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AEPAT

Software for Assessing Agronomic and Environmental Performance of Management Practices in Long-Term Agroecosystem Experiments

^a USDA-ARS, Northern Great Plains Res. Lab., P.O. Box 459, Mandan, ND 58554-0459
^b 4800 Calhoun Rd. Dep. of Comput. Sci., Univ. of Houston, Houston, TX 77204-3010
^c USDA-ARS, Soil and Water Conserv. Res. Unit, 119 Keim Hall, Dep. of Agron., Univ. of Nebraska, Lincoln, NE 68583-0934

View larger version (86K): [in a new window]   Fig. 1. Input file screen for AEPAT. First-time users may select an indicator file installed with the program (SampleData.csv).

View larger version (86K): [in a new window]   Fig. 2. Screen for assigning indicators to functions. In this screen, grain yield and grain N content are assigned to food production, and residual soil nitrate and soil pH are assigned to nutrient cycling.

View larger version (97K): [in a new window]   Fig. 3. Screen for describing indicators. For soil pH, a threshold value is selected using a sigmoidal scoring function. Lower and upper bounds as well as inflection points are selected by the user. The slope of the curve is generated by clicking the Auto-Calculate Slopes button.

View larger version (81K): [in a new window]   Fig. 4. Screen for assigning weights to agroecosystem functions and indicators.

View larger version (109K): [in a new window]   Fig. 5. Output screen displaying calculated scores for indicators, agroecosystem functions, and overall performance. Results are presented in a table and bar graph.

View larger version (25K): [in a new window]   Fig. 6. An agricultural sustainability hierarchy (adapted from Andrews, 1998). Evaluations with AEPAT are representative of the middle level of the hierarchy.