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For soil science students and soil survey practitioners who want more than a simple definition, this glossary offers additional information for a deeper understanding. A wide array of terms are included.
TERM OF THE WEEK. colony forming units (cfu): Number of microorganisms that can form colonies when cultured on artifical media using spread plates or pour plates: an indication of the number of viable, culturable microorganisms in a soil or rhizophere sample.
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.
Some other features of soils and sites that may be described are humus form, permafrost, land use, concretions, nodules, calcareousness, salinity, coarse fragments, and reaction. Example of a Pedon Description
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.
- The Editors of Encyclopaedia Britannica
Nodulation is a symbiotic process leading to the formation of nodules when Leguminosae roots are infected by rhizobia bacteria from soil. The bacteria in nodules convert atmospheric nitrogen to ammonium or nitrogen dioxide, which can be utilized for plant growth and development (Mylona et al., 1995).
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What is a nodule in soil?
What is a nodule in geology?
Why are nodulins called nodules?
Which type of nodules are recognized as diagnostic features in soil taxonomy?
What does a nodule do?
A common application of soil classification (the act of identifying the taxonomic classification for a given soil) is to develop models of how soils of different classifications associate with one another within a landscape, which can eventually be used in soil mapping.
