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GLEAMS, Opus, PRZM2ß, and PRZM3 Simulations Compared with Measured Atrazine Runoff

^a USDA-ARS, U.S. Salinity Lab, Soil Physics and Pesticide Research Unit, 450 West Big Springs Rd., Riverside, CA 92507 USA
^b Dep. of Crop and Soil Sciences, Univ. of Georgia, P.O. Box 748, Tifton, GA 31793-0748 USA
^c USDA-ARS Insect Biology and Pest Management Research Unit, Tifton, GA USA
^d USDA-ARS Southeast Watershed Research Unit, P.O. Box 748, Tifton, GA 31793-0748 USA
^e Dep. of Soil and Crop Sciences, Colorado State Univ., Fort Collins, CO 80524 USA
^f USDA-ARS National Grain Insect Research Lab., Brookings, SD 57006-9803 USA

View larger version (24K): [in a new window]   Fig. 1 Daily natural rainfalls for the experimental site for 1992 and 1993

View larger version (62K): [in a new window]   Fig. 2 Measured and predicted surface water runoff by GLEAMS, Opus, and PRZM3 models during 2 yr of corn growing seasons from two mesoplots on the Tifton loamy sand from 1992 to 1993

View larger version (41K): [in a new window]   Fig. 3 Effects of the `special actions' options on surface water runoff predictions by PRZM3

View larger version (38K): [in a new window]   Fig. 4 Measured and predicted atrazine concentrations in runoff solution by GLEAMS, Opus, PRZM2ß and PRZM3 during 2 yr of corn growing seasons from two mesoplots on the Tifton loamy sand from 1992 to 1993

View larger version (34K): [in a new window]   Fig. 5 Measured and predicted atrazine mass losses in runoff solution by GLEAMS, Opus, PRZM2ß and PRZM3 during 2 yr of corn growing seasons from two mesoplots on the Tifton loamy sand from 1992 to 1993

View larger version (45K): [in a new window]   Fig. 6 Measured and Opus-predicted atrazine concentrations in runoff solution with equilibrium adsorption submodel as compared with uncalibrated and calibrated kinetic sorption submodel