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Greyzem (from Anglo-Saxon, grey, and Russian, zemlja, earth) is a soil classification used in the FAO soil classification system which was introduced with the UNESCO Soil Map of the World in 1978. The name is connotative of uncoated silt and quartz grains which are present in layers rich in organic matter.
The Global Soil Partnership, [2] GSP, was initiated by the Food and Agriculture Organization (FAO) and its members with the hope to improve governance of the limited soil resources of the planet in order to guarantee healthy and productive soils for a food-secure world, as well as support other essential ecosystem services.
The 106 Soil Units form 26 Soil Groups. The FAO soil map was a very simple classification system with units very broad, but was the first truly international system, and most soils could be accommodated on the basis of their field descriptions. The FAO soil map was intended for mapping soils at a continental scale but not at local scale.
World Soil Resources Reports 106, FAO, Rome 2015. ISBN 978-92-5-108369-7 (PDF 2,3 MB). IUSS Working Group WRB: World Reference Base for Soil Resources 2006. World Soil Resources Reports 103. FAO, Rome 2006. ISBN 92-5-105511-4. FAO: World Reference Base for Soil Resources, by ISSS–ISRIC–FAO. World Soil Resources Reports 84. FAO, Rome 1998.
The WSM (originally known as International Soil Museum) was created in 1996 at the request of UNESCO and the International Society of Soil Science, [1] with a view to underpin the development of the FAO-UNESCO 'Soil Map of the World' FAO soil classification. The initial ISM building was located at the University of Utrecht.
A soil family category is a group of soils within a subgroup and describes the physical and chemical properties which affect the response of soil to agricultural management and engineering applications. The principal characteristics used to differentiate soil families include texture, mineralogy, pH, permeability, structure, consistency, the ...
Andosols cover an estimated 1–2% of Earth's ice-free land surface. Andosols are a Reference Soil Group of the World Reference Base for Soil Resources (WRB). [ 2 ] They are closely related to other types of soils such as Vitrosols, Vitrandosols, Vitrons and Pumice Soils that are used in different soil classification systems.
An Alisol is a Reference Soil Group of the World Reference Base for Soil Resources (WRB). [1] Alisols have an argic horizon, which has a high cation exchange capacity. In the subsoil, the base saturation is low. There exist mixed forms, for example 'Stagnic Alisol', that are mainly Alisol, but also contain components that are found in Stagnosols.