COSSMO: A Combination of Crop Growth and Water Management Modeling System
Perry, Calvin D.
Thomas, Daniel L.
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Controlled-drainage/subirrigation (CDSI) is a management scheme by which the water table below the crop root zone is managed (by adding or removing water) to provide an optimum soil water environment. Since crop growth is affected by water management strategies, a method is needed to predict the crop response to these various strategies. Improper management can lead to plant injury by allowing either too much or too little water to reach the plant's roots, thereby reducing yields. The water management model DRAINMOD (Skaggs, 1978) was developed as a design and management tool for use with CDSI systems in humid regions. A limiting aspect of DRAINMOD is the inability to simulate crop growth directly. In order to determine the potential benefits of managing soil water conditions with a CDSI system, a method for evaluating the effects of various irrigation strategies on crop growth is needed. Many efforts have been made to enable DRAINMOD to simulate crop growth (Sabbagh et al., 1991; Brink, 1986; Evans, 1991). This presentation describes an attempt to add crop growth capabilities to DRAINMOD by developing an "expert simulation system", COSSMO (COmbined Subirrigated Soybean MOdel), to link DRAINMOD with the crop growth model SOYGRO. This presentation also indicates the results of validating the COSSMO system with soil, weather data, and observed yields from studies in North Carolina. Simulation results from COSSMO are also compared to simulation results from SOYGRO stand-alone.