AGDISP Sensitivity to Crop Canopy Characterization

by

W. Clint Hoffmann

Contact: Clint Hoffmann  email:  choffmann@tamu.edu

Summary:

Recent studies have suggested that the AGDISP Spray Model is very sensitive to the canopy characteristics that are input into the model.  A series of studies at progressive crop heights were conducted to correlate field deposition and spray movement results with AGDISP model predictions.   For each replication of the test, horizontal deposition was measured using mylar and water-sensitive cards and the airborne component of the spray at 50 m (167 ft) was measured with monofilament line suspended at four heights.  The results show that varying crop characteristics have less influence on field deposition and airborne deposits than predicted by the model.  By better understanding the role of the various inputs into computer models, users of these models can make more informed decisions about how to set up the model and interpret the results.

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