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Adapting and Verifying the Liming Index for Enhanced Rock Weathering Minerals as an Alternative Liming Approach

Author

Listed:
  • Francisco S. M. Araujo

    (School of Engineering, University of Guelph, Guelph, ON N1G 2W1, Canada)

  • Andrea G. M. Chacon

    (School of Engineering, University of Guelph, Guelph, ON N1G 2W1, Canada
    Faculdad de Ingenieria, Universidad de La Sabana, Chía 140013, Colombia)

  • Raphael F. Porto

    (School of Engineering, University of Guelph, Guelph, ON N1G 2W1, Canada
    Chemical Engineering, Federal University of Rio de Janeiro, Rio De Janeiro 21941-909, RJ, Brazil)

  • Jaime P. L. Cavalcante

    (Department of Natural Sciences, Federal University of Pernambuco, Recife 50670-901, PE, Brazil)

  • Yi Wai Chiang

    (School of Engineering, University of Guelph, Guelph, ON N1G 2W1, Canada)

  • Rafael M. Santos

    (School of Engineering, University of Guelph, Guelph, ON N1G 2W1, Canada)

Abstract

Acidic soils limit plant nutrient availability, leading to deficiencies and reduced crop yields. Agricultural liming agents address these issues and are crucial for deploying silicate amendments used in enhanced rock weathering (ERW) for carbon sequestration and emission reduction. Grower recommendations for liming agents are based on the liming index (LI), which combines the neutralizing value (NV) and fineness rating (FR) to predict a mineral’s acidity neutralization relative to pure calcite. However, the LI was originally developed for carbonate minerals, and its applicability to silicates remains uncertain, with studies often yielding inconclusive results on soil carbon and liming efficiency. This study aims to evaluate the liming efficiency of silicates. We determined the LI of five candidate ERW minerals (basalt, olivine, wollastonite, kimberlite, and montmorillonite) and compared them to pure calcite. Post-NV acid digestion, we characterized the minerals and soils, applying nonparametric statistical tests (Wilcoxon, Kendall) to correlate liming results with LI, dosage, and amendment methods. We developed an empirical model incorporating mineralogy and kinetics to explain silicate behavior in liming, considering soil, climate, and crop factors.

Suggested Citation

  • Francisco S. M. Araujo & Andrea G. M. Chacon & Raphael F. Porto & Jaime P. L. Cavalcante & Yi Wai Chiang & Rafael M. Santos, 2024. "Adapting and Verifying the Liming Index for Enhanced Rock Weathering Minerals as an Alternative Liming Approach," Land, MDPI, vol. 13(11), pages 1-25, November.
    • Handle: RePEc:gam:jlands:v:13:y:2024:i:11:p:1839-:d:1514407
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    References listed on IDEAS

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    1. David J. Beerling & Euripides P. Kantzas & Mark R. Lomas & Peter Wade & Rafael M. Eufrasio & Phil Renforth & Binoy Sarkar & M. Grace Andrews & Rachael H. James & Christopher R. Pearce & Jean-Francois , 2020. "Potential for large-scale CO2 removal via enhanced rock weathering with croplands," Nature, Nature, vol. 583(7815), pages 242-248, July.
    2. Md Shawon Mahmud & Khim Phin Chong, 2022. "Effects of Liming on Soil Properties and Its Roles in Increasing the Productivity and Profitability of the Oil Palm Industry in Malaysia," Agriculture, MDPI, vol. 12(3), pages 1-14, February.
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