Remineralizing soils? The agricultural usage of silicate rock powders: A review

Swoboda, Philipp; Döring, Thomas; Hamer, Martin

doi:10.1016/j.scitotenv.2021.150976

Cited by 92 publications

(84 citation statements)

References 151 publications

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“…Soils of the study area were derived from volcanic activities hence are rich in K and that could have led to the adequate K in the soils. This finding is consistent with the review of Swoboda et al (2022) about remineralizing soils, that concluded that parent materials exert great influence on the soil K availability. Calcium regulates how plants respond to endogenous stimuli and signals of stress (Lecourieux, 2006;Blanco et al, 2020).…”

Section: Exchangeable Potassium (K)supporting

confidence: 92%

Assessing spatial variability of selected soil properties in Upper Kabete Campus coffee farm, University of Nairobi, Kenya

Mwendwa

Mbuvi

Kironchi

et al. 2022

Heliyon

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Section: Exchangeable Potassium (K)supporting

confidence: 92%

Assessing spatial variability of selected soil properties in Upper Kabete Campus coffee farm, University of Nairobi, Kenya

Mwendwa

Mbuvi

Kironchi

et al. 2022

Heliyon

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“…Many silicates that can be used for ESW contain mineral nutrients that plants need to grow, including P, Mg, Ca, K, Fe, Zn, and Si. As a result, ESW can stimulate plant growth and increase crop yield (Battles et al, 2014; Haque, Chiang, et al, 2019; Kelland et al, 2020; Swoboda et al, 2021; Taylor et al, 2021; Van Straaten, 2006), although this is not always the case (Haque et al, 2020b; Swoboda et al, 2021; Wang, Wang, et al, 2018). Of particular importance might be the widely neglected supply of Si, which is considered a beneficial rather than an essential nutrient, although there is wide agreement and accumulating evidence that Si can induce a broad range of plant biotic and abiotic stress resistances (Epstein, 1999; Guntzer et al, 2012; Haynes, 2014).…”

Section: Impact Of Esw On Biotamentioning

confidence: 99%

Is the climate change mitigation effect of enhanced silicate weathering governed by biological processes?

Vicca

Goll

Hagens

et al. 2021

Global Change Biology

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A number of negative emission technologies (NETs) have been proposed to actively remove CO 2 from the atmosphere, with enhanced silicate weathering (ESW) as a relatively new NET with considerable climate change mitigation potential. Models calibrated to ESW rates in lab experiments estimate the global potential for inorganic carbon sequestration by ESW at about 0.5-5 Gt CO 2 year −1 , suggesting ESW could be an important component of the future NETs mix. In real soils, however, weathering rates may differ strongly from lab conditions. Research on natural weathering has shown that biota such as plants, microbes, and macro-invertebrates can strongly affect weathering rates, but biotic effects were excluded from most ESW lab assessments. Moreover, ESW may alter soil organic carbon sequestration and greenhouse gas emissions by influencing physicochemical and biological processes, which holds the potential to perpetuate even larger negative emissions. Here, we argue that it is likely that the climate change mitigation effect of ESW will be governed by biological processes, emphasizing the need to put these processes on the agenda of this emerging research field.

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“…The substantial nutrient release of the rock powders in the slurry is a relevant finding, since their dissolution rates are typically very low and are a major bottleneck to their usage [19,30]. The fine particle size of the rock powders (Table 1), and organic acids and microorganisms in the slurry likely contributed to the high nutrient release [31].…”

Section: Physicochemical Propertiesmentioning

confidence: 99%

“…Irrespective of the potential to reduce NH 3 emission from livestock manure, rock powders are gaining increased agronomic attention since they contain several macro-and micronutrients essential for plant growth and have thus been proposed as low-cost soil amendment [18,19]. This is particularly the case for highly weathered soils in tropical countries, where classical NPK fertilizers are often not affordable or accessible [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Importantly, such tropical soils are depleted in macro-and micronutrients, an escalating agronomic gap which neither classical NPK fertilizers nor liming can currently sufficiently address [23]. In tropical environments, rock powders could play an important role for sustainable agriculture, underpinned by accumulating evidence of their significant effects [19,24,25]. Also, there is a longstanding use of rock powders in organic agriculture and its ongoing expansion increases the demand of suitable nutrient sources that meet the organic grower's criteria [26].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Rock Powder Additions to Cattle Slurry on Ammonia and Greenhouse Gas Emissions

et al. 2021

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For several decades, farmers have been mixing rock powders with livestock slurry to reduce its NH3 emissions and increase its nutrient content. However, mixing rock powders with slurry is controversial, and there is currently no scientific evidence for its effects on NH3 and greenhouse gas (GHG) emissions or on changes in its nutrient content due to element release from rock powders. The major aim of this study was therefore to analyse the effects of mixing two commercially established rock powders with cattle slurry on NH3, CO2, N2O and CH4 emissions, and on nutrient release over a course of 46 days. We found that rock powders did not significantly affect CO2 emission rates. NH3 and N2O emission rates did not differ significantly up until the end of the trial, when the emission rates of the rock powder treatments significantly increased for NH3 and significantly decreased for N2O, respectively, which coincided with a reduction of the slurry crust. Cumulative NH3 emissions did not, however, differ significantly between treatments. Unexpected and significant increases in CH4 emission rates occurred for the rock powder treatments. Rock powders increased the macro- and micronutrient content of the slurry. The conflicting results are discussed and future research directions are proposed.

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Remineralizing soils? The agricultural usage of silicate rock powders: A review

Cited by 92 publications

References 151 publications

Assessing spatial variability of selected soil properties in Upper Kabete Campus coffee farm, University of Nairobi, Kenya

Assessing spatial variability of selected soil properties in Upper Kabete Campus coffee farm, University of Nairobi, Kenya

Is the climate change mitigation effect of enhanced silicate weathering governed by biological processes?

Effects of Rock Powder Additions to Cattle Slurry on Ammonia and Greenhouse Gas Emissions

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