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1. • Rounded mineral concretion

     • 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.
     www.britannica.com/science/nodule-geology

     Nodule | Igneous, Sedimentary & Metamorphic | Britannica

2. www.nrcs.usda.gov › sites › defaultA Glossary of Terms Used in Soil Survey and Soil Classification

   www.nrcs.usda.gov › sites › default

   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.

3. www.soils.org › publications › soils-glossaryGlossary of Soil Science Terms

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   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.

4. library.fiveable.me › key-terms › college-bioNodules - (General Biology I) - Vocab, Definition ... - Fiveable

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   Definition. Nodules are specialized structures formed on the roots of certain plants, particularly legumes, where symbiotic nitrogen-fixing bacteria reside. These bacteria convert atmospheric nitrogen into a form that plants can readily use for growth and development.

5. soilscienceaustralia.org.au › asc › soilglosASC - Glosssary - Australian Society of Soil Science Incorporated

   soilscienceaustralia.org.au › asc › soilglos

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   1 The linear extensibility (LE) of a soil layer is the product of the thickness, in centimetres, multiplied by the COLE of the layer in question. The LE of a soil is the sum of these products for all soil horizons (Soil Survey Staff 1999). Vesicular pores

   • Author: David Jacquier, Csiro Land

   • Publish Year: 2007

6. sis.agr.gc.ca › cansis › taxaChapter 17: Terminology for Describing Soils

   sis.agr.gc.ca › cansis › taxa

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   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

7. www.sciencedirect.com › stem-nodulesStem Nodules - an overview | ScienceDirect Topics

   www.sciencedirect.com › stem-nodules

   Stem Nodules. In subject area: Agricultural and Biological Sciences. The term `stem nodules' would be reserved for nodules `whose location prevents contact with the soil and whose formation is initiated on a primordium and not on an outgrowing adventitious root'. From: Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1998.

8. People also ask

   What is a nodule in soil?

   • Nodule.—A kind of concentration within a soil horizon consisting of a chemical compound, such as calcium carbonate, iron oxide, or hydrated amorphous silica (opal), that is cemented to form a discreet body. It can be removed from the soil intact and has no evident orderly internal organization.

   A Glossary of Terms Used in Soil Survey and Soil Classification

   www.nrcs.usda.gov/sites/default/files/2022-08/A_Glossary_of_Terms_Used_in_Soil_Survey_and_Classification.pdf

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   Which type of nodules are recognized as diagnostic features in soil taxonomy?

   • Durinodes and iron/manganese nodules are specific kinds of nodules recognized as diagnostic features in Soil Taxonomy. Calcium carbonate nodules are considered a kind of identifiable secondary carbonate. Nodules are similar to concretions but concretions have evident internal organization.

   A Glossary of Terms Used in Soil Survey and Soil Classification

   www.nrcs.usda.gov/sites/default/files/2022-08/A_Glossary_of_Terms_Used_in_Soil_Survey_and_Classification.pdf

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   What does a hard nodule mean?

   • In the classification hard is used as a general term to indicate strength. Hard nodules or segregations means their strength is such that they cannot be broken between the thumb and forefinger; ie. strong in the Field Handbook. When referring to pans hard means moderately cemented or stronger (Field Handbook).

   ASC - Glosssary - Australian Society of Soil Science Incorporated

   soilscienceaustralia.org.au/asc/soilglos.htm

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   What is a soil horizon containing nodules?

   • Soil horizons containing nodules (or concretions) are indicated with the suffix “c” (e.g., Bsc, Bgc). See concretion. Normal year.—A term used throughout the Keys to Soil Taxonomy as part of the criteria for determining the class of soil moisture regime from long-term (30 years or more) precipitation data.

   A Glossary of Terms Used in Soil Survey and Soil Classification

   www.nrcs.usda.gov/sites/default/files/2022-08/A_Glossary_of_Terms_Used_in_Soil_Survey_and_Classification.pdf

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   What are non-leguminous root nodules?

   • Non-leguminous root nodules, also known as actinorhizae, are present on hundreds of species of smaller, woody, dicotyledonous trees and shrubs, like Myrica and alder, and also on larger trees, such as Casuarina. They are found in both tropical and temperate climates.

   Stem Nodules - an overview | ScienceDirect Topics

   www.sciencedirect.com/topics/agricultural-and-biological-sciences/stem-nodules

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   How does Azorhizobium caulinodans form stem and root nodules?

   • Azorhizobium caulinodans forms stem nodules by crack entry through dormant root primordia along the stem. This process is different from the legume nodule formation, which is a result of a complex series of signal exchanges and gene activation sequences.

   Stem Nodules - an overview | ScienceDirect Topics

   www.sciencedirect.com/topics/agricultural-and-biological-sciences/stem-nodules

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9. library.fiveable.me › college-bio › root-nodulesRoot nodules - (General Biology I) - Vocab, Definition ...

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   Root nodules are specialized structures found on the roots of certain plants, primarily legumes, that house nitrogen-fixing bacteria. These nodules play a crucial role in enhancing soil fertility by converting atmospheric nitrogen into a form that plants can use for growth, establishing a symbiotic relationship between the plant and the bacteria.