1. General Model Information

Name: PTARG, RC and RECPF - Simple P balance model.

Acronym: PTARG

Main medium: terrestrial
Main subject: biogeochemistry, agriculture, soil science
Organization level: ecosystem, population
Type of model: compartment model
Main application:
Keywords: phosphorus dynamics, soil

Contact:

Ir. J. Wolf.
Wageningen Agricultural University, Dept. Theoretical Production Ecology, P.O.Box 430, 6700 AK Wageningen, THE NETHERLANDS.
Phone: +31.317.484769
Fax: +31.317.484892
email: tpewolf@rcl.wau.nl

Author(s):

Abstract:

A simple phosphorus balance model to calculate long-term changes in available soil phosphorus, phosphorus uptake by the crop and recovery of applied phosphorus. It functions with time intervals of one year or one growing season. A special version (PTARG) can be applied to establish fertilizer recommendations for a certain target phosphorus uptake by the crop.

Purpose of the model:

Model parentage: -

Source of the AbstractCAMASE Register of Agro-ecosystems Models

II. Technical Information

II.1 Executables:

Operating System(s): PC.
Contract necessary:
Costs: : None.
Comments:

II.2 Source-code:

Programming Language(s): Microsoft FORTRAN.

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

Rate variables: Base P uptake rate, total P uptake rate, change in labile P and stable organic P.

State variables: See output data (except for fertilizer-P required).

III.2.1 Input

Time constants of dissolution/precipitation, P mineralization, fertilizer-P applied, P partitioning factors. Input check in model: No.

III.2.2 Output

Labile P pool, stable P pool, base P uptake, total P uptake, fertilizer-P required, recovery of fertilizer-P.
Basic spatial unit: Ha.
Input data: Time constants of dissolution/precipitation, P mineralization, fertilizer-P applied, P partitioning factors. Time interval of simulation: 1 Year or 1 growing season.

IV. References

Wolf, J., C.T. de Wit, B.H. Janssen & D.J. Lathwell, 1987. Modeling long-term crop response to fertilizer phosphorus. I. The model. II Comparison with field results. Agronomy Journal 79: 445-451 and 452-458

V. Further information in the World-Wide-Web

VI. Additional remarks

Parentage: -

Last review of this document by: T. Gabele : Dec 10 1997
Status of the document:
last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007