Reuse of straw in the form of hydrochar: Balancing the carbon budget and rice production under different irrigation management
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View abstract on PubMed
Summary
This summary is machine-generated.Controlled irrigation and hydrochar application in rice paddies can reduce greenhouse gas (GHG) emissions and improve carbon sequestration, offering a sustainable organic fertilizer option.
Area Of Science
- Agricultural Science
- Environmental Science
- Soil Science
Background
- Hydrochar is a proposed climate-friendly organic fertilizer for paddy cultivation.
- Its impact on greenhouse gas (GHG) emissions, net ecosystem carbon budget (NECB), net global warming potential (net GWP), and GHG emission intensity (GHGI) requires further investigation.
Purpose Of The Study
- To compare the effects of exogenous organic carbon (EOC) application, specifically rice straw and hydrochar, on GHG emissions under different irrigation methods.
- To evaluate the influence of these treatments on NECB, net GWP, and GHGI in rice production.
Main Methods
- A two-year rice pot experiment was conducted.
- Treatments included flooding irrigation (FI) and controlled irrigation (CI) with exogenous organic carbon (EOC) amendments (rice straw and hydrochar).
- Measurements included GHG emissions (CH4, N2O, CO2), crop yield, NECB, net GWP, and GHGI.
Main Results
- Controlled irrigation (CI) significantly altered GHG emissions, increasing ecosystem respiration and N2O but decreasing CH4 compared to FI.
- CI reduced net GWP by 16-220% due to CH4's higher contribution to GWP.
- Hydrochar application, especially with CI, showed potential for reduced net GWP and GHGI compared to rice straw, and improved NECB and SOC sequestration over time.
Conclusions
- Integrated controlled irrigation and hydrochar practices offer a sustainable and eco-friendly approach to organic waste management in rice production.
- This approach can enhance the net ecosystem carbon budget and soil organic carbon sequestration.
- Hydrochar amendment, under controlled irrigation, can offset carbon emissions from organic inputs and reduce overall GHG emissions intensity.
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