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United States Department of Agriculture

Agricultural Research Service

Title: Extraction of the Soil Fraction Corresponding to Pool II of the Model Ncsoil

Authors
item Chiu, C - UNIVERSITY OF MINNESOTA
item Xu, J - UNIVERSITY OF MINNESOTA
item Cheng, H - UNIVERSITY OF MINNESOTA
item Koskinen, William
item Molina, J - UNIVERSITY OF MINNESOTA

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: November 1, 1995
Publication Date: N/A

Technical Abstract: The rate of ammonium released from soil submitted to weak acid hydrolysis (1M-HC1) decreased suddenly after 2 to 4 hours. The level of ammonium in the hydrolyzate was recorded after 4 hours, and correlated to the active pool of the model NCSOIL. The model's active pool (Pool I plus Pool II) was computed by calibration of NCSOIL against the cumulative release of CO2 and inorganic nitrogen obtained by the soil incubation technique of Stanford and Smith. Pool I which represents the soil biomass, was determined by the fumigation extraction procedure. The data were obtained from soils sampled at the Cedar Creek Natural History Area which documents the increase of soil organic matter during prairie regeneration after intensive cultivation.

Last Modified: 7/25/2014
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