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Main Title Simulation of nitrogen movement, transformation, and uptake in plant root zone /
Author Davidson, James M., ; Graetz, Donald A. ; Rao, P. Suresh C. ; Selim., H. Magdi
Other Authors
Author Title of a Work
Davidson, James M.
CORP Author Florida Univ., Gainesville.;Environmental Research Lab., Athens, Ga.
Publisher Environmental Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency,
Year Published 1978
Report Number EPA-600/3-78-029; EPA-R-803607
Stock Number PB-280 712
OCLC Number 03984697
Subjects Soils--Nitrogen content ; Plant-soil relationships
Additional Subjects Plant physiology ; Plant nutrition ; Nitrogen ; Fertilizers ; Mathematical models ; Partial differential equations ; Nitrification ; Nitrogen inorganic compounds ; Ammonia ; Ion exchanging ; Adsorption ; Plant tissues ; Soil water ; Reaction kinetics ; Fortran ; Computer programs ; Denitrification
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD  EPA 600-3-78-029 c.1 Headquarters Library/Washington,DC 02/03/2014
ELBD ARCHIVE EPA 600-3-78-029 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ELBD  EPA 600-3-78-029 AWBERC Library/Cincinnati,OH 03/29/2021
ESAD  EPA 600-3-78-029 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-280 712 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation x, 106 pages : illustrations, figures, tables ; 28 cm.
A detailed research model and a conceptual management model were developed to describe the fate of nitrogen in the plant root zone. Processes considered in both models were one-dimensional transport of water and water-soluble N-species as a result of irrigation/rainfall events, equilibrium absorption-desorption, microbiological N-transformations, and uptake of water and nitrogen species by a growing crop. The research model was based on finite-difference approximations (explicit-implicit) of the partial differential equations describing one-dimensional water flow and convective-dispersive NH4 and NO3 transport along with simultaneous plant uptake and microbiological N-transformations. Ion-exchange (absorption-desorption) of NH4 was also considered. The micro-biological transformations incorporated into the model describe nitrification, denitrification, mineralization and immobilization.
EPA Grant No. Contract Number: R-803607. Includes bibliographical references (pages 67-76).