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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.”.
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. Advertising. Feedback. Donate.
Nodules facilitate a mutualistic relationship where plants provide carbohydrates to bacteria in exchange for fixed nitrogen. These structures are critical for soil fertility as they enrich the soil with bioavailable nitrogen. Nodule formation is induced by signaling molecules called Nod factors produced by the symbiotic bacteria.
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.
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.
Nodules are produced on taproots as well as lateral roots of legumes and may vary in size from 1 millimeter to 2 to 3 centimeters (Fig. 12-44A). Nodules may be round or cylindrical and as large or larger than the root diameter on which they form. Their number and size vary with the plant, bacterial strain, age of infection, and so on.
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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.
