Cited by 592Soil Carbon and Nitrogen DynamicsSoil and Water Nutrient DynamicsSoil erosion and sediment transport

Biochar, soil and land-use interactions that reduce nitrate leaching and N2O emissions: A meta-analysis

Open access
Borchard, Nils, Schirrmann, Michael, Cayuela, Maria Luz, Kammann, Claudia, Wrage-Mönnig, Nicole, Estavillo, Jose M., Fuertes-Mendizábal, Teresa, Sigua, Gilbert +3 more·2019·Science of The Total Environment

Abstract

Biochar can reduce both nitrous oxide (N 2 O) emissions and nitrate (NO 3-) leaching, but refining biochar's use for estimating these types of losses remains elusive. For example, biochar properties such as ash content and labile organic compounds may induce transient effects that alter N-based losses. Thus, the aim of this meta-analysis was to assess interactions between biochar-induced effects on N 2 O emissions and NO 3- retention, regarding the duration of experiments as well as soil and land use properties. Data were compiled from 88 peer-reviewed publications resulting in 608 observations up to May 2016 and corresponding response ratios were used to perform a random effects meta-analysis, testing biochar's impact on cumulative N 2 O emissions, soil NO 3- concentrations and leaching in temperate, semi-arid, sub-tropical, and tropical climate. The overall N 2 O emissions reduction was 38%, but N 2 O emission reductions tended to be negligible after one year. Overall, soil NO 3- concentrations remained unaffected while NO 3- leaching was reduced by 13% with biochar; greater leaching reductions (>26%) occurred over longer experimental times (i.e. >30 days). Biochar had the strongest N 2 O-emission reducing effect in paddy soils (Anthrosols) and sandy soils (Arenosols). The use of biochar reduced both N 2 O emissions and NO 3- leaching in arable farming and horticulture, but it did not affect these losses in grasslands and perennial crops. In conclusion, the time-dependent impact on N 2 O emissions and NO 3- leaching is a crucial factor that needs to be considered in order to develop and test resilient and sustainable biochar-based N loss mitigation strategies. Our results provide a valuable starting point for future biochar-based N loss mitigation studies.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1016/j.scitotenv.2018.10.060

Cites

95 of 96 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Overall, biochar leads to a reduction of nitrate leaching and N2O emissions.

    “The three cited reviews (Nguyen et al., 2017;Q. Liu et al., 2018;Borchard et al., 2019) agree that overall, biochar leads to a reduction of nitrate leaching and N 2 O emissions.”

    From Comparing straw, compost, and biochar regarding their suitability as agricultural soil amendments to affect soil structure, nutrient leaching, microbial communities, and the fate of pesticides (2021) · cites this paper as Borchard et al., 2019

    Section 3.1 reports a significant overall reduction in N2O emissions of 38%, but the overall effect on nitrate leaching was not statistically significant. Nitrate leaching fell significantly by 26–32% only in studies lasting more than 30 days, so the claim overstates the overall nitrate-leaching result. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Nitrogen leaching was significantly increased in sub-humid temperate climates, in Fluvisol and Luvisol soils, or when fertilizer N application rates exceeded 300 kg ha−1.

    “Specific cases where nitrogen leaching was significantly increased were found in sub-humid temperate climates, for Fluvisol and Luvisol soils or when fertilizer N application rates were above 300 kg ha -1 .”

    From Comparing straw, compost, and biochar regarding their suitability as agricultural soil amendments to affect soil structure, nutrient leaching, microbial communities, and the fate of pesticides (2021) · cites this paper as Borchard et al., 2019

    Section 3.4 reports 46% greater nitrate leaching with biochar at fertilizer rates above 300 kg N ha−1, but the discussion says the response at that rate was non-significant. Section 3.4 identifies Luvisols as typical of sub-humid temperate climates, but does not report significantly increased leaching in Luvisols or Fluvisols. The claim overstates the statistical significance and the soil-specific findings. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • The strongest reduction in N2O emissions was observed for paddy soils and sandy soils.

    “The strongest reduction in ­ N 2 O emissions was observed for paddy soils and sandy soils via meta-analysis (Borchard et al. 2019).”

    From Role of biochar toward carbon neutrality (2023) · cites this paper as Borchard et al. 2019

    The Conclusion reports nearly 40% lower N2O emissions in rice paddy soils, and §3.3 identifies soils with more than 70% sand as having the strongest reduction among soil textures (47%). But the paper does not identify paddy soils as having the strongest reduction overall: its discussion of soil types reports a 48% reduction in sandy Arenosols and a 47% reduction in Histosols. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Biochar produced from wood is the best candidate for N2O mitigation.

    “Biochar produced from wood is the best candidate (Borchard et al. 2019).”

    From Role of biochar toward carbon neutrality (2023) · cites this paper as Borchard et al. 2019

    Section 3.2 (lines 190–195) reports that wood-derived biochar reduced soil N2O emissions under specified production methods. It also reports reductions for non-woody lignocellulosic biochar and does not identify wood as the best candidate, so the superlative is unsupported. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • The effectiveness of biochar for N2O mitigation would remain effective only in the first year of biochar application.

    “The meta-analysis by Borchard et al. (2019) suggested that the effectiveness would remain effective only in the first year of biochar application.”

    From Role of biochar toward carbon neutrality (2023) · cites this paper as Borchard et al. (2019)

    Section 3.1 reports that biochar-induced N2O reductions were transient and tended to become negligible within one year. This supports the claim’s general timing, but not a categorical cutoff at the end of the first year for every application. (LLM, conf=0.85)

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 8

  1. Downie, A., Crosky, A., Munroe, P. (2009): Physical properties of biochar, in: Lehmann, J., Joseph, S. D. (eds.): Biochar for Environmental Management -Science and Technology. earthscan, London, pp. 13-32.
  2. Eitelberg, D. A., Jasper, V., H., V. P. (2014): A review of global potentially available cropland estimates and their consequences for model-based assessments. Glob. Chang. Biol. 21, 1236-1248.
  3. Harter, J., Guzman-Bustamante, I., Kuehfuss, S., Ruser, R., Well, R., Spott, O., Kappler, A., Behrens, S. (2016): Gas entrapment and microbial N2O reduction reduce N2O emissions from a biochar-amended sandy clay loam soil. Sci. Rep. 6, 1-15, doi:10.1038/srep39574 570 · DOI
  4. IPCC (2013): Climate Change 2013: The physical science basis. Contribution of working group I to the fifth assessment report of the Intergovernmental Panel on Climate Change. Intergovernmental Panel on Climate Change (IPCC), Cambridge and New York.
  5. Behrens, S. (2016): Gas entrapment and microbial N2O reduction reduce N2O emissions from a biochar-amended sandy clay loam soil. Sci. Rep. 6, 1-15, doi: 10.1038/srep39574 · DOI
  6. Lambin, E. F., Meyfroidt, P. (2011): Global land use change, economic globalization, and the looming land scarcity. Proc. Natl. Acad. Sci. 108, 3465 LP-3472.
  7. Lehmann, J., Rillig, M. C., Thies, J., Masiello, C. A., Hockaday, W. C., Crowley, D. (2011): Biochar effects on soil biota -A review. Soil Biol. Biochem. 43, 1812-1836.
  8. Tan, Z., Zou, J., Zhang, L., Huang, Q. (2017): Morphology, pore size distribution, and nutrient characteristics in biochars under different pyrolysis temperatures and atmospheres, Journal of Material Cycles and Waste Management.

Cited by

Sorted by citations

Authors
Borchard, N., Schirrmann, M., Cayuela, M. L., Kammann, C., Wrage-Mönnig, N., Estavillo, J. M., Fuertes-Mendizábal, T., Sigua, G., Spokas, K., Ippolito, J. A., & Novak, J.
Affiliations
  • Natural Resources Institute Finland (FI)
  • Leibniz Institute for Agricultural Engineering and Bioeconomy (DE)
  • Hochschule Geisenheim University (DE)
  • Agricultural Research Service (US)
  • University of Minnesota (US)
  • Colorado State University (US)
Corresponding author
Borchard, Nils
Venue
Science of The Total Environment
Publisher
Elsevier BV
Published
2019-02
Volume
651
Issue
Pt 2
Pages
2354-2364
ISSN
0048-9697 (ISSN-L)
OpenAlex
W2897569712
Cited by
592
References
96
Citations by year
2026: 76 · 2025: 86 · 2024: 81 · 2023: 93 · 2022: 95 · 2021: 76 · 2020: 51 · 2019: 32
FWCI
3.96
Type
journal article
Language
en
Open access
Locations
  • The Science of The Total Environment (acceptedVersion)
  • PubMed (publishedVersion)
  • CGSPace A Repository of Agricultural Research Outputs (Consultative Group for International Agricultural Research) (submittedVersion)
  • Jukuri (Natural Resources Institute Finland (Luke)) (submittedVersion)
Funders
  • USDA (6657-12130-002-08I)
  • Ministry of Economy and Competitiveness
  • Fundación Séneca (19281/PI/14)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Soil and Water Nutrient Dynamics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil erosion and sediment transport
Keywords
biochar, nitrous oxide emissions, nitrate leaching, soil nitrogen retention, land use, paddy soil, sandy soil, arable farming, horticulture, grassland, perennial crops, nitrogen loss reduction, soil organic carbon, ash content, experimental duration

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review