Oklahoma State University

CMLS98B Purpose

Purpose | Processes and Assumptions | Installation | Use | Example | References | Acknowledgements
Program Structure | Platform Dependencies | File Structures


CMLS (Nofziger and Hornsby, 1986, 1987) was written to provide a tool for managing agricultural chemicals. The interactive program was written in a manner which is easy to use. The software includes graphical output to aid in understanding and comparing simulated movement and fate of chemicals. The model was designed to use soil and chemical parameters which are readily available. The model is being used widely, especially in educational settings. Recently, it has been compared with experimental measurements and with other models with good results (Pennell et al., 1990; Nofziger et al., 1994). Because the model requires only basic soil properties which are readily available or easily estimated, the model has been used for evaluating the impact of pesticides on large areas. A batch program using the computational algorithms of CMLS was developed and interfaced with geographic information systems (Zhang et al., 1990; Ma, 1993). This batch program facilitated simulation for many soils and chemicals with minimal user effort.

Since CMLS was released in 1985, we have discovered improvements which are needed. The improvements incorporated into a new interactive software system called CMLS94 include (1) functions for estimating daily infiltration and evapotranspiration from daily weather records, (2) irrigation routines, (3) a stochastic weather generator, WGEN, (4) Monte Carlo simulation using different weather sequences at a particular site, (5) an improved user interface, (6) expanded graphics options and increased resolution, and (7) database management features. The software described in this manual is CMLS98B, a batch version of CMLS94. It includes the computational algorithms used in CMLS94 without the interactive features used to define soil - chemical - management systems, to select and display graphs and reports of simulated results, to manage data-bases, and to display on-line help.

CMLS94 and CMLS98B form a working pair of programs. We think persons will want to use the interactive CMLS94 to become familiar with chemical movement and the influence of soils, chemicals, management, and weather on this movement. Many users will find the interactive software adequate for all their studies. Scientists may find CMLS98B useful for larger-scale studies. It can be easily used with geographic information systems for drawing maps of chemical movement and fate.

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