On the moisture relationships in an ideal soil

Keen, B. A.

doi:10.1017/s0021859600003373

Cited by 25 publications

(11 citation statements)

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“…Various disciplines related to agronomy have proposed to characterize an 'ideal' soil either (i) according to individual parameters such as base-cation saturation ratio (Kopittke and Menzies 2007), moisture (Keen 1924), and capillary pull (Hackett and Strettan 1928), or (ii) through integrated parameters (De Orellana and Pilatti 1999;Janssen and de Willigen 2006;Pilatti and de Orellana 2000).…”

Section: Issues For Agronomistsmentioning

confidence: 99%

Redox potential (Eh) and pH as drivers of soil/plant/microorganism systems: a transdisciplinary overview pointing to integrative opportunities for agronomy

2012

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Background Oxidation-reduction and acid-base reactions are essential for the maintenance of all living organisms. However, redox potential (Eh) has received little attention in agronomy, unlike pH, which is regarded as a master variable. Agronomists are probably depriving themselves of a key factor in crop and soil science which could be a useful integrative tool. Scope This paper reviews the existing literature on Eh in various disciplines connected to agronomy, whether associated or not with pH, and then integrates this knowledge within a composite framework. Conclusions This transdisciplinary review offers evidence that Eh and pH are respectively and jointly major drivers of soil/plant/microorganism systems. Information on the roles of Eh and pH in plant and microorganism physiology and in soil genesis converges to form an operational framework for further studies of soil/plant/microorganism functioning. This framework is based on the hypothesis that plants physiologically function within a specific internal Eh-pH range and that, along with microorganisms, they alter Eh and pH in the rhizosphere to ensure homeostasis at the cell level. This new perspective could help in bridging several disciplines related to agronomy, and across micro and macro-scales. It should help to improve cropping systems design and management, in conventional, organic, and conservation agriculture.

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Section: Issues For Agronomistsmentioning

confidence: 99%

Redox potential (Eh) and pH as drivers of soil/plant/microorganism systems: a transdisciplinary overview pointing to integrative opportunities for agronomy

2012

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“…The low maximum moisture content of 5.3979 percent results from the fact that, at still higher moisture contents, neighboring water rings coalesce, and Eqs. (1) to (8) no longer hold (Haines 1927;Keen 1924). The angle y at which this process starts amounts to 30, 16.…”

Section: Relationship Between Suction and Pendular Water Volumementioning

confidence: 99%

Simulation of Partial Anaerobiosis in a Model Soil in Respect to Denitrification

Leffelaar¹

1979

Soil Science

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Factors affecting anaerobiosis in soil have been studied by means of computer simulation applied to a model soil composed of spherical aggregates in a hexagonal packing. This schematized geometry implies that two different types of pores are distinguished: intra-and interaggregate pores. The moisture characteristics for the interaggregate water and the non-water-covered area of the aggregates, the so-called air-exposed area, were calculated in general terms. The results give a tool to derive curves for a certain aggregate radius. The interaggregate water content is used to calculate the diffusion properties of the model soil down the profile. The diffusion from interaggregate pores into the aggregates is taken proportional to the air-exposed area of the aggregates.

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“…The cohesion of granular materials has intrigued scientists for a long time (Keen, 1924; Haines, 1925; Fisher, 1926). It is a problem many of us will have encountered practically in the construction of sandcastles at a beach.…”

Section: Resultsmentioning

confidence: 99%

Particle Size Segregation during Hand Packing of Coarse Granular Materials and Impacts on Local Pore‐Scale Structure

Lebron

Robinson

2003

Vadose Zone Journal

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Soils and sediments consist of granular particles with an intricate network of pores between them. The structure and orientation of these pores will determine how the material transports fluids and contaminants. A common practice in soil science to simplify experiments and to achieve a homogeneous medium, against which to test transport equations, is to repack a quasi two‐dimensional (2‐D) Hele Shaw cell or a column. Soil is broken up and sieved to remove large particles that could cause anomalous measurements; then it is repacked into the column. However, this procedure destroys the natural structure and imparts a new structural arrangement. The material may appear to have similar bulk properties such as porosity and bulk density, but as we aim to demonstrate, the structural properties will be a function of the method used to repack, and it is unlikely that one can achieve a uniform distribution at the micro‐scale. We present results of experiments using granular materials, demonstrating how mixtures of particles of different sizes segregate when poured, forming banded structures. The rate at which a material is poured will determine the uniformity of the packed sample.

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On the moisture relationships in an ideal soil

Cited by 25 publications

References 1 publication

Redox potential (Eh) and pH as drivers of soil/plant/microorganism systems: a transdisciplinary overview pointing to integrative opportunities for agronomy

Redox potential (Eh) and pH as drivers of soil/plant/microorganism systems: a transdisciplinary overview pointing to integrative opportunities for agronomy

Simulation of Partial Anaerobiosis in a Model Soil in Respect to Denitrification

Particle Size Segregation during Hand Packing of Coarse Granular Materials and Impacts on Local Pore‐Scale Structure

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