Physical assessment of a soil with respect to rooting potential

Groenevelt, P. H.; Kay, B. D.; Grant, C. D.

doi:10.1016/0016-7061(84)90016-8

Cited by 165 publications

(133 citation statements)

References 20 publications

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“…Assim, os logaritmos de K a foram utilizados para tornar as distribuições mais próximas da normalidade (Groenevelt et al, 1984;Ball et al, 1988;Blackwell et al, 1990). Apenas os potenciais mátricos a partir de -5,0 kPa foram utilizados na avaliação da permeabilidade ao ar e na estimativa dos índices de continuidade de poros, pois em condições de ψ m maiores (-0,5; -1,0; -2,0 e -3,0 kPa) o solo apresentou-se impermeável ou, em raras medições, com baixos valores de K a .…”

Section: Resultsunclassified

“…Para determinar se as diferenças de K a podem ser atribuídas somente àquelas de ε a ou se elas deveriam ser atribuídas a outros aspectos geométricos do espaço poroso preenchido com ar, tais como a tortuosidade e continuidade, foi utilizado o índice de continuidade de poros K 1 , que corresponde ao cálculo da razão K a /ε a (Groenevelt et al, 1984). Assim como K a , o índice de continuidade de poros K 1 apresentou distribuição lognormal, de forma que todas as análises posteriores foram executadas utilizando a transformação logarítmica para cada amostra individualmente.…”

Section: Resultsunclassified

“…O índice de continuidade de poros K 1 , proposto por Groenevelt et al (1984), foi calculado com base na relação entre K a e ε a :…”

Section: Methodsunclassified

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Qualidade física de um latossolo vermelho sob plantio direto submetido à descompactação mecânica e biológica

Silveira

Silva

Figueiredo

et al. 2012

Rev. Bras. Ciênc. Solo

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Section: Resultsunclassified

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Qualidade física de um latossolo vermelho sob plantio direto submetido à descompactação mecânica e biológica

Silveira

Silva

Figueiredo

et al. 2012

Rev. Bras. Ciênc. Solo

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“…N is considered an index of pore continuity that reflects the increase in K a with the increasing of Ɛ a or the decreasing of pore tortuosity and surface area with an increase in the fraction of pores available for flow (Groenevelt et al, 1984). The relationship between K a and Ɛ a was fitted to a logarithmic form for equation 3, which was conducted using equation 4:…”

Section: Methodsmentioning

confidence: 99%

“…Ball (1981), Ball et al (1988) and McCarthy & Brown (1992) describe a direct relationship between K a and air-filled porosity (Ɛ a ). Ball et al (1988), Blackwell et al (1990), Dörner & Horn (2006) and Groenevelt et al (1984) used the relationships between K a and Ɛ a to estimate indexes of pore continuity that characterize functional changes in the soil pore system. In Brazil, Silva et al (2009) (Ball & Robertson, 1994;Rodrigues et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Aeration condition of a clayey oxisol under long-term no-tillage

Betioli

Tormena²,

Moreira

et al. 2014

Rev. Bras. Ciênc. Solo

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The hypothesis of this study was that the absence of soil tillage in long-term no-tillage (NT) systems can be detrimental to soil aeration. The objective was to assess the aeration condition of an Oxisol (Rhodic Ferrasol), very clayey texture (750 g kg-1 of clay; 200 g kg-1 of sand), after 30 years of cultivation under NT. The physical property soil air permeability (Ka) is sensitive to changes in the soil pore system. Aside from Ka, the air-filled porosity (ε a) and indices of pore continuity (K1 and N), derived from the relationship between Ka and εa, were used as indices of soil aeration. From the soil layers 0.0-0.1 and 0.1-0.2 m, 240 undisturbed samples were collected along a transect perpendicular to the crop rows, at three sampling positions: corn plant row (CR); center of the interrow (INT); and the equidistant point between CR and INT (PE). The properties Ka and εa were determined at soil matric potentials (Ψm) of -2, -4, -6, -10, -30, and -50 kPa. Soil bulk density (BD) was also determined. The results confirmed the hypothesis. In the 0.0-0.1 m layer, Ka, K1, N and Ψa were significantly greater and BD significantly lower in CR than at the other sampling positions. At a Ψm of -10 kPa, the Ka of CR was 6.9 and 8.4 times higher than in PE and INT, respectively, in the 0.0-0.1 m layer. The properties Ka, K1 and N were sensitive enough to detect changes in the pore system and their differences between the sampling positions demonstrated the importance of the spatial location for soil sampling. Tilling the crop rows provides better soil aeration under NT.

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Anisotropy of pore functions in structured Stagnic Luvisols in the Weichselian moraine region in N Germany

Dörner

Horn

2006

Z. Pflanzenernähr. Bodenk.

105

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In order to determine if soil hydraulic properties present a direction-dependent behavior, undisturbed samples were collected at different horizons and orientations (vertical, diagonal [45°], and horizontal) in structured soils in the Weichselian moraine region in northern Germany. The water-retention curve (WRC), the saturated hydraulic conductivity (k f ), and the air permeability (k a ) were measured. The air-filled porosity (e a ) was determined, and pore-continuity indices (k a /e a , k a / e a 2 , N) and blocked porosities (e b ) were derived from the relationship between k a and e a . The development of soil structures with defined forms and dimensions (e.g., platy by soil compaction or prismatic up to subangular-blocky by swelling-shrinkage processes) and the presence of biopores can induce a direction-dependent behavior of pore functions. Although the pore volume as a scalar is isotropic, the saturated hydraulic conductivity and air permeability (as a function of air-filled porosity) can be anisotropic. This behavior was observed in pore-continuity indices showing that the identification of soil structure can be used as a first parameter to estimate if hydraulic properties present a direction-dependent behavior at the scale of the soil horizon.

show abstract

Physical assessment of a soil with respect to rooting potential

Cited by 165 publications

References 20 publications

Qualidade física de um latossolo vermelho sob plantio direto submetido à descompactação mecânica e biológica

Qualidade física de um latossolo vermelho sob plantio direto submetido à descompactação mecânica e biológica

Aeration condition of a clayey oxisol under long-term no-tillage

Anisotropy of pore functions in structured Stagnic Luvisols in the Weichselian moraine region in N Germany

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