WinAPEX is a whole farm (small watershed) production-risk management model designed to help agricultural practitioners optimize crop management and maximize production and profit, to identify limitations to crop yield, and to identify best management practices that minimize the impact of agriculture on soil erosion and water quality at the farm and field level. It is a windows-based application of the APEX (Agricultural Policy/ Environmental extender) model originally developed by the Texas Agricultural Experiment Station that simulates the interaction of natural resources (soil, water, climate) and crop management practices to estimate impacts on harvested crop yield, soil properties, soil erosion, profitability, and nutrient/pesticide fate on a whole farm scale.

WinAPEX is currently distributed on CD-ROM. It operates under Windows® 2000, and XP with 128 MB RAM and requires 250 to 500 MB of space on the hard drive for installation and operation. Information for basic model operation is organized in databases by agricultural region. The databases contain basic information for model operation, but the user can fully customize to simulate his/her conditions and needs. Databases can be constructed for most agricultural regions in the U.S.