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Title: Soil distribution pattern and gypsic soils of Alqatif Oasis, Saudi Arabia
Authors: Youssef, A.F.
Keywords: Agricultural area
Alqatif Oasis
Saudi Arabia
Typic Calciorthids
Issue Date: 1991
Publisher: King Saud University
Citation: Journal of King Saud University, Agricultural Sciences: 3 (1); 127-138
Abstract: Alqatif Oasis, on the Arabian Gulf, is the largest agricultural area in the eastern Saudi Arabia. Field studies indicated that this area was formed on a base of Tertiary Dam and Hardrukh marls, with Iow ridges representing older gulf levels. During the Quaternary period, sand dunes were deposited on the higher flats in the west, and evaporites formed playas or sabkhas on depressions between ridges of the flats. The dominant minerals in soils are calcite, aragonite, gypsum, orthoclase, and quartz. However, dolomite was the dominant carbonatic mineral in the soils on older geological formations. Soils on sand dunes and flats are classified as siliceous, hyperthermic, Typic Torripsamments, and fine carbonatic, hyperthermic, Typic Calciorthids respectively. Due to the presence of a local aquic soil moisture regime. a hyperthermic soil temperature regime, and a gypsic horizon in younger sabkha soils, a new subgroup "Aquic Gypsiorthids" is introduced. It is suggested to add this subgroup to the Gypsiorthids great group of the Soil Taxonomy. Also a new method was introduced for the estimation of soil age.
URI: http://hdl.handle.net/123456789/1860
Appears in Collections:Journal of the King Saud University - Agricultural Sciences

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