Report on the lands of the Ord River catchment, Northern Territory
by J. M. Aldrick, D. F. Howe and C. R. Dunlop.
Aldrick, J. M.; Howe, D. F. (David F.); Dunlop, C. R. (Clyde Robert)
E-Publications; E-Books; PublicationNT; 78/24
Made available via the Publications (Legal Deposit) Act 2004 (NT).
Date:1978; Bibliographhy: p. 103.
Land use -- Northern Territory -- Ord River Region
Animal Industry & Agriculture Branch, Dept. of the Northern Territory
109 p., p. of plates : ill., maps ; 29 cm.
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The clay plains on the Sturt Plateau (land systems Kirkimbie 1 and 2) are made up of soils which are essentially similar to those of the clay plains in the volcanic regions. Here, a similar catena can be observed, and the few slightly higher areas have browner clays and the lower lying areas contain grey clays. Kirkimbie 1 is the more extensive land system with the lowest gradients, while Kirkimbie 2 has rejuvenated, incising, drainage. Profiles in Kirkimbie 2 show some evidence of truncation. Secondary carbonate concretions can be observed scattered on the soil surface and this is most pronounced nearest to the edge of the plain where surface run-off would be expected to be greatest. It seems likely that the secondary carbonate is pedogenic in origin, and the product of long periods of leaching through the soils. B. Summary of soil classification The classification into uniform, gradational and texture-contrast soils follows the criteria of Northcote (1971). The term "skeletal" is used to describe profiles shallower than 30 cm where only minimal profile development was observed. The term "stratified", used to describe the recent alluvial soils is self-explanatory. Factual keys are presented within the limits of variability of the soil groups used in the classification. A summary of the soil classification is given in Table 2. - 24