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Highly weathered tropical soils exhibit low retention of basic cations (Ca2⁺, Mg2⁺, K⁺), reduced effective charge balance, toxicity due to exchangeable Al, and strong dependence on imported chemical fertilizers. Soil remineralizers derived from quartz and agate mining (containing secondary minerals) < 2 mm particle size, after undergoing mechanical grinding, transform an environmental liability into sustainable inputs, releasing nutrients and improving soil structure [1]. Although porous and chemical alterations have been reported in isolation, the soil interactions between microporous reconfiguration, cationic replacement, and physicochemical conditioning remain poorly understood [2; 3]. This study evaluated the porous matrix reconfiguration induced by cumulative doses of basalt powder (soil remineralizer) in a dystrophic red latosol; the change optimized the reactive transport of cations. The experiment used a randomized block design (n=24; 6 treatments x 4 replications), in 5L pots of Tifton 85 grass culture, in a greenhouse, for 162 days (4 applications) of doses: T0 (0), T1 (8), T2 (16), T3 (32), T4 (64), T5 (128 t ha-1). Analyses: bulk density (Dap) and total/microporous porosity by undisturbed cylinders (0-5cm); pH (H₂O), exchangeable Al and Mehlich-1 base saturation [4]; ANOVA, regression (α 0.05). Treatment T4 (64 t ha⁻¹) optimized the physicochemical synergy: bulk density decreased by 3% (1.40 to 1.36 Mg m⁻³), porosity increased by 4% (0.46 to 0.48 cm³ cm⁻³), and microporosity increased by 18% (0.22 to 0.26 cm³ cm⁻³). Concomitantly, pH (H₂O) increased (4.86 to 5.3), exchangeable Al decreased (0.12 cmol_c dm⁻³), and base saturation increased substantially. Enhanced microporosity expanded soil-water-mineral interfaces, catalyzing basaltic dissolution of the soil remineralizer and replacement of exchangeable Al by Ca2⁺, Mg2⁺, and K⁺, favoring reactive transport in acidic soils. Soil remineralizer, derived from quartz and agate mining basalt, demonstrates potential for sustainable agriculture (SDGs 2, 12, 13), reducing dependence on synthetic fertilizers.
| References | [1] KORCHAGIN, J. Mineralogical, chemical and physical criteria for agronomic use of hydrothermally treated basalt powder in southern Brazil. 2018. PhD Thesis, University of Passo Fundo, Passo Fundo. https://repositorio.upf.br/handle/123456789/9254 [2] SINGH, N., et al., 2021. X-ray micro-computed tomography characterized soil pore network as influenced by long-term application of manure and fertilizer. Geoderma 385, 114872. https://doi.org/10.1016/j.geoderma.2020.114872 [3] TANG, X., 2025. Enhanced basalt weathering for CO₂ sequestration: Phase dissolution rates, carbon sequestration mechanisms and practical application. Environmental Research 276, 121492. https://doi.org/10.1016/j.envres.2025.121492 [4] TEDESCO, J.M. et al., 1995. Soil, plant and other materials analysis. 2nd ed. Porto Alegre, RS: Federal University of Rio Grande do Sul, 1995. 174p. |
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| Country | Brazil |
| Green Housing & Porous Media Focused Abstracts | This abstract is related to Green Housing |
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