The effect of biochar-amended biogas digestate on soil nitrous oxide emissions of long-term reduced tillage under varying soil moisture
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
View abstract on PubMed
Summary
This summary is machine-generated.Reduced tillage and biochar can lower nitrous oxide (N2O) emissions from fertilized soil. Reduced tillage significantly cut N2O, especially in drier conditions, while biochar further reduced emissions in wetter conditions when combined with reduced tillage.
Area Of Science
- Agricultural Science
- Soil Science
- Environmental Science
Background
- Elevated nitrous oxide (N2O) emissions from biogas digestate fertilization challenge sustainable agriculture.
- Reduced tillage (RT) and biochar are proposed sustainable soil management practices, but their impact on N2O emissions requires further investigation.
- Understanding the mechanisms behind N2O emissions under these practices is crucial for effective mitigation strategies.
Purpose Of The Study
- To investigate the effects of reduced tillage (RT) legacy and biochar amendment on N2O emissions from digestate-fertilized soil.
- To analyze the influence of soil moisture conditions on N2O production pathways under these sustainable practices.
- To quantify the mitigation potential of RT and biochar for N2O emissions in agricultural systems.
Main Methods
- A 36-day greenhouse pot experiment was conducted using soils from a long-term tillage field.
- Treatments included no fertilization (N0), biogas digestate-only (BD), and digestate with biochar (BDBC).
- Gaseous fluxes (N2O, NH3, CO2), soil water content, mineral nitrogen dynamics, and plant nitrogen uptake were monitored.
Main Results
- Two distinct N2O emission peaks were observed, correlated with specific water-filled pore space (WFPS) ranges (35-45% and 50-65%).
- Reduced tillage (RT) significantly decreased cumulative N2O emissions by 35% compared to conventional tillage (CT), primarily during the first peak (lower WFPS).
- Biochar amendment did not significantly alter cumulative N2O emissions but reduced emissions during the second peak (higher WFPS), especially in conjunction with RT.
Conclusions
- Both reduced tillage legacy and biochar amendment show potential for mitigating N2O emissions from biogas digestate-fertilized soils.
- The effectiveness of these practices is influenced by soil moisture conditions, with RT being more effective at lower WFPS and biochar at higher WFPS.
- Integrated application of RT and biochar may offer synergistic benefits for reducing N2O emissions under specific soil moisture regimes.
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
Related Concept Videos
Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.