The measurement of soil structure - Some practical initiatives

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Abstract
Soil structure has many aspects, and it is difficult to measure and characterize, particularly in soils where structure changes with wetting and drying. There is a need for soundly based methods robust enough to be used routinely on a range of soils. Such methods should also provide parameters for use in soil, hydrological and agronomic process models to enable the effect of soil structure to be simulated. This paper describes five methods and presents some results of indices which are proving useful in soils studies. An index of aggregate breakdown is derived from the proportion of sizes

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