibition ◽  
Soil Mesocosms ◽  
The Many ◽  
Acid Substrate

Abstract Ruminant urine patches on grazed grassland are a significant source of agricultural nitrous oxide (N2O) emissions. Of the many biotic and abiotic N2O production mechanisms initiated following urine-urea deposition, codenitrification resulting in the formation of hybrid N2O, is one of the least understood. Codenitrification forms hybrid N2O via biotic N-nitrosation, co-metabolising organic and inorganic N compounds (N substrates) to produce N2O. The objective of this study was to assess the relative significance of different N substrates on codenitrification and to determine the contributions of fungi and bacteria to codenitrification. 15N-labelled ammonium, hydroxylamine (NH2OH) and two amino acids (phenylalanine or glycine) were applied, separately, to sieved soil mesocosms eight days after a simulated urine event, in the absence or presence of bacterial and fungal inhibitors. Soil chemical variables and N2O fluxes were monitored and the codenitrified N2O fluxes determined. Fungal inhibition decreased N2O fluxes by ca. 40% for both amino acid treatments, while bacterial inhibition only decreased the N2O flux of the glycine treatment, by 14%. Hydroxylamine (NH2OH) generated the highest N2O fluxes which declined with either fungal or bacterial inhibition alone, while combined inhibition resulted in a 60% decrease in the N2O flux. All the N substrates examined participated to some extent in codenitrification. Trends for codenitrification under the NH2OH substrate treatment followed those of total N2O fluxes (85.7% of total N2O flux). Codenitrification fluxes under non-NH2OH substrate treatments (0.7–1.2% of total N2O flux) were two orders of magnitude lower, and significant decreases in these treatments only occurred with fungal inhibition in the amino acid substrate treatments. These results demonstrate that in situ studies are required to better understand the dynamics of codenitrification substrates in grazed pasture soils and the associated role that fungi have with respect to codenitrification.

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