Journal
AUSTRALIAN JOURNAL OF SOIL RESEARCH
Volume 39, Issue 6, Pages 1443-1451Publisher
C S I R O PUBLISHING
DOI: 10.1071/SR00065
Keywords
particle size distribution; soil texture class; classification
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The different classification of particle-size fractions used in Australia compared with other countries presents a problem for the immediate adoption of the exotic pedotransfer functions. Australia adopted the international system which defined silt as particles with diameters in the range 2-20 mum, while the USDA/FAO define it as 2-50 mum. We present empirical equations to convert between the two systems. The USDA/FAO textural classes were also plotted in the International system's coordinate. The USDA/FAO classes in the International system had a 'boomerang' shape and only occupy 60% of the triangle. Particle-size data showed that the data are evenly distributed in the USDA/FAO triangle, while most data are concentrated in the boomerang in the International system. We therefore suggest that it would seem wise for most countries to consider adopting the particle-size limits and texture classes of the USDA/FAO system.
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