A method to determine the soil bulk density of undisturbed samples with non-isodiametric shape

Freitas, Karllas Stival; Armindo, Robson André; Pires, Luiz F.; Filho, Vitoldo Swinka; Júnior, Sebastião Ribeiro Xavier

doi:10.1016/j.still.2019.04.007

Cited by 8 publications

(3 citation statements)

References 34 publications

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“…In each of the zones two soil samples were simultaneously collected using a grid sampling techniue at the same locations where the waste samples were collected from depths of 0-15 cm and 16-30 cm using the handheld soil auger. These soil samples were bulked together and thoroughly homogenised to generate composite soil samples for all the sample sites (Freitas et al 2019). Also, air samples for each site were also obtained in the mornings and evenings, i.e.…”

Section: Methodsmentioning

confidence: 99%

Spatial assessment of pollutants concentration in air and soils impacted by industrial wastes in lagos state, Nigeria

Ozabor,

Wekpe,

Tega

et al. 2024

Environ. Res. Commun.

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The mega city of Lagos, Nigeria is plagued by various environmental issues, chief amongst them being environmental pollution induced by poor and disjointed urban industrial waste management practices. This study aimed to identify and quantify the types of urban industrial waste generated in Lagos State. The State plays host to the largest population base in Nigeria with over twenty million people. The study adopted a quasi-experimental design. Soil, industrial waste generation and pollutant levels were determined with the aid of a thermal mass gas flow meter. Industrial wastes were measured in situ using a weighting scale, while surface soil samples were collected at depths of 0–30 cm. Results show that 20% of the industrial waste generated in the metropolis was ignitable (possibility of spontaneous combustion). The results were thereafter compared with international standards on the permissible limits for various pollutants in air and soil of Lagos State. Ikorodu had the greatest contribution of industrial waste generated in Lagos, followed by Ikeja, Oshodi, Ojo/Alaba and Surulere. The implications of these results and findings is that a lot needs to be done in terms of appropriate legislation, enforcement and tracking of industrial waste generation in Lagos State for effective monitoring and implementation of management strategies.

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Section: Methodsmentioning

confidence: 99%

Spatial assessment of pollutants concentration in air and soils impacted by industrial wastes in lagos state, Nigeria

Ozabor,

Wekpe,

Tega

et al. 2024

Environ. Res. Commun.

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“…Soil compaction limits the soil depth and volume explored by roots and, consequently, the uptake of water and nutrients (Chen et al., 2014). Trampling of the soil by grazing animals can negatively affect the structure of the topsoil by increasing bulk density and decreasing macroporosity and total porosity (Auler et al., 2014, 2017; Freitas et al., 2019; Moraes et al., 2014; Tuffour & Bonsu, 2014). Soil compaction by machine traffic during sowing, phytosanitary treatments, and harvest can increase the bulk density of soil at depths of 0.07–0.2 m, impairing the root growth and development of crops in succession (Costa et al., 2015; Reichert et al., 2009; Spera et al., 2006).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the influence of surface and subsurface acidity correction methodologies on soil compaction in agropastoral systems under no‐till

Barbosa Borges,

Hipólito,

Piantra

et al. 2024

Soil Science Soc of Amer J

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Surface and subsurface acidity and soil compaction restrict root exploration and impair crop yields in agropastoral systems under no‐till. To support the development of surface and subsurface acidity correction methodologies that can decrease soil compaction in agropastoral systems under no‐till, this study tested the following hypotheses: (a) the incorporation of limestone with plowing and harrowing (conventional tillage) for surface and subsurface acidity correction decreases soil compaction in agropastoral systems under no‐till, (b) the subsurface application of hydrated lime with a shank subsoiler‐fertilizer (minimum tillage) for surface and subsurface acidity correction decreases soil compaction in agropastoral systems under no‐till, and (c) the surface application of Ca compounds (no tillage) for surface and subsurface acidity correction increases soil compaction in agropastoral systems under no‐till. In a field experiment in an agropastoral system under no‐till in an Arenic Hapludalf in Brazil, the abilities of three application management methodologies (no tillage, conventional tillage, and minimum tillage) for three Ca compounds (limestone, phosphogypsum, and hydrated lime) to ameliorate acidity in the surface and subsurface layers and decrease soil compaction were evaluated. The experimental design was a randomized complete block with four replications. The results support the following conclusions: (a) the incorporation of limestone with plowing and harrowing does not decrease soil compaction in agropastoral systems under no‐till; (b) the subsurface application of hydrated lime with a shank subsoiler‐fertilizer does not decrease soil compaction in agropastoral systems under no‐till; and (c) the surface application of limestone does not increase soil compaction in agropastoral systems under no‐till.

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“…Sousa et al gave the column test results on large undisturbed samples [11]. Freitas et al introduced the coefficient of pore expansion to correct the possible differences in measuring the total pore volume under dry or water-saturated conditions [12]. Xu et al proposed a new method for measuring the preconsolidation pressure of structural loess soil [13].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Triaxial Test of Undisturbed and Remolded Loess

Zhang

Liang

Zheng

et al. 2022

Mathematical Problems in Engineering

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The difference of sample preparation methods will directly lead to the difference of the structure of the sample, and the mechanical response characteristics under external load will be different. Based on the conventional tests such as particle analysis, specific gravity, critical moisture content, and consolidation test of undisturbed loess from Xi’an, this paper focuses on the static triaxial consolidated drained shear and consolidated undrained shear tests on undisturbed and remolded loess. The results show that: (1) the structure has an obvious influence on the stress-strain relationship of the sample, the stress-strain curve of the undisturbed sample is a strain softening curve, and the stress-strain curve of the remolded sample is a weak strain hardening curve; (2) under the same loading conditions, the triaxial shear strength of the undisturbed soil is significantly higher than that of the remolded soil; (3) the change rule of the consolidation ratio of undisturbed and remolded samples is basically the same, but the final consolidation ratio of remolded soil is greater than that of undisturbed soil.

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A method to determine the soil bulk density of undisturbed samples with non-isodiametric shape

Cited by 8 publications

References 34 publications

Spatial assessment of pollutants concentration in air and soils impacted by industrial wastes in lagos state, Nigeria

Spatial assessment of pollutants concentration in air and soils impacted by industrial wastes in lagos state, Nigeria

Evaluation of the influence of surface and subsurface acidity correction methodologies on soil compaction in agropastoral systems under no‐till

Comparative Study on Triaxial Test of Undisturbed and Remolded Loess

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