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ARS Home » Research » Publications at this Location » Publication #116922
Title: INTEGRATION OF REMOTELY SENSED DATA WITH CERES-WHEAT

Author
item BARNES, EDWARD
item PINTER JR, PAUL

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 10/23/2000
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Many crop simulation models such as CERES-Wheat, provide reasonable temporal predictions of crop response to average initial field conditions, dynamic meteorology, and varying agricultural inputs but lack direct mechanisms which account for within-field spatial variations in water and nutrient availability that are needed for precision farming applications. The objective of this study was to evaluate modifications made to CERES-Wheat to accept remotely sensed estimates of fractionally absorbed photosynthetically active radiation (fAPAR) and crop water status via the crop water stress index (CWSI). Accuracy was evaluated using data collected during the Free Air Carbon Dioxide Enhancement (FACE) wheat experiments conducted at the Maricopa Agricultural Center in Arizona. The fAPAR modification improved model predictions of biomass in N stressed plots without explicit input to the model regarding fertilizer application. It was possible to obtain reasonable yield predictions of water stressed plots using only CWSI measurements during the season to indicate inadequate plant available water. The fAPAR modifications should be helpful in allowing CERES-Wheat account for season long stress, while the CWSI modifications should provide a fairly dynamic feedback mechanism for acute water stress situations.