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

Francisco S. M. Araujo, Andrea G. M. Chacon, Raphael F. Porto, Jaime P. L. Cavalcante, Yi Wai Chiang and Rafael M. Santos ()
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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
Raphael F. Porto: School of Engineering, University of Guelph, Guelph, ON N1G 2W1, Canada
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

Land, 2024, vol. 13, issue 11, 1-25

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.

Keywords: liming; ERW; agricultural index; acid digestion; climate change; sustainable agriculture (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2024
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