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Title:   Author  item
                                            Walthall, Charlesitem
                                            KAUL, MONISHA - STARTS 4/8/01item
                                            Timlin, Dennisitem
                                            Daughtry, Craigitem
                                            Pachepsky, Yakovitem
                                            Dulaney, Wayne
  Submitted to: Intnl Conference On Geospatial Information In Agriculture And Forestry
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 8/27/2001
                                    Publication  Date: 11/4/2001
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: Within-field management zones are fundamental spatial units for precision farming. A management zone is based on the response of the crop to conditions within its boundaries and is managed as a unit. Response zones are needed for delineation of management zones by identifying locations where crops respond similarly to soil conditions, water availability, and  management actions. One method of investigating crop response is to link yield or within-season foliage density with these factors using models. The ability of soil to hold water is the most important element in determining crop response for non-irrigated fields and therefore may be a major factor when determining response zones. Simple linear regression, a crop growth simulation model, and a neural network are used to investigate relationships between foliage density and available soil water for data collected at the USDA-ARS Henry A. Wallace Beltsville Agricultural Research hCenter, Beltsville, MD. The ability of each approach to estimate foliage density and the sensitivity of each approach to available soil water are tested.


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