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Map unit (soil).—A collection of areas with soil components or miscellaneous areas that are both defined and named the same. Each map unit differs in some respect from all others in a survey area and is uniquely identified by a symbol on a soil map. Each individual area (polygon) on the map is a “delineation.”.
This chapter provides a brief summary of the main terminology used to describe soils at the scales of the landscape and pedon. It refers to the section of the Canadian Soil Information System (CanSIS) Manual for Describing Soils in the Field 1982 Revised in which the terminology and methods of coding descriptive data are defined in detail.
Concretion. A concretion is a hard, compact mass formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. [1] Concretions are often ovoid or spherical in shape, although irregular shapes also occur.
Nodule (geology) In geology and particularly in sedimentology, a nodule is a small, irregularly rounded knot, mass, or lump of a mineral or mineral aggregate that typically has a contrasting composition from the enclosing sediment or sedimentary rock. Examples include pyrite nodules in coal, a chert nodule in limestone, or a phosphorite nodule ...
nodule, rounded mineral concretion that is distinct from, and may be separated from, the formation in which it occurs. Nodules commonly are elongate with a knobby irregular surface; they usually are oriented parallel to the bedding. Chert and flint often occur as dense and structureless nodules of nearly pure silica in limestone or chalk, where ...
- The Editors of Encyclopaedia Britannica
Calcareous soils have often more than 15% CaCO3 in the soil that may occur in various forms (powdery, nodules, crusts etc…). Soils with high CaCO 3 belong to the Calcisols and related calcic subgroups of other soils. They are relatively widespread in the drier areas of the earth. The potential productivity of calcareous soils is high where ...
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10.2 An overview of nodule formation. Nodulation is a host-specific process with each rhizobium having a defined host-plant range (Table 10-1). Rhizobia, normally found in the soil, respond to the plant-root environment (rhizosphere) by increasing their population levels and attaching to the root surface.
