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This paper deals with the sensitivity of classification, i.e. the extent to which the modification of soil properties influences the degree of membership in a fuzzy or continuous soil classification system. The sensitivity around the centroids of four Australian Great Soil Groups (GSG), black earth, red-brown earth, krasnozem and euchrozem was determined for the 21 attributes that define the classes...
We report an image analysis study of soil macropore attributes in the top 100 mm of a winter barley (Hordeum vulgaris L.) seedbed in Scotland that had been prepared by chisel-ploughing and secondary tillage of a clay loam soil using either zero, reduced ground pressure, or conventional wheel-traffic systems. Five intact blocks of soil were collected from one plot of each traffic system. After impregnation...
The predominant methods of measuring soil structural stability are confined to laboratory methods that, by their nature, do not quantify the field stability of the soil. An instrument is presented here for measuring the soil structural stability in situ. Stability is assessed by a method based on the change in structural characteristics that may occur when the soil is permeated by non-interactive...
The micromorphology and elemental composition of celestobarite crystals in a duripan from central Australia are examined. These crystals are flabellate (fan-shaped), have a Ba/Sr ratio of 11.1, and are up to 50 μm in size. The location of the celestobarite crystals within silicified roots and in close association with calcite and clay coatings indicates that these celestobarite crystals are authigenic...
Currently there is a lack of quantitative data on the functional classification of soil structure, particularly in routine soil surveys, because field physical measurements of flow characteristics are slow and require expertise. A simple air permeameter was developed which allows rapid, in situ measurements to be made of the intrinsic permeability of the soil to air (k a ). Measurements...
Adjacent cultivated and never-cultivated areas of land were compared for a variety of chemical and physical properties to determine the effect of traditional cultivation practices on an Australian Rhodoxeralf. Those properties which changed most as a result of clearing and cultivation were pH, electrical conductivity, organic carbon, nitrogen and profile macroporosity. These changes are due to various...
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