Soil bulk density corrections for providing a better relationship with root growth in gravelly soil

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Abstract
Bulk density of a Tifton (Plinthitic Paleudult; fine loamy, siliceous, thermic) soil containing 5.8-11.0% of the sample weight as pebbles was 0.06-0.12 g/cm3 lower when corrections were made for presence of pebbles or concretions. A method for determining the bulk density of the soil matrix between pebbles or concretions is outlined. After adjustment, the bulk density at which root [Cucumis sativus] penetration was inhibited in this soil closely approximated that for soils which do not contain concretions. The proposed procedure reflects more nearly how bulk density changes where plant roots are growing than previously published procedures do.

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