1. University of Nebraska-Lincoln, Dept. of Agronomy & Horticulture, 402 West State Farm Rd., North Platte, NE 69101, US
2. University of Nebraska-Lincoln, Biological Systems Engineering Dept., 204 L. W. Chase Hall, Lincoln, NE 68583, US
3. College of Agricultural Sciences–Sao Paulo State University, Rural Engineering Dept., 3780 Avenida Universitaria, Botucatu, Sao Paulo, 18610-034, BR
4. USDA ARS Aerial Application Technology Research Unit, 3103 F&B Rd., College Station, TX 77845, US