GWM: General weed management model

GWM is a decision support system designed for evaluating soil-applied and post-emergence weed management options in row crops. It has a general structure to allow use with different crops. The system consists of a simulation model, databases, and a database management module. The simulation model has a set structure for linking processes of weed population dynamics during a single season, but allows flexibility in how each process is modeled Databases store model parameters, information about management options, and field-specific simulation inputs. The database management module allows a user to specify entirely the simulation model or modify existing versions without programming. GWM has been parameterized to evaluate weed management as in two existing models (WEEDSIM and WEEDCAM) and for dry bean production. The structure of GWM and associated databases appears to capture essential aspects of weed biology influencing management decisions. GWM can be enhanced as knowledge of weed biology and ecology is refined.