Basalt addition improves the performance of young grassland monocultures under more persistent weather featuring longer dry and wet spells

Reynaert, Simon; Vienne, Arthur; Boeck, Hans J. De; D’Hose, Tommy; Janssens, Ivan A.; Nijs, Ivan; Portillo‐Estrada, Miguel; Verbruggen, Erik; Vicca, Sara; Poblador, Sílvia

doi:10.1016/j.agrformet.2023.109610

Cited by 5 publications

(1 citation statement)

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“…This may be achieved by applying crushed silicate rocks with a large reactive surface area to agricultural and forest soils (e.g., refs − ). Potential advantages and co-benefits of ERW include a low technological barrier to implementation at scale, , long-term storage of carbon compared to organic reservoirs (>10 000 years), − and a supply of key nutrients for crop growth. ,− Additionally, ERW feedstocks such as basalt may be used for the deacidification of soils, filling the role of agricultural lime (currently seen as a net source of CO 2 to the atmosphere − ). Our understanding of ERW has been improved by recent work on mechanistic modeling of weathering reactions in agricultural soils (e.g., refs , , , and ), modeling hydrological effects on weathering rates (e.g., ref ), laboratory and mesocosm experiments tracking uptake of nutrients by plants and feedstock dissolution rates (e.g., refs , , , and − ), and field experiments implementing ERW at scale (e.g., refs and − ).…”

Section: Introductionmentioning

confidence: 99%

Initial Validation of a Soil-Based Mass-Balance Approach for Empirical Monitoring of Enhanced Rock Weathering Rates

Reershemius,

Kelland,

Jordan

et al. 2023

Environ. Sci. Technol.

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Enhanced rock weathering (ERW) is a promising scalable and cost-effective carbon dioxide removal (CDR) strategy with significant environmental and agronomic co-benefits. A major barrier to large-scale implementation of ERW is a robust monitoring, reporting, and verification (MRV) framework. To successfully quantify the amount of carbon dioxide removed by ERW, MRV must be accurate, precise, and cost-effective. Here, we outline a mass-balance-based method in which analysis of the chemical composition of soil samples is used to track in situ silicate rock weathering. We show that signal-to-noise issues of in situ soil analysis can be mitigated by using isotope-dilution mass spectrometry to reduce analytical error. We implement a proofof-concept experiment demonstrating the method in controlled mesocosms. In our experiment, a basalt rock feedstock is added to soil columns containing the cereal crop Sorghum bicolor at a rate equivalent to 50 t ha −1 . Using our approach, we calculate rock weathering corresponding to an average initial CDR value of 1.44 ± 0.27 tCO 2 eq ha −1 from our experiments after 235 days, within error of an independent estimate calculated using conventional elemental budgeting of reaction products. Our method provides a robust time-integrated estimate of initial CDR, to feed into models that track and validate large-scale carbon removal through ERW.

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