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Potential use of bioenergy power plant residue biochar in mitigating N2O emission from acidic sandy loam soils: a comparative study

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Abstract

Nitrous oxide (N2O) emission from mustard (variety TS 38) field was estimated under the application of soil amendments for two consecutive years (November to February 2018 and 2019). Woodchip biochars obtained from a bioenergy power plant as bioenergy by-product (MWG), and conventional technique (MWC) were tested against farmyard manure (FYM), a commonly used soil organic amendment. N2O gas samples from mustard field was collected at ten-day intervals from sprouting of mustard seeds until harvest. Plant growth parameters were recorded at different crop growth stages whereas soil sampling and analysis were performed after harvest. Emission of N2O was found to be highest during flowering stage of the crop in all the treatments. Plots without soil amendment i.e. control (C) recorded 11.45 g ha−1 of N2O throughout the crop growing period. While, treatment IF (inorganically fertilized plots) emitted 29% higher (14.81 g ha−1) N2O as compared to control. Application of biochars MWC (treatment biochar conventional; BCC) and MWG (treatment biochar gasification; BCG) at a rate of 10 t ha−1 showed 23.4–52.13% lesser (BCC = 5.48 g ha−1, BCG = 8.77 g ha−1) N2O flux whereas, addition of FYM at the same dose was able to reduce it up to 9% (10.42 g ha−1). However, mixing of both the biochars with FYM improved this reduction upto 18% (BCCF = 9.34 g ha−1, BCGF = 10.06 g ha−1). Highest seasonal emission of N2O (14.81 g ha−1) under treatment IF leads to greater global warming potential (GWP) i.e. 4.41 kg CO2 eq. ha−1, which decreased to 1.63–2.61 kg CO2 eq. ha−1 under lone application of biochars (treatment BCC and BCG). Recorded GWP of FYM treated plots was 3.10 kg CO2 eq. ha−1. Significant (≤ 0.05) correlation was found between N2O flux with the pH and electrical conductivity (EC) of the applied amendments. Higher reduction in N2O emission, better improvement in soil quality and mustard yield under application of conventionally made biochar (MWC) as compared to bioenergy by-product biochar (MWG) and FYM indicates its better prospect in mitigating global warming potential from acidic sandy loam soil.

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Correspondence to Nirmali Gogoi.

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Chetia, J., Gogoi, N., Baruah, D.C. et al. Potential use of bioenergy power plant residue biochar in mitigating N2O emission from acidic sandy loam soils: a comparative study. Environmental Sustainability 4, 365–373 (2021). https://doi.org/10.1007/s42398-021-00169-7

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  • DOI: https://doi.org/10.1007/s42398-021-00169-7

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