scholarly journals Effect of straw incorporation and nitrification inhibitor on nitrous oxide emission in various cropland soils and its microbial mechanism

2021 ◽  
Author(s):  
Yabo Zhang ◽  
Feng Liu ◽  
Juntao Wang ◽  
Hangwei Hu ◽  
Jizheng He ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Nitrogen Use Efficiency ◽  
Nitrogen Balance ◽  
Nitrification Inhibitor ◽  
N2o Emission ◽  
Soil Types ◽  
Nitrogen Use ◽  
Nosz Gene ◽  
Use Efficiency ◽  
Straw Incorporation

Nitrification inhibitor and straw incorporation are widely used to improve crop nitrogen use efficiency in agricultural soil, but their effects on nitrous oxide (N2O) emission across different soil types and the microbial mechanisms remain less understood. In this study, we used controlled experiment and DNA-based molecular analysis to study how nitrification inhibitor (dicyandiamide, DCD) and straw incorporation affect soil nitrogen balance, N2O emission and microbial nitrifiers/denitrifers in three distinct agricultural soils (the black, fluvo-aquic and red soils) across China. Both DCD and straw incorporation improved nitrogen balance by increasing NH4+ and decreasing NO3- in all soils. DCD tended to decrease N2O emission from all soils especially the Fluvo-aquic one, while straw incorporation reduced N2O emission only in the fluvo-aquic soil but increased N2O emission in the other two especially the red soil (by ~600%). T-RFLP analysis revealed that the denitriers community structure are distinct among the three soils, but was not strongly affected by DCD or straw incorporation. qPCR analysis revealed that DCD or straw incorporation had no significant effect on nitrifier abundance, but increased nitrous oxide reductase nosZ gene abundance in the black/fluvo-aquic soil rather than the red soil. Structural equational modelling further confirmed that, when accounting for treatments and soil properties, nosZ gene abundance is the only biological factor significantly determined N2O emission in different soil types. Taken together, our work advanced the knowledge on the agricultural practices and N2O emission in cropland soils, and suggested that straw incorporation may not be a good choice for the red and black soil areas; management practices should be used as per soil type to balance between nitrogen use efficiency and N2O emission.

Nitrous oxide emissions and nitrogen use efficiency of manure and digestates applied to spring barley

2017 ◽  
Vol 239 ◽  
pp. 188-198 ◽  
Author(s):  
Khagendra R. Baral ◽  
Rodrigo Labouriau ◽  
Jørgen E. Olesen ◽  
Søren O. Petersen
Keyword(s):  
Nitrous Oxide ◽  
Nitrogen Use Efficiency ◽  
Spring Barley ◽  
Nitrous Oxide Emissions ◽  
Nitrogen Use ◽  
Use Efficiency

Nitrous oxide and nitric oxide emissions and nitrogen use efficiency as affected by nitrogen placement in lowland rice fields

2017 ◽  
Vol 110 (2) ◽  
pp. 277-291 ◽  
Author(s):  
Yam Kanta Gaihre ◽  
Upendra Singh ◽  
S. M. Mofijul Islam ◽  
Azmul Huda ◽  
M. R. Islam ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Nitrous Oxide ◽  
Nitrogen Use Efficiency ◽  
Rice Fields ◽  
Lowland Rice ◽  
Nitrogen Use ◽  
Nitric Oxide Emissions ◽  
Use Efficiency

scholarly journals Nitrogen-Use Efficiency, Nitrous Oxide Emissions, and Cereal Production in Brazil: Current Trends and Forecasts

PLoS ONE ◽  
2015 ◽  
Vol 10 (8) ◽  
pp. e0135234 ◽  
Author(s):  
Marcel Viana Pires ◽  
Dênis Antônio da Cunha ◽  
Sabrina de Matos Carlos ◽  
Marcos Heil Costa
Keyword(s):  
Nitrous Oxide ◽  
Nitrogen Use Efficiency ◽  
Nitrous Oxide Emissions ◽  
Nitrogen Use ◽  
Current Trends ◽  
Brazil Current ◽  
Cereal Production ◽  
Use Efficiency

scholarly journals Review of sustainability of average Nepalese subsistence farm in mid-hills of Nepal

2014 ◽  
Vol 15 ◽  
pp. 139-148 ◽  
Author(s):  
Tilak R Chaulagai
Keyword(s):  
Nitrogen Use Efficiency ◽  
Nitrogen Balance ◽  
Joint Venture ◽  
Farming System ◽  
Population Pressure ◽  
Nitrogen Use ◽  
Public And Private ◽  
Use Efficiency ◽  
Secondary Information ◽  
Public And Private Sector

The main aim of this paper is to depict the sustainability condition of an average subsistence farm in the mid-hill condition of Nepal. For the purpose, a hypothetical farm representing the average condition of the farming system in the area is taken. The analysis is based on the secondary information. For the purpose, only few indicators for the sustainability are analysed including gross profit margin, nitrogen use efficiency and nitrogen balance. The results reflect that an average subsistence farm in the midhill of Nepal earn just NRs 79,449 per annum. The nitrogen balance was negative and nitrogen use efficiency was more than 100% reflecting the system was economically and environmentally unsustainable. The problem behind unsustainability of the system is basically related with poverty and increased population pressure on poorly fertile land. Only a joint venture of public and private sector can address the problem.

scholarly journals Nitrogen use efficiency and N<sub>2</sub>O and NH<sub>3</sub> losses attributed to three fertiliser types applied to an intensively managed silage crop

2019 ◽  
Vol 16 (23) ◽  
pp. 4731-4745 ◽  
Author(s):  
Nicholas Cowan ◽  
Peter Levy ◽  
Andrea Moring ◽  
Ivan Simmons ◽  
Colin Bache ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Ammonium Nitrate ◽  
Nitrogen Use Efficiency ◽  
Passive Samplers ◽  
N2o Emissions ◽  
Urease Inhibitor ◽  
Nitrogen Use ◽  
Spatial And Seasonal Variation ◽  
Use Efficiency ◽  
Intensively Managed

Abstract. Three different nitrogen (N) fertiliser types, ammonium nitrate, urea and urea coated with a urease inhibitor (Agrotain®), were applied at standard rates (70 kg N ha−1) to experimental plots in a typical and intensively managed grassland area at the Easter Bush Farm Estate (Scotland). The nitrogen use efficiency of the fertilisers was investigated as well as nitrogen losses in the form of nitrous oxide fluxes (N2O) and ammonia (NH3) during fertilisation events in the 2016 and 2017 growing seasons. Nitrous oxide was measured by the standard static chamber technique and analysed using Bayesian statistics. Ammonia was measured using passive samplers combined with the Flux Interpretation by Dispersion and Exchange over Short Range (FIDES) inverse dispersion model. On average, fertilisation with ammonium nitrate supported the largest yields and had the highest nitrogen use efficiency, but as large spatial and seasonal variation persisted across the plots, yield differences between the three fertiliser types and zero N control were not consistent. Overall, ammonium nitrate treatment was found to increase yields significantly (p value < 0.05) when compared to the urea fertilisers used in this study. Ammonium nitrate was the largest emitter of N2O (0.76 % of applied N), and the urea was the largest emitter of NH3 (16.5 % of applied N). Urea coated with a urease inhibitor did not significantly increase yields when compared to uncoated urea; however, ammonia emissions were only 10 % of the magnitude measured for the uncoated urea, and N2O emissions were only 47 % of the magnitude of those measured for ammonium nitrate fertiliser. This study suggests that urea coated with a urease inhibitor is environmentally the best choice in regards to nitrogen pollution, but because of its larger cost and lack of agronomic benefits, it is not economically attractive when compared to ammonium nitrate.

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