U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 close



Research
                Research Home
                            National Programs
                            Research Projects
                            Scientific Manuscripts
                            International Engagement
                            Scientific Software/Models
                            Databases and Datasets
                            Office of Scientific Quality Review
            Media
                News & Features
                            Multimedia
                            Briefing Room
                            Down on the Farm
                            Press Room
                            Science in Your Shopping Cart
                            Scientific Discoveries
                            Tellus
                            Under the Microscope
            About ARS
                About ARS Home
                            Staff Directory
                            Labs and Research Centers (Map)
                            Headquarter Offices
                            Organizational Chart
                            Employee Services (REE Employees Only)
                            Office of Outreach, Diversity, and Equal Opportunity
            Work With Us
                Work With Us Home
                            ARS Vacancies at USAJOBS
                            Careers at ARS Information
                            Scientific Collaborations
                            Extramural Agreements
                            1890 Faculty Research Sabbatical ProgramSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            Ma, Liwangitem
                                            Ahuja, Lajpatitem
                                            Malone, Robert

                                                         - *Rob*item
                                            Green, Timothy
  Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 8/5/2009
                                    Publication  Date: 11/4/2009
                                    Citation: Ma, L., Ahuja, L.R., Malone, R.W., Green, T.R. A Step by Step Procedure for Parameterization, Calibration, Validation, and Application of a System Model in Field Research. ASA-CSSA-SSSA Annual Meeting Abstracts.Interpretive Summary: Agricultural system models can greatly enhance and extend field research. However, they require a number of parameters for soil, crop, and weather variables. Most often, these parameters are difficult to measure and have to be estimated from some related available data or calibrated to match some measured outcomes. At present, there are no standard calibration procedures available for agriculture system models. In order to facilitate the use of models by field researchers, there is a need to develop such procedures and methodologies. Toward this goal, we present a step by step procedure for parameterization, calibration, validation, and further application of the ARS Root Zone Water Quality Model (RZWQM2) with examples for some typical experimental conditions. Theoretic description of the model is given where appropriate for the users. The procedures and methodology given here should be applicable to other similar models.
                                Technical Abstract: Process-based system models can greatly enhance and extend field research. However, a model of the complex agricultural system requires a number of parameters for soil, crop, and weather variables. Most often, several of these parameters are difficult to measure and have to be estimated from some related available data or calibrated to match some measured outcomes. There can be a great deal of caution required in estimating and calibrating the parameters, as well as in validation and use of the model to extend research. At present, there are no standard calibration procedures available for agriculture system models. In order to facilitate the use of models by field researchers, there is a need to develop such procedures and methodologies. Toward this goal, we present a step by step procedure for parameterization, calibration, validation, and further application of the ARS Root Zone Water Quality Model (RZWQM2) with examples for some typical experimental conditions. Theoretic description of the model is given where appropriate for the users. The procedures and methodology given here should be applicable to other similar models.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov