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Potentially-mineralizable

This has led to research into identification of labile pools of organic matter (which make up a relatively small proportion of the total pool) that are more sensitive to changes in soil management or environmental conditions than total soil organic matter content. Examples of such pools include C and N held in the microbial biomass and in particulate organic matter and in water-soluble, easily-extractable and potentially mineralizable fractions (Haynes 2005). [Pg.202]

Potentially mineralizable C and N are often measured by incubating a sample of field-moist soil at a known temperature in a sealed chamber containing an alkali trap. The C02-C accumulated in the trap is measured by acid titration and this represents the quantity of C mineralized. Alternatively, C02 in the headspace of the incubation chamber can be measured using a C02 analyser. The amount of N mineralized during incubation is calculated as the difference in extractable NH4+ - andNCV-N measured in the soil before and after incubation. Mineralizable N can also be measured in an open incubation system where the soil is leached periodically and NH4+- andNCV-N in leachates is measured (Stanford 1982). [Pg.211]

As with particulate and soluble organic matter, seasonal fluctuations in potentially mineralizable C and N can occur in field soils (Boone 1994 Bonde and Rosswall 1987 Campbell et al.1999 a,b). These are normally related to seasonal inputs of readily mineralizable organic matter through rhizodeposition of root material during crop growth and/or inputs of litter and crop residues. [Pg.211]

Potentially mineralizable C and N About 1-5% of organic C and total N Quantities of organic C and N released by indigenous soil microflora during a laboratory incubation. Values are the result of an integration of physical, chemical and microbiological properties of the soil. Indicator of the N fertility of soils and their ability to supply N to crops. [Pg.222]

Bonde TA, Rosswall T (1987) Seasonal variation of potentially mineralizable nitrogen in four cropping systems. Soil Sci Soc Am J 51 1508-1514... [Pg.224]

Juma et al. [49] give details of studies to determine the most suitable equation, and the most appropriate method for calculating the values of the equation parameters, for estimating net nitrogen mineralization in the soil. Data obtained for several different types of soil are examined. Both the hyperbolic equation and a first-order equation gave accurate predictions of the amount of nitrogen mineralized over an incubation period of 14 weeks, but the estimates of potentially mineralizable nitrogen and its half-life depended on the model used. [Pg.330]

The carbon-to-nitrogen ratio, enzyme activity, and potentially mineralizable nitrogen (PMP) are useful indicators that can be used to determine the soil s capacity to release ammonium N. [Pg.322]

Basal mineralization of organic phosphorus or potentially mineralizable organic phosphorus (PMP)... [Pg.383]

To determine the PMP, field moist soils are incubated under anaerobic conditions at 30°C for a period of 15 days. This method is similar to the one described for potentially mineralizable nitrogen... [Pg.384]

FIGURE 17.28 Relationship between potentially mineralizable nitrogen (PMN) and microbial biomass nitrogen of soil in four hydrologic units of the Everglades. (Wright, A., and Reddy, K. R., Unpublished Results, University of Florida.)... [Pg.654]

FIGURE 17.33 Relationship between mass C Pq ratio and potentially mineralizable organic phosphorus in soils along phosphorus gradient in the WCA-2A. (From Chua, 2000.)... [Pg.658]

Potentially Mineralizable Phosphorus Rates in the Floe and Surface Soils from Select Hydrologic Units of the Everglades... [Pg.659]


See other pages where Potentially-mineralizable is mentioned: [Pg.201]    [Pg.210]    [Pg.211]    [Pg.211]    [Pg.211]    [Pg.214]    [Pg.218]    [Pg.283]    [Pg.286]    [Pg.279]    [Pg.384]    [Pg.581]    [Pg.591]    [Pg.595]    [Pg.595]    [Pg.653]    [Pg.658]    [Pg.659]    [Pg.331]   
See also in sourсe #XX -- [ Pg.203 ]




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