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Use of Effective Stress to Predict the Penetrometer Resistance of Unsaturated Agricultural Soils by W.R. Whalley; P.B. Leeds-Harrison; L.J. Clark; D.J.G. Gowing is a Agricultural and Biological Sciences article available to read on EtoBox.

What is Use of Effective Stress to Predict the Penetrometer Resistance of Unsaturated Agricultural Soils about?

One of the most important functions of soil is to provide an environment for root growth. Ideally, roots will elongate with minimal impedance and acquire water and nutrients so that crops may grow to their full potential. In practice, physical stresses in the root environment restrict root growth: one of the most commonly-cited physical stresses that affect root growth is ''mechanical impedance''. When soils are strong, because they are compact or dry, roots elongate more slowly and this in turn has a detrimental effect on plant growth. In this paper, we examine the relative importance of compaction and soil drying as factors that lead to strong soil. We measured soil strength with both a tensile test and a penetrometer. We compared pressures of rotating and fixed (non-rotating) penetrometers. The utility of the rotating penetrometer is that it is thought to give a resistance to penetration similar to that experienced by elongating plant roots. For three soils, we confirmed published work reporting that effective stress can be used to define a relationship between tensile strength and soil water status that is common for a range of soils. Then, for loamy sand and silty clay loam so

Who reads Use of Effective Stress to Predict the Penetrometer Resistance of Unsaturated Agricultural Soils?

Author

W.R. Whalley; P.B. Leeds-Harrison; L.J. Clark; D.J.G. Gowing

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0167-1987)

Published

2005

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)