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Soil and land potential

is a subject often ignored in the study of soil physics, runoff from soils and soil solute movement. The issue is squarely faced in an important paper by Philip (1980) on ’Field heterogeneity: some basic issues’. A number of points are raised which run through so much of what soil physics and soil solute studies try to achieve. Firstly, it is stated that laboratory and simple field measurements can be carried out from which quantitative predictions can be made. Secondly, difficulties arise in applying the results of such work in a wider field context. Field hetero-