2 edition of Management of gypsiferous soils found in the catalog.
Management of gypsiferous soils
Food and Agriculture Organization of the United Nations. Soil Resources, Management, and Conservation Service.
1990 by Food and Agriculture Organization of the United Nations in Rome .
Written in English
Includes bibliographical references (p. 61-69)
|Statement||Soil Resources, Management and Conservation Service, FAO Land and Water Development Division.|
|Series||FAO soils bulletin -- 62.|
|The Physical Object|
|Pagination||viii, 89 p. :|
|Number of Pages||89|
The optimum moisture content and the maximum dry unit weight are similar to those predicted by laboratory Proctor testing using energy levels comparable to those employed in the field. Soils are complex natural bodies formed under the influence of plants, microorganisms and soil animals, water and air from their parent material, i. The required weight is fastened by the metal wire and raised to the specific height by moving the hold by hand then it is locked with the toothed crow bar. Experimental Work This section includes description of the sampling methods, the testing apparatus used in addition to the procedures of testing.
Gypsum, which is significantly more soluble than calcite, contributes to the electrical conductivity of the soil solution and affects physical and chemical soil properties important to soil uses. Aridisols are the developed soils of dry regions. Morphological aspects of microorganism habitats in a vertisol J. Al-Zory, The effect of leaching on lime stabilized gypseous soil, M. Arutyunyan and A. Ustalfs with high sodium content occur to a limited extent in the Willcox Playa vicinity.
Pedosedimentary fabrics of soils within loess and colluvium in southern England and southern Germany R. Structural degradation of a prairie soil from long-term management R. This operation is repeated to reach the required number of blows. Morphology and characterization by selective dissolution P. Yaghmaeean, N, Givi, G. Alfisols, like the Mollisols, occur at higher elevations than Aridisols and are scattered throughout the semiarid and subhumid regions of Arizona.
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In this test, two identical samples are tested independently. Mechanical Tests Compaction Tests Standard and modified compaction tests are carried out for the untreated soils to determine the moisture-unit weight relationship.
However, there are four problem areas. Continuation of deformation and collapse upon leaching due to water movement. Bioturbation, biofabrics and the biomantle: an example from the Sydney Basin G.
The soil is compacted through the falling weights at different heights and the required number of blows. Gypsum, which is significantly more soluble than calcite, contributes to the electrical conductivity of the soil solution and affects physical and chemical soil properties important to soil uses.
These tests are carried out on untreated and compacted samples to determine the compressibility characteristics. To improve the mineralogical classification, definitions should apply to a uniform soil depth and they should be more simply written.
Totally, 15 types of gypsum soils were prepared. Different soils having different gypsum contents are used to study the effect of dynamic compaction on improving the collapsibility characteristics of these soils.
Are there other concerns instead, i. Furthermore, the information needed to assign a mineralogy class is often not available. Although not officially recognized in Arizona, there may be some soils that belong to a siliceous family.
In addition, clay mineral activity measured by cation exchange capacity will provide further separations at either the family or series level.
Petrukhin, "Collapse and suffusion deformations in gypsy soil," In Proc.
Finally, the properties selected in Soil Taxonomy as criteria for differentiating among suborder, great group, subgroup, and family taxa of tephra-influenced soils have worked very well.
In Iraq, gypseous soils cover wide areas, sometimes with high gypsum content that exceeds the soil content, and today engineering properties of these soils in some areas are unknown.
J Ringrose-Voase. The existence of cracks due to seasonal changes. The Eng-Tips staff will check this out and take appropriate action. Alfisols, like the Mollisols, occur at higher elevations than Aridisols and are scattered throughout the semiarid and subhumid regions of Arizona. Some problems noted in the present mineralogy classification or that complicate mineralogy classification are as follows: Certain fine-silty and fine-loamy particle-size class soils have fine montmorillonitic characteristics.gypsum in gypsiferous sands and the hydration of others, for example, anhydrite.
Yet other minerals break down rapidly in the presence of groundwater, like pyrite; the resulting sulphate ions, when carried in solution, can attack concrete foundations. Soils with low strength are also highly deformable.
Lack of strength leads to. - A simple classification of biological soil crust habitat on the Colorado Plateau - 3 Table 1.
A dichotomous key and descriptions of soil types. 1a. Soils primarily consist of clay- and silt-sized particles. Clay content is almost always greater than 30%. Surfaces generally exhibit a roughened popcorn. Gypsum (CaSO 4 ·2H 2 O) is the only pedogenic calcium sulfate mineral that has been found in soils with ustic, xeric, and aridic moisture regimes.
It has been found in soils in 14 of the 17 conterminous western states by the National Soil Survey Laboratory and likely will be found in the other three.
However, little information is available to assess how these crops will respond when produced with deficit irrigation on the gypsiferous soils of the region. This greenhouse study evaluated various growth components of common bean and green gram irrigated with deficit irrigation in soils with and without gypsum and at three levels of soil salinity.
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