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Lecture notes on the major soils of the world












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    Book (stand-alone)
    World reference base for soil resources 2006 2006
    This publication is a revised and updated version of World Soil Resources Reports No. 84, a technical manual for soil scientists and correlators, designed to facilitate the exchange of information and experience related to soil resources, their use and management. The document provides a framework for international soil classification and an agreed common scientific language to enhance communication across disciplines using soil information. It contains definitions and diagnostic criteria to rec ognize soil horizons, properties and materials and gives rules and guidelines for classifying and subdividing soil reference groups.
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    Book (series)
    World reference base for soil resources 2014
    International soil classification system for naming soils and creating legends for soil maps - Update 2015
    2015
    This publication is a revised and updated version of World Soil Resources Reports No. 84 and 103 and presents the international soil classification system. Every soil in the world can be allocated to one of the 32 Reference Soil Groups as defined in this document, and can further be characterized by a set of qualifiers. The resulting soil name provides information on soil genesis, soil ecological function and soil properties relevant for land use and management. The same system, refined slightly , may be used to name the units of soil map legends, thereby providing comprehensive spatial information. By accommodating national soil classification systems, the World Reference Base facilitates the worldwide correlation of soil information.
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    Book (stand-alone)
    Organic materials and soil productivity
    FAO Soils Bulletin 35
    1977
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    In the temperate zones of the world a favourable balance exists between input and decomposition of organic materials in the soil. This balance is influenced by climatic conditions and the inorganic constituents of the soil, in which the amount and type of clay minerals play an important role. the plant growth caused by the use of mineral fertilizer increases not only the economically important parts of the plants, but also the growth roots and crop residues. Furthermore, in many farms animal exc reta is used to maintain the level of soil organic matter in arable land.There are some interactions between certain clay minerals and fractions of soil organic matter which act as favourable factors for soil productivity and for plant production.

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