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Research ArticleArticles

Development of the Steel Rod Technique for the Assessment of Aeration in Urban Soils

S. J. Hodge, R. Boswell and K. Knott
Arboriculture & Urban Forestry (AUF) September 1993, 19 (5) 281-288; DOI: https://doi.org/10.48044/jauf.1993.045
S. J. Hodge
Forestry Authority Research Division Alice Holt Lodge, Farnham, Surrey, England, GU10 4LH
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R. Boswell
Forestry Authority Research Division Alice Holt Lodge, Farnham, Surrey, England, GU10 4LH
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K. Knott
Forestry Authority Research Division Alice Holt Lodge, Farnham, Surrey, England, GU10 4LH
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  • Figure 1:
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    Figure 1:

    Presence of matt grey corrosion on steel rods after three months under five soil moisture regimes.

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    Figure 2:

    Presence of smooth black corrosion on steel rods after three months under five soil moisture regimes.

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    Figure 3:

    Presence of shiny metal on steel rods after three months under five soil moisture regimes.

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    Figure 4:

    Presence of red/brown rust on steel rods after three months under five soil moisture regimes.

Tables

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    Table 1:

    The interpretation of steel rod corrosion patterns after Carnell & Anderson (1986).

    Red/brown rust:indicates a well aerated soil.
    Raised black:occurs where rusting has started but has been interrupted, or where rust has been knocked off during removal of the rod from the ground.
    Shiny metal:can indicate the presence of substances (usually polyphenols or oil products) which have protected the rods from rusting. These can arise from organic residues that are under anaerobic conditions, and the soil can be classed as inhospitable for root growth.
    Smooth black:occurs where anaerobic bacteria utilize soil sulphates producing hydrogen sulphide, which reacts with the surface of the metal.
    Matt grey:indicates totally anaerobic conditions.
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    Table 2:

    Dry bulk density (g/cm3) of soils used in the laboratory study of steel rod corrosion patterns.

    loosecompacted
    sandy loam1.441.59
    clay loam1.171.39
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Arboriculture & Urban Forestry (AUF)
Vol. 19, Issue 5
September 1993
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Development of the Steel Rod Technique for the Assessment of Aeration in Urban Soils
S. J. Hodge, R. Boswell, K. Knott
Arboriculture & Urban Forestry (AUF) Sep 1993, 19 (5) 281-288; DOI: 10.48044/jauf.1993.045

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Development of the Steel Rod Technique for the Assessment of Aeration in Urban Soils
S. J. Hodge, R. Boswell, K. Knott
Arboriculture & Urban Forestry (AUF) Sep 1993, 19 (5) 281-288; DOI: 10.48044/jauf.1993.045
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