Search results
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 in marine shale.
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).
Jan 19, 2017 · A few long-destroyed buildings would explain the presence of limestone nodules in the soil while saying nothing about the bedrock. The point is there are many possible sources of limestone that are not the underlying bedrock.
Nodule experiment. In this activity students carry out an investigation to find out how the concentration of nitrate in the soil affects the growth of root nodules on peas.
Examples include andic soil properties, episaturation, and identifiable secondary carbonates. A significant number of the terms included in this glossary are words that can be found in a common dictionary, but that have specific unique meanings in the context of soil survey and soil classification.
Nodules form on the roots of legumes that contain nitrifying bacteria. fertilizer – Any of a large number of natural and synthetic materials, including manure and nitrogen, phosphorus, and potassium compounds, spread on or worked into soil to increase its capacity to support plant growth.
People also ask
What is a nodule in geology?
What is a nodule in soil?
What are nodules in legumes?
Do bacteria in soil cause nodules?
What factors affect the formation of nodules in legumes?
Which type of nodules are recognized as diagnostic features in soil taxonomy?
Jul 10, 2015 · The internal structure of soil nodules is primarily the result of seasonal fluctuations in the redox potential (Eh) and pH. These specific structural features directly reflect different pedogenetic processes, soil-forming histories, weathering processes, and pedo-environmental conditions (1; 9; 11; 26; 39).
