Possibilities of using silicate rock powder: An overview

Ramos, Claudete Gindri; Hower, James C.; Blanco, Erika; Oliveira, Marcos L.S.; Theodoro, Suzi Huff

doi:10.1016/j.gsf.2021.101185

Cited by 54 publications

(24 citation statements)

References 127 publications

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“…The weathering of these minerals can be accelerated by incorporation into soils through the action of soil acids as well as root exudates and biologic activity in the rhizosphere (Harley and Gilkes 2000;Violante and Caporale 2015;Gunnarsen et al 2022). Though the fertilizing effect of the application of local minerals at lower application rates has been extensively studied in Brazil (Manning and Theodoro 2020;Ramos et al 2021), to date there have only been a limited number of studies examining the degree to which large applications of silicate minerals aimed at sequestering CO 2 through enhanced weathering will improve crop yields (Haque et al 2019(Haque et al , 2020bKelland et al 2020;Jariwala et al 2022). Any added crop value would both provide profits for farmers and compensate for some of the total cost of CO 2 uptake.…”

Section: Introductionmentioning

confidence: 99%

Greenlandic glacial rock flour improves crop yield in organic agricultural production

Gunnarsen

Jensen

Rosing

et al. 2023

Nutr Cycl Agroecosyst

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The application of mechanically crushed silicate minerals to agricultural soils has been proposed as a method for both improving crop yields and sequestering inorganic carbon through enhanced mineral weathering. In Greenland, large quantities of finely grained glacial rock flour (GRF) are naturally produced by glacial erosion of bedrock and deposited in easily accessible lacustrine and marine deposits, without the need for energy-intensive grinding. To determine if this material can improve crop yields, we applied 10 and 50 t GRF ha−1 to a sandy, organic agricultural field in Denmark. Two field trials were carried out to test the first-year yield response to GRF in both maize and potatoes, residual effects on potato yields in the year after application, and second and third-year residual effects on spring wheat. Reference-K treatments were included for comparison to determine if the beneficial effects of GRF were primarily due to its K content (3.5% K2O). This alternative source of silicate minerals improved crop yields in the year of application. Though there was no improvement in yield with the reference-K treatments, for each additional ton of GRF applied, maize dry yield increased by 59 kg ha−1 and potato tuber yield by an additional 90 kg ha−1. No residual effects on crop yields were observed in the following years, but we suspect that benefits might persist over multiple seasons at sites with lower initial fertility. The increase in yields achieved with GRF could offset some of the costs of applying silicate minerals as a CO2 sequestration scheme.

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Section: Introductionmentioning

confidence: 99%

Greenlandic glacial rock flour improves crop yield in organic agricultural production

Gunnarsen

Jensen

Rosing

et al. 2023

Nutr Cycl Agroecosyst

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“…In addition to pH controls, explicitly measuring exchange complex ions, changes in cation exchange capacity, and macro-and micronutrient pools can help identify ancillary EW effects beyond CDR, allowing for monitoring of both beneficial nutrients and potentially toxic trace metals (Ramos et al, 2022). In agricultural systems, the added step of quantifying trace metal or nutrient content of plant biomass may be relevant for assessing bioavailability of rock-derived ions, whether beneficial or detrimental, and may be quantified using acid digestion of dried plant biomass coupled with ICP-AES, ICP-MS, or AAS for elemental quantification (Ten Berge et al, 2012).…”

Section: Tracing Weathering Productsmentioning

confidence: 99%

Methods for determining the CO2 removal capacity of enhanced weathering in agronomic settings

et al. 2022

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Recent analysis by the IPCC suggests that, across an array of scenarios, both GHG emissions reductions and various degrees of carbon removal will be required to achieve climate stabilization at a level that avoids the most dangerous climate changes in the future. Among a large number of options in the realm of natural climate solutions, atmospheric carbon dioxide removal (CDR) via enhanced silicate weathering (EW) in global working lands could, in theory, achieve billions of tons of CO2 removal each year. Despite such potential, however, scientific verification and field testing of this technology are still in need of significant advancement. Increasing the number of EW field trials can be aided by formal presentation of effective study designs and methodological approaches to quantifying CO2 removal. In particular, EW studies in working lands require interdisciplinary “convergence” research that links low temperature geochemistry and agronomy. Here, drawing on geologic and agronomic literature, as well as demonstration-scale research on quantifying EW, we provide an overview of (1) existing literature on EW experimentation as a CO2 removal technique, (2) agronomic and geologic approaches to studying EW in field settings, (3) the scientific bases and tradeoffs behind various techniques for quantifying CO2 removal and other relevant methodologies, and (4) the attributes of effective stakeholder engagement for translating scientific research in action. In doing so, we provide a guide for establishing interdisciplinary EW field trials, thereby advancing the verification of atmospheric CO2 in working lands through the convergence of geochemistry and agronomy.

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“…In contrast, addressing tropical conditions, experiments carried out using oxisols (in which silicate minerals are inherently unstable) typically show benefits for crop growth due to the addition of silicate minerals and rocks (e.g. Ramos et al, 2020Ramos et al, , 2022.…”

Section: Demonstrating That These Processes Take Placementioning

confidence: 99%

Mineral stabilities in soils: how minerals can feed the world and mitigate climate change

Manning

2022

Clay miner.

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Possibilities of using silicate rock powder: An overview

Cited by 54 publications

References 127 publications

Greenlandic glacial rock flour improves crop yield in organic agricultural production

Greenlandic glacial rock flour improves crop yield in organic agricultural production

Methods for determining the CO2 removal capacity of enhanced weathering in agronomic settings

Mineral stabilities in soils: how minerals can feed the world and mitigate climate change

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