Functionality of the porous network of Bt horizons of soils with and without cohesive character

Menezes, Ademir Silva; Alencar, Thiago Leite de; Júnior, Raimundo Nonato Assis; Romero, Ricardo Espíndola; Costa, Mírian Cristina Gomes; Cooper, Miguel; Mota, Jaedson Claúdio Anunciato

doi:10.1016/j.geoderma.2017.11.005

Cited by 14 publications

(17 citation statements)

References 21 publications

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“…Such inverse relationship between bulk density and air permeability is also found in soils that have B t horizons with cohesive character, which are less functional than those having B t horizons without cohesive character, with lower air permeability, pore length and connectivity. Regardless of how well the pores are oriented, the highest percentage of blocked pores, i.e., those which do not contribute to air flow, occurs in horizons with cohesive character (Menezes et al, 2018). (Figure 7).…”

Section: Resultsmentioning

confidence: 99%

“…Pore-size distribution, tortuosity and connectivity are the characteristics of the porous space geometry that most influence the transport of fluids in soil (Iversen, Moldrup, Schjønning, & Loll, 2001;Tuli, Hopmans, Rolston, & Moldrup, 2005;Chief, Ferré, & Nijssen, 2006), whereas viscosity is the relevant attribute which characterizes the studied fluid (Libardi, 2012). Thus, soils with high K air have greater capacity to exchange gases with the atmosphere, i.e., they have better aeration (Menezes et al, 2018). This is important because higher relative concentration of CO 2 in soil, to the detriment of O 2 , due to metabolic activities of roots and soil biota, may compromise the yields of agricultural crops, when air renewal in soil is limited.…”

Section: Introductionmentioning

confidence: 99%

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Actual and Relative Soil Air Permeability as Soil Physical Quality Index

Carvalho¹,

Brito²,

Matos³

et al. 2019

JAS

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Developing indices to evaluate soil physical quality can facilitate diagnosis and decision-making. In this context, intrinsic soil air permeability (Kair) is a physical parameter very sensitive to structural changes due to soil management. However, it is important to establish a standard Kair, considering a reference soil physical state. Thus, the present study proposes to create an index called relative soil air permeability (Kairr), taking as reference the physical state of maximum bulk density, obtained by normal Proctor test. Kairr is the ratio between compacted soil air permeability (Kairc) and actual soil air permeability (Kair). Kairr was evaluated using disturbed and undisturbed samples of a Latossolo and a Planossolo. The experimental design was completely randomized, with four treatments (T1-Latossolo 0-0.1 m; T2-Latossolo 0.1-0.2 m; T3-Planossolo 0-0.1 m and T4-Planossolo 0.1-0.2 m) and eight replicates. Kairr was equal to 0.1032 and 0.3547 in the Latossolo and to 0.4115 and 0.1923 in the Planossolo, in the 0-0.1 and 0.1-0.2 m layers, respectively. These characteristic values observed in both soils and layers are due to the management adopted in the area. In Latossolo, the use of medium harrow has made the 0.1-0.2 m layer more restrictive to air movement, whereas the Planossolo showed lower values of relative soil air permeability in the 0-0.1 m layer due to animal grazing, which has greater impact on the superficial portion of the soil.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Actual and Relative Soil Air Permeability as Soil Physical Quality Index

Carvalho¹,

Brito²,

Matos³

et al. 2019

JAS

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“…SWRC can be obtained through various methods, in the field and laboratory. However, it is usually determined under laboratory conditions using the porous plate apparatus, proposed by Richards and Fireman (1943), in which the water content retained in the sample under the applied pressure originates the curve (Menezes et al, 2018). SWRC shape is commonly described by an empirical equation and the model of van Genuchten (1980), with five parameters, is the most used for this purpose, because it fits to a wide variety of soils (Xiang-Wei et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Estimation of van Genuchten Equation Parameters in Laboratory and through Inverse Modeling with Hydrus-1D

Nascimento¹,

Júnior²,

Araújo³

et al. 2018

JAS

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Soil water retention curve (SWRC) becomes important because it guides when and how much to irrigate, optimizing the use of water; can be obtained in the field or laboratory, being commonly determined in the laboratory with porous plate apparatus, and the determination is compromised by issues such as time and labor. In this context, inverse modeling emerges, which allows to obtain a variable going from the effect to the cause, using Hydrus-1D. Hence, this study aims to obtain van Genuchten equation parameters through inverse modeling with Hydrus-1D and make the respective comparisons and inferences. Matric potential data were obtained over time in an instantaneous profile-type experiment. Six sets of three tensiometers each were installed surrounding the center of the experimental plot, at depths of 0.20, 0.35 and 0.50 m. Target depth was 0.35 m, where the roots of most crops are concentrated, and the other tensiometers were used to obtain the potential gradient. Matric potential data were used to feed Hydrus-1D and obtain the van Genuchten equation parameters. Laboratory curves were obtained using porous plate apparatus, with four replicates. It was concluded that, in general, the Hydrus-1D model estimates van Genuchten equation parameters and, consequently, the SWCC of an Argissolo more consistently with field conditions than those obtained in the laboratory; and, provided it is fed with field data, the Hydrus-1D simulates well the behavior of matric potential and moisture over time, reducing the time and labor in the procedures to obtain van Genuchten equation parameters in the laboratory.

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“…Water retention in the soil is represented by the water retention curve (MENEZES et al, 2018), which describes the amount of water retained in the soil in equilibrium at a given matric potential and is considered an important tool in the study of soils attributes (MELO et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Behavior of water in soil cultivated with sunflower under water stress

Filho

Menezes

Neto

et al. 2018

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Various soil attributes allow inferring about their behavior and function in the environment. With this work, the objective was to analyze the behavior of water retention in the soil after irrigation suppression for the BRS 323 hybrid sunflower cultivation in a sandy loam soil. The experiment was conducted at the Agrometeorological Station of the Federal University of Ceará, Brazil, from August to November, 2015. The behavior of soil water was evaluated by means of the retention curve, available water content, grain size, total porosity, and soil particle density in the 0.0 to 0.20 m soil layer. The water in the depth of 0.0-0.10 m drains rapidly in relation to the 0.10-0.20 m depth between potentials from-0.1 to-1.500 kPa after irrigation suppression, in this depth, at-4 kPa, there was greater water retention along the curve. The maximum water retained in the soil at field capacity in the layer depths of 0.0-0.10 m and 0.10-0.20 m is: 0.195 cm 3 cm-3 and 0.221 cm 3 cm-3 , respectively. The 0.10-0.20 m depth presented a larger volume of available water influenced by density and porosity. It was concluded that the water in the soil cultivated with sunflower, 80 days after the irrigation ceases, gradually drains into larger pores, then retained in the smaller pores, being limited to the plants in the soil layer.

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Functionality of the porous network of Bt horizons of soils with and without cohesive character

Cited by 14 publications

References 21 publications

Actual and Relative Soil Air Permeability as Soil Physical Quality Index

Actual and Relative Soil Air Permeability as Soil Physical Quality Index

Estimation of van Genuchten Equation Parameters in Laboratory and through Inverse Modeling with Hydrus-1D

Behavior of water in soil cultivated with sunflower under water stress

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