by International Institute for Land Reclamation and Improvement in Wageningen .
Written in English
|Statement||J.G.van Alphen & F.de los Rios Romero.|
|Contributions||Ríos Romero, Francisco de los., International Institute for Land Reclamation and Improvement.|
Introduction. Gypsiferous soils are soils that contain sufficient quantities of gypsum (calcium sulphate) to interfere with plant growth. Soils with gypsum of pedogenic origin are found in regions with ustic, xeric and aridic moisture regimes (Nettleton et al. ). They are well represented in dry areas where sources for the calcium sulphate exist. Food and Agriculture Organization of the United Nations. Soil Resources, Management, and Conservation Service. Management of gypsiferous soils. Rome: Food and Agriculture Organization of the United Nations, (OCoLC) Material Type: Government publication, International government publication: Document Type: Book: All Authors. The existence of gypsum terrains under construction zones is dangerous due to the collapsible nature of gypsum with the presence of water. Remarkable evidences are available on failures in dams, highways and some other structures constructed above gypsiferous soils or by: 5. 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.
The formation, classification and distribution of gypsiferous soils are reviewed. Their physical and chemical properties and their fertility are discussed. The effects of gypsum and calcium carbonate on plants and the improvement of productivity of gypsiferous soils are described. Laboratory methods appropriate to the analysis of gypsiferous soils are given. 1. GYPSIFEROUS SOILS IN THE WORLD. Introduction Origin of Gypsum in Soils Forms of Gypsum in Soils Classification of Gypsiferous Soils. The American classification The FAO-Unesco legend The French classification The Russian classification International Reference Base for soil classification. Equations are given for expressing properties of gypsiferous soils on an oven‐dry + crystal water of gypsum weight basis. Citing Literature Number of times cited according to CrossRef: 9. Introduction. Rozanov () and Kurmangaliyev (b), who studied the gypsiferous soils of the Soviet Union, state that the physical and physico-chemical properties of gypsiferous soils are closely related to those of non-gypsiferous soils when the soils are developed under similar soil forming factors, and the gypsic layer is deep in the profile.
The water requirement for reclamation of gypsiferous sodic soils is about the same as that to reclaim saline, clay loam soils using continuous ponding, or about cm of water per cm of soil. Gypsiferous soils are soils that contain sufficient quantities of gypsum (calcium sulphate) to interfere with plant growth (Nettleton et al. ).They occupy about 90 million ha across Algeria, Argentina, Australia, Iraq, Libya, Somalia, Spain, Sudan, Syria, the former USSR and other arid and semi-arid countries with annual rainfall of less than mm (FAO ). The aim of the present study was to find methodological tools to obtain reasonable results for exchangable Ca2+ of gypsiferous bentonites. Cation exchange capacity (CEC) is an important property of clays. Numerous methods for calculating CEC and exchangeable cations exist; determination of exchangeable Ca2+ fails, however, when gypsiferous clays are examined because gypsum is . Scattered gypsum crystals and crystal intergrowths are common in gypsiferous soils, sometimes with thin bands (dust lines) outlining earlier growth stages. Dissolution features, which are often observed for irrigated soils, include corrosion of the crystal faces, dissolution along cleavage planes and rounding. The book is written by an.