Abstract #301948

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JSM 2003 Abstract #301948
Activity Number: 49
Type: Contributed
Date/Time: Sunday, August 3, 2003 : 4:00 PM to 5:50 PM
Sponsor: Section on Statistics & the Environment
Abstract - #301948
Title: Nonparametric Modeling of Soil Characteristics for Crop Models
Author(s): Stephan R. Sain*+ and Douglas W. Nychka
Companies: University of Colorado, Denver and National Center of Atmospheric Research
Address: PO Box 173364, Denver, CO, 80217-3364,
Keywords:
Abstract:

Deterministic models that predict yields for various agricultural crops require a number of inputs. One class of inputs is the water-holding characteristics of the soil. These characteristics are not extensively measured, although other soil characteristics such as the composition (percentage of sand, clay, and silt) are widely known. We develop an additive model based on a thin-plate spline estimate to estimate water holding characteristics. The impact of such estimates on predicted yields will be considered. Further, impacts of the hetereogenity in the soil at a specific location as well as across a region will also be examined.

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